Rolls-Royce Archives
| Identifier | Entry | ||
| scan0001 | Starter motor with a sliding armature. | ||
| View original record | 7625 RR 68 (250T) (DB 925 8-5-25) J.H.D. STARTER MOTOR WITH SLIDING ARMATURE. | ||
| scan0002 | Proposed scheme for a sequence starter unit, including a diagram and operational breakdown. | ||
| View original record | To EFC. from R. c. to BJ. RL/M22.9.26. X7625A X 7625A SEQUENCE STARTER X.7625. X.7620. X 7655. In rearranging this unit we have considered the following scheme which is shewn diagrammatically… | ||
| scan0003 | Request for performance data on a starter motor's armature, specifically its end pull characteristics. | ||
| View original record | -2- Contd. (A) What is the end pull of the existing starter motor armature by teazer circuit magnetisation from one inch out to normal position, when the pull falls to nothing. We believe the curve… | ||
| scan0004 | Test results for a Sequence Starter, focusing on armature pull, windings, and current draw. | ||
| View original record | To R. from EFC. c. BJ. AJS. X7625 A EFC2/T1.10.26 X.7625A SEQUENCE STARTER. X.7620 We have now completed the tests asked for in your RL/M22.9.26. and attached please find a photostat copy of curves… | ||
| scan0005 | Continued memorandum discussing ampere turns, current draw, and frictional effects in an electrical motor or actuator. | ||
| View original record | Contd. -2- EFC2/T1.10.26. and the turns 36. This would be the equivalent of 17 amperes in the present case, using the actuator box and 25 amperes; not using it, i.e. to 510 and 750 ampere turns… | ||
| scan0006 | Graph of curves showing the force exerted on the armature by the field axially for Starter Motor A. | ||
| View original record | STARTER MOTOR A CURVES SHOWING FORCE EXERTED ON THE ARMATURE BY THE FIELD AXIALLY. LOAD (lbs wt) 18 16 14 12 10 8 6 4 2 0 DISTANCE OUT FROM ZERO (inches). .250 .500 .750 1.000 1.250 25 amperes. 20… | ||
| scan0007 | Redesign of a starter motor for an EAC chassis, proposing the elimination of the epicyclic reduction gear. | ||
| View original record | x7625 To EFC. from AJS. c. BJ. EY. HS. AJS1/M9.11.26. X.7625 (struck through) SEQUENCE STARTER+ X.7620. In redesigning this starter for EAC. chassis we shall endeavour to eliminate the epicyclic… | ||
| scan0008 | Performance characteristics, stalling conditions, and heat-up times for EAC motors used in a sequence starter. | ||
| View original record | X7625 To AJS. from EFC. c. to BJ. BY. EFC1/T13.11.26. X.7625 SEQUENCE STARTER X. 7620. Answering the first portion of your AJS1/M9.11.26, please find attached a curve of the average torque-speed… | ||
| scan0009 | Modifications to the New Phantom starter motor for improved torque and efficiency. | ||
| View original record | To AJS. from EFC. c. RJ. BY. X.7625 EFC/T27.11.26. X 7625 RE SEQUENCE STARTER. X7620 We regret we have not been able in our previous note to give you the complete information asked for in your NK… | ||
| scan0010 | Continued discussion on motor design, efficiency, and experiments on the Phantom motor. | ||
| View original record | Contd. -2- EFC/T27.11.26. copies of our calculations in this connection sometime early next week. We do not at the moment see any reason for any other alteration to the design of the motor than the… | ||
| scan0011 | Sending a re-designed starter motor and a request for private handling of internal correspondence. | ||
| View original record | TO EFC. FROM AJS. X7625 AJS1/M30.11.26. RECEIVED Thank you for your EFC1/T271126. We expect to be sending the re-designed starter motor in the course of a day or so. I should be very glad if any… | ||
| scan0012 | Drawing for a Phantom direct drive starter motor and its placement. | ||
| View original record | TO BY, FROM AJS. C. to - BJ. HS. EFC. ORIGINAL x7625 PHANTOM STARTER MOTOR. x.7625 RECEIVED We send you herewith drawing LeC.2330., shewing Phantom direct drive 13 to 1 ratio starter motor, the… | ||
| scan0013 | Proposal to use brushes similar to the Phantom dynamo for the EAC.7 starter motor. | ||
| View original record | To EFC. from AJS. c. to EY. X7625 AJS3/M24.12.26. EAC.7 STARTER MOTOR. X.7625. In regard to starter motor for EAC.7. on LeC.2330., EY. has suggested that we use similar section brushes to the narrow… | ||
| scan0014 | Copy of a telegram regarding the arrangement of turns on the poles of a new starter motor. | ||
| View original record | X7625 COPY OF TELEGRAM RECEIVED FROM AJS.(W.W.) 4.1.27. CLARK ROYCAR DERBY. CAN ARRANGE 3½ TURNS ON 3 POLES AND 3 TURNS ON FOURTH OF NEW STARTER MOTOR IS THIS O.K. STENT. | ||
| scan0015 | Responding to a telegram about the status of starter motor X.7625. | ||
| View original record | To AJS. from EFC. X7625 EFCs/T4.1.27. RE STARTER MOTOR. X.7625. With reference to your telegram of to-day, re starter motor; yes, this is O,K. EFC. | ||
| scan0016 | Request for a Phantom starter motor carcase to serve as a model due to difficulties with terminal arrangements. | ||
| View original record | EFC. from AJS. X.7625 AJS6/M5.1.27. We should be glad if you would kindly forward (by return if possible) a Phantom starter motor (on engine type) carcase, with pole pieces, field coils, and terminals… | ||
| scan0017 | Cost savings of using similar brush holder parts versus the technical efficiency of narrower brushes for a starter motor. | ||
| View original record | X7625 To AJS. from EFC. EFC4/T5.1.27. EAC.7 STARTER MOTOR Answering your AJS3/M24.12.26, I understand the main object of the suggestion is to enable similar brush holder parts to be used, thus… | ||
| scan0018 | Requesting confirmation on the winding specifications for a new Phantom starter motor, including the number of turns and conductor size. | ||
| View original record | To EFC. from AJS. X7625 AJS7/M5.1.27. c. to EY. We wired you yesterday as follows - "CAN ARRANGE THREE AND A HALF TURNS ON THREE POLES AND THESE TURNS ON FOURTH OF NEW STARTER MOTOR IS THIS OK. STENT"… | ||
| scan0019 | New Phantom Sequence Starter No. 2 scheme for a car going to Le Canadel. | ||
| View original record | X7625 To AJS. from EFC. c. BY/RD. EFC4/T6.1.27. X7625 PHANTOM SEQUENCE STARTER, NO. 2 SCHEME. Y7655 It is understood that Mr. Royce is desirous of having this new sequence starter scheme on a car that… | ||
| scan0020 | Sketch detailing the scheme, number of turns, and conductor size for a Phantom starter motor. | ||
| View original record | To R. from AJS. c. to BJ. EFC. X625 AJS1/M6.1.27. PHANTOM STARTER MOTOR. Below we give a sketch indicating the scheme which seems to work in best. Please note the number of main field turns, and size… | ||
| scan0021 | Specifications for a Phantom starter motor carcase and winding. | ||
| View original record | To AJS. from EFC. c. RHC. X7625 EFC2/T7.1.27. SEQUENCE STARTER MOTOR. With reference to your AJS6/M5.1.27, we are, as requested, despatching to you to-day a Phantom starter motor carcase. Re the query… | ||
| scan0022 | The despatch of a Phantom starter motor carcase for inspection. | ||
| View original record | X7625 To Wd. from EFC. c. Despatch Stores. EFC4/T7.1.27. PHANTOM STARTER MOTOR CARCASE. We are sending into the Stores one Phantom starter motor carcase. Would you kindly give instructions for this to… | ||
| scan0023 | Design modifications for the Phantom Sequence Starter No.2, including changes to the carcase and windings. | ||
| View original record | X7625 AJS1/M8.1.27. To EFC. from AJS. c. to R. BJ. BY. PHANTOM SEQUENCE STARTER No.2. SCHEME. X X.7625. In reply to your EFC4/T6.1.27., we expect to be able to forward to BY. on Monday next the… | ||
| scan0024 | Modifications to the Phantom starter motor windings regarding carcase length and conductor splitting. | ||
| View original record | TO BY. BPC. FROM AJS. C. to -DJ- HS. X7625 Hs AJS3/M11.1.27. RECEIVED JAN 12 1927 PHANTOM STARTER MOTOR - 13.1 REDUCTION. We send herewith (to BY.) LeC. 2365. - Main Field Windings of above. We have… | ||
| scan0025 | Return of an incorrect starter motor carcase which was missing its field coils. | ||
| View original record | To EFC, from AJS. X7625 AJS4/M11.1.27. STARTER MOTOR We received the starter motor carcase, but my request was for one containing field coils, which the one received did not contain. We are therefore… | ||
| scan0026 | New parts and winding modifications for a sequence starter motor. | ||
| View original record | To REG. C. EFC. X/625 BY/RD2/ML.25.1.27. RE EAC.V11 - SEQUENCE STARTER MOTOR. Lec.2365. SCH.2 - SEC:8030. Hs RECEIVED JAN 08 1927 Hs RECEIVED JAN 21 1927 Please receive herewith prints of the… | ||
| scan0027 | Design progress of a new automatic switch unit for a starter motor. | ||
| View original record | X7625 To EY. from AJS. c. to EFC. AJS1/M27.1.27. X 7625 EAC.7. STARTER MOTOR. X.7655 X.7650. X.7626. Replying to your HY12/H25127, we have almost completed the design for the new automatic switch unit… | ||
| scan0028 | Use of a duplex push button switch for the No.2 Sequence Starter scheme. | ||
| View original record | To AJS, from EFC. c. EY. HY/HD. X7625 EFCG/T3. 2. 27. X7650 X7625 X7625 SEQUENCE STARTER No.2. SCHEME. Reference your AJS/MS7.1.27, third paragraph. I do not think we ought to use, as you suggest, the… | ||
| scan0029 | Elimination of faults in a pinion operated switch by applying the No. 2 scheme. | ||
| View original record | Contd. -2- EFC3/T3.2.27. and pinion operated switch. These faults we hope will be largely eliminated by the application of the lower portion of the No.2. scheme. EFC. | ||
| scan0030 | List of required prints for the details of an E.A.C.V11 Sequence Starter Motor. | ||
| View original record | X7625 BY/RD4/ML4.2.27. C. EFC. E.A.C.V11 SEQUENCE STARTER MOTOR. L.C.2330. SEC:8010. Please receive herewith prints of the details required for the Bearing Brackets, Brush Gear and Connections for the… | ||
| scan0031 | The inaccessible design of the sliding armature starter motor for the E.A.C. V11 Chassis. | ||
| View original record | x9621- To. Eac. C. EFC. BY/RD5/ML.4.2.27. E.A.C.V11 - STARTER MOTOR. We have now instructed the Sliding armature type motor for the E.A.C. V11 Chassis and are aware of its inaccessibility in all… | ||
| scan0032 | Inaccessibility of a sliding armature type motor for the Sequence Starter No.2 Scheme. | ||
| View original record | To AJS. from EFC. X7625 EFC3/T4.2.27. SEQUENCE STARTER NO.2 SCHEME. The D.O. electrical section point out the inaccessibility of the sliding armature type motor for this purpose. They refer to "its… | ||
| scan0033 | The inaccessibility of the sliding armature starter motor for the E.A.C. V11 Chassis. | ||
| View original record | X7625 To Hs. C. EFC. BY/RD5/ML4.2.27. E.A.C.V1l - STARTER MOTOR. We have now instructed the Sliding armature type motor for the E.A.C. Vll Chassis and are aware of its inaccessibility in all respects,… | ||
| scan0034 | List of parts required for a starter motor armature, noting that mouldings can be made in ebonite for an experiment. | ||
| View original record | X7625 TO R.M.C. C. EFC. BY/RD1/ML8.2.27. E.A.C.V11. STARTER MOTOR. SEC:8000. L.C.2330. Please receive herewith prints of the following details required for the armature; the parts called for as… | ||
| scan0035 | Responding to criticism about starter motor bearing lubrication, proposing the addition of an oil hole with an accompanying sketch. | ||
| View original record | Y7625 To BY. from AJS. c. to EFC. AJS2/M11.2.27. EAC.7. STARTER MOTOR (SLIDING ARMATURE) X.7625. In reference to BY/RD's criticisms in BY/RD3/ML 3.2.27., we always welcome comments of this kind, and… | ||
| scan0036 | Assembly hindrances and suggesting design modifications for a vehicle component. | ||
| View original record | Contd. AJS2/M11.2.27. (2) We presume the hindrance to assembly referred to under this item is due to the position of the screws securing the end unit, and if this is all that requires altering we… | ||
| scan0037 | Difficulties of starter motor placement and its potential future use with a new gearbox. | ||
| View original record | Driver: Remarks on the running generally: -3- Contd. 6. R. realised the difficulties of taking down the starter motor etc. He considered that in view of the very rare occasions when it should be… | ||
| scan0038 | Proposal for temporarily wiring a new sliding armature sequence starter motor to a chassis. | ||
| View original record | TO RHC C. EFC. C. EF/HJR x7625 BY/RD1/ML10.2.27. Hs RECEIVED 10 XII I 1927 E.A.C.Vl1 - SEQUENCE STARTER. In order to get the new (sliding armature) starter motor working on a chassis as soon as… | ||
| scan0039 | Design of an automatic switch unit for a Phantom direct flywheel geared starter. | ||
| View original record | TO AJS. HS. EFC. E. FROM R. (At Le Canadel.) C. to BJ WOR BY ORIGINAL R1/M10.3.27. REC'D & DESPATCHED FROM WW.14.3.27. Handwritten: Y7623 X.7.655. PHANTOM - DIRECT FLYWHEEL GEARED STARTER - AUTO:… | ||
| scan0040 | Design notes and sketches for an electrical magnet component. | ||
| View original record | (2) Do not let connections depend on pressure on insulations. Speaking generally I should prefer to fix the base to the chassis and then make the wire connections at the front, and then put the cover… | ||
| scan0041 | Resistance measurements for the field windings of a new sequence starter motor (No. 2 Scheme, Designated J). | ||
| View original record | X7625 17.3.27. RESISTANCES OF FIELD WINDINGS OF NEW SEQUENCE STARTER MOTOR (No.2.SCHEME). (DESIGNATED J). Teazer :- 16°C Volts. (42) Amps. (42) Ohms. .182 .481 .379 .275 .731 .376 .366 .980 .374… | ||
| scan0042 | Issues with a new sequence starter motor (Scheme No.2), specifically the armature reaction effect from having too few turns in the main field winding. | ||
| View original record | To RHC. from EFC. c. BY/RD. x7625 EFC5/T27.4.27. X.7625. SEQUENCE STARTER MOTOR ( SCHEME No.2) This motor has been instructed and assembled with three turns per pole to constitute the main field… | ||
| scan0043 | Requesting the procurement of a modified switch spring for the Sequence Starter Motor No. 2 scheme. | ||
| View original record | X16215 To BY/RD. from EFC. EFC4/T30.4.27. SEQUENCE STARTER MOTOR NO. 2. SCHEME. SWITCH FLEXIBLE SPRING. The characteristics of this spring are not considered to be satisfactory for the purpose to… | ||
| scan0044 | New 'RR sequence' starter motor system for the Phantom. | ||
| View original record | S E C R E T To BJ. from R. c. OY. EFC½ HS. [Handwritten and crossed out: X7625] R3/M2.5.27. PHANTOM STARTER. X.7655½ X.7625. EAC.7. is being fitted with a new starter motor system termed "RR sequence"… | ||
| scan0045 | Advantages of a nearly silent, flywheel geared type mechanism. | ||
| View original record | Contd. -8- R3/M2.5.27. We believe in this form it will be equal or superior to all others we know of. It is of the flywheel geared type, and that is one of the reasons for getting it out of gear and… | ||
| scan0046 | Request to test a new Plunger Spring (D.71355) for a starter motor to improve the switch operation. | ||
| View original record | X7625 C. EFC. BY/RD4/VL.3.5.27. E.A.C.V11 - STARTER MOTOR. ARMATURE. SEC: 8000. Please receive herewith blueprint of D.71355 - Plunger Spring - an alternative to D.71328. This has been added to L.O.P.… | ||
| scan0047 | The state and development of a sequence starter unit, discussing testing a direct drive version without the automatic stopping device. | ||
| View original record | TO EFC. } FROM R. -HS- C.c to BJ. WOR. XDS X7625 R2/M3.5.27. 7625 re. SEQUENCE STARTER FOR EAC. 7. X7655 RECEIVED The state of this unit is I believe as follows You have all the particulars for the… | ||
| scan0048 | Preliminary trouble with a sequence starter motor, detailing issues with the armature engagement. | ||
| View original record | To R. from EFC. c. BJ. X7625 EFC4/T7.5.27. X7625 SEQUENCE STARTER - R2/M3.5.27. X7650 The sequence starter has been arranged on a car with the combined main and relay switch unit and duplex push… | ||
| scan0049 | Modification to the No.2 scheme sequence starter motor's field windings. | ||
| View original record | To RHC. from EFC. c. BY/RD Y7625 EFC2/T9.5.27. SEQUENCE STARTER MOTOR - No.2. SCHEME. As at present arranged this motor will not draw into gear satisfactorily. To attempt to make it do so we require… | ||
| scan0050 | Bench test results for a sequence starter motor (No. 2 scheme). | ||
| View original record | X 7625 10.5.27. R.R. SEQUENCE STARTER (NO.2. SCHEME) MOTOR. BENCH TEST. (1) Teazer terminal to + brush. Amperes = 26.0 Overall volts 10.4 Volt drop on teazer winding 10.0 " " " main .4 ------ 10.4 (2)… | ||
| scan0051 | Bench test results for a post-war R. Bosch starter motor. | ||
| View original record | 10.5.27. R. BOSCH STARTER MOTOR (POST WAR) BENCH TEST. (1) Terminal 50 to + brush½ Amperes 29.0 Overall voltage 10.5 Voltage drop on solenoid coil 1.7 Voltage drop on auxiliary field coil 8.8 Current… | ||
| scan0052 | Arrangement and advantages of a No. 2 scheme sequence starter. | ||
| View original record | To R. from EFC. c. BJ. [Handwritten: X7625-A] [Handwritten: X7655A] [Handwritten: X2650] EFC1/T10.5.27. X.7625.A SEQUENCE STARTER. Further to our EFC4/T7.5.27, and in more detailed answer to your… | ||
| scan0053 | Faults and test results for a motor's pinion and flywheel engagement system. | ||
| View original record | -2- Contd. teazer terminal to the carcase in the first instance, and from the teazer terminal to positive brush (to prevent the current going through the armature) in the second instance. On a… | ||
| scan0054 | Technical analysis and comparison of a motor unit's design against a post-war Bosch motor. | ||
| View original record | -3- Contd. than in the other case. It would appear that the difficulty in the design of this unit is to produce sufficient magnetic flux to set up a large longitudinal pull without at the same time… | ||
| scan0055 | Comparative analysis of a Bosch motor's electrical and mechanical characteristics against an existing design, page 4. | ||
| View original record | EFC1/T10.5.27. -4- Contd. occupied by the teazer winding on each of the two poles being larger than the space occupied by the main winding on the other two poles. Further, the electrical connections… | ||
| scan0056 | Report page discussing modifications and experiments on an electric motor, focusing on the armature and teazer winding. | ||
| View original record | -5- Contd. range, when tried on the bench with a battery. Our machine does not go definitely in. It would appear that there is still some longitudinal pull on the Bosch armature when it is right up… | ||
| scan0057 | Continued discussion on motor trials, focusing on armature rotation, helix angle, and a comparison with a Bosch motor. | ||
| View original record | -6- Contd. see what other trials to make. but if we have any means of suppressing the rotation of the armature by bye-passing some of the armature current though still leaving a small turning effect… | ||
| scan0058 | Modification to a sequence starter motor for experimental demonstration to Mr. Royce. | ||
| View original record | Y7625 To RHC. from EFC. c. BY/RD. EFC2/T10.5.27 SEQUENCE STARTER MOTOR - NO.2. SCHEME. Further to our EFC2/T9.5.27, we wish to modify this instruction in such a manner that the negative end of the… | ||
| scan0059 | Specification sheet and connection diagram for Motor J, No 2 scheme. | ||
| View original record | 5A X.7620. RR. S.S.M. 11th May, 1927. Motor J. No 2 scheme Air gap .012" or .3 mm. Field winding M .1.75" x .080" section. = .0140 (Cond. dimensions) T. 17 SWG. Resistance T. .38 w 18oC M. .015 w… | ||
| scan0060 | Proposed modifications to improve the end motion vigour of a starter motor, model EAC.7. | ||
| View original record | TO EFC.) FROM R. HS.) C. to BJ. WOR. BY F re. STARTER MOTOR FOR EAC.7. TO IMPROVE VIGOUR OF END MOTION. SPRING. To enable this to move better endwise I have suggested that we reduce the spring to 66%… | ||
| scan0061 | Scheme and proposed modifications for the Sequence Starter Motor No.2. | ||
| View original record | To R. from EFC. c. BJ. Wor. c. E. BY. EFC3/T18.5.27. SEQUENCE STARTER MOTOR NO.2. SCHEME. Your ref. R1/M16.5.27. In the first instance we are arranging for firstly the alteration in the spring,… | ||
| scan0062 | Instructions for alterations to the Sequence Starter Motor No. 2 scheme. | ||
| View original record | X2625 To BY/RD. from EFC. c. BY. RHC. EFC4/T18.5.27. SEQUENCE STARTER MOTOR NO.2 SCHEME. In regard to RL/M16.5.27 and EFC3/T18.5.27, would you please instruct the following alterations :- (1) Main… | ||
| scan0063 | Modifications and test results for the Sequence Starter Motor No. 2 scheme. | ||
| View original record | X7625 To R. from EFC. c. BJ. EFC5/T24.5.27. SEQUENCE STARTER MOTOR NO.2. SCHEME. Further to our EFC3/T18.5.27, to get an increase of .050" of air gap from .0125" to .0625" in the travel of .800"… | ||
| scan0064 | Armature diameter for a motor, suggesting it should be the same as a 20 HP motor. | ||
| View original record | -2- Contd. Therefore it appears to us that our armature diameter for this motor should be about the same as that for the 20 HP., viz. 2.850, giving a ratio of .57 , which suggests that a 20 HP.… | ||
| scan0065 | Instructions for modifying a sliding armature starter motor to have a taper bore and weaker spring. | ||
| View original record | X2625 To EFC. BY/RD5/ML26.5.27. STARTER MOTOR (SLIDING ARMATURE). I have now given RHC (BY/RD4/ML26.5.27) all the necessary instructions to modify the existing motor to have taper bore, .250 out of… | ||
| scan0066 | Overhauling of calculations for a sequence starter motor scheme, number 2. | ||
| View original record | To R. from EFC. c. BJ. X762 EFCl/T28.5.27. SEQUENCE STARTER MOTOR NO.2. SCHEME. Further to our EFC6/T24.5.27, we are overhauling our calculations for the sequence motor in the light of the utilisation… | ||
| scan0067 | Performance issues and redesign efforts for a sequence starter motor. | ||
| View original record | To R. from EFC. c. BJ. X7625 EFC4/T2.6.27. X.7625. SEQUENCE STARTER MOTOR NO. 2. SCHEME. The reduction through which this 5" dia. motor was originally arranged to drive the engine was 30 : 1, and all… | ||
| scan0068 | The design and testing of a starter motor, suggesting changes to the armature and field winding. | ||
| View original record | -2- Contd. Where conditions are very much easier, as in the case of the 20 HP. starter motor (only ¼" smaller in carcase dia. and no teazer winding) it was not/difficult matter to arrange the… | ||
| scan0069 | Technical memorandum discussing motor torque, ampere turns, and armature dimensions. | ||
| View original record | -3- Contd. (3) We use punched plated and no mica. (An experiment sometime ago on one of our 6" motors arranged like this showed very good results on brake test). A copy of a set of calculations is… | ||
| scan0070 | Proposal for a new armature design and testing for a motor's longitudinal engagement. | ||
| View original record | -4- Contd. longitudinal engagement. In this connection we have now decided that the Bosch motor referred to, which has a similar carcase dia. but smaller armature dia., and which has 31 slots of only… | ||
| scan0071 | Manufacturing process for milling slots in a tapered armature. | ||
| View original record | -5- Contd. which to learn something, and necessarily we have to produce something more like what we think the final motor is going to be. This memo contains our proposition to that end. The query… | ||
| scan0072 | Calculations for a sequence starter motor for a Phantom engine with a 13:1 ratio. | ||
| View original record | EFC/T1.6.27. X.7624. SEQUENCE STARTER MOTOR. (To start Phantom Engine with 13 : 1 ratio). Maximum normal torque required to turn Phantom Engine = 1100 lb-inches. Taking 85% gearing efficiency,… | ||
| scan0073 | Calculations for armature design, conductor count, and back E.M.F. of an electric motor. | ||
| View original record | -2- Contd. Assume a useful polar flux density of 6750 lines per cm² reckoned on the minimum pole face. Armature diameter 3.100" Armature circumference corresponding to 69% polar embrace = (69/400) x π… | ||
| scan0074 | Calculations for motor resistance, including armature and field resistance at 20°C. | ||
| View original record | -3- Contd. Forward terminal P.D. = 8.68 volts. Hence E.M.F. to overcome ohmic resistance = 5.14 volts. Amperes = 166 Total motor ohms = .031 = R (say) Let field resistance = R_F and armature " = R_A… | ||
| scan0075 | Page of calculations for armature dimensions and copper wire properties. | ||
| View original record | -4- Contd. But ohms of copper per 1000' at 20°C = .00815 ÷ cross sectional area in sq.inches. Whence a = .00815 / 1.22 sq. inches. = .00668 sq. inches. i.e. 13 S.W.G. dia. .092" By comparison with 20… | ||
| scan0076 | Page of calculations for motor design, covering armature teeth, ampere-turns, and field resistance. | ||
| View original record | -5- Width of tooth one quarter of the way up = .095 + 1/4 of .093 = .115" say. (Here see table p.6). In the ampere-turn estimation table, the figures for the armature teeth can vary enormously owing… | ||
| scan0077 | Calculation table for the ampere-turns necessary to produce the required magnetic flux in various components. | ||
| View original record | -6- AMPERE TURNS NECESSARY TO PRODUCE FLUX REQUIRED. | Part. | Matl. | Length. (") | Virtual section (sq.ins) | Total flux. | Flux density. Inch units. | Flux density. Cm. units. | H. | AT. per inch.… | ||
| scan0078 | Diagram showing the detail of an armature slot and winding. | ||
| View original record | D71371 VARNISH .010 SLOT LINER 13. S.W.G (.092 DIA) D.C.C. DIA OVER INSULATION = .102 .005 TAPE 1/2 LAP .148 RAD. .480 +.010 ARM. DIA = 3.100 Nº OF SLOTS = 29 NO BANDING WIRE ON ARM. CORE Alins 1-6-27… | ||
| scan0079 | Potential design improvements for the No.2 Sequence Starter Motor, focusing on increasing its size and efficiency. | ||
| View original record | TO SRO. FROM R. HS. Copy to BJ. WOR. re. SEQUENCE STARTER MOTOR - No.2. SCHEME. Thanks for your suggested winding for the above. It has occurred to me that you might like to lengthen the armature… | ||
| scan0080 | Feasibility of using 5¼ inch or 5½ inch diameter starter motors for the Phantom engine. | ||
| View original record | To BY. from EFC. X7625 EFC10/T10.6.27. X.7625 - SEQUENCE STARTER MOTOR NO.2 SCHEME. Referring to R3/M8.6.27 - last para. - you will see that we are anxious to know whether it will suit the engine… | ||
| scan0081 | The Sequence Starter Motor No.2 scheme, discussing carcase tubing and clearances. | ||
| View original record | X7625 EFC. BY21/H. 15.6.27. SEQUENCE STARTER MOTOR. NO.2. SCHEME. ---e--- Referring to EFC10/T.10.6.27. and R3/M.8.6.27. there is no difficulty in obtaining tube for the carcase of any special… | ||
| scan0082 | The completion of a plunger spring for a starter motor. | ||
| View original record | EFC. X7625 17.6.27. X.7625. PLUNGER SPRING FOR STARTER MOTOR The above, to BYRD'S instruction BY/RD4/ML3.5.27. has been completed by RHC. and was fitted to the starter motor recently sent to R. S.T. | ||
| scan0083 | Calculations for a sequence starter motor designed for a Phantom engine. | ||
| View original record | E.F.C X7625 22.6.27. SEQUENCE STARTER MOTOR. (To start Phantom engine with 16 :1 ratio). Maximum normal torque required to turn Phantom engine assumed to be 1100 lb-inches. Taking 85% gearing… | ||
| scan0084 | Calculations for armature circumference, flux, conductors, and E.M.F. | ||
| View original record | -2- Contd. Armature circumference corresponding to 69% polar embrace = (69 / 400) x π x 3.100 = 1.68 inches or 4.27 cm. Armature length = 2.750" = 6.99 cm. Useful flux per pole = 4.27 x 6.99 x 6500 =… | ||
| scan0085 | Calculations for motor resistance, armature, and slot area. | ||
| View original record | -3- Contd. Total motor ohms = .026 = R Let field resistance = RF and armature " = RA Then R = 1.3 RA + RF to allow for brush and commutator resistance. Suppose RF = .6 RA then R = 1.9 RA or RA = .0137… | ||
| scan0086 | Calculations for motor armature slot and conductor dimensions. | ||
| View original record | -4- Contd. Depth of slot must not exceed = √(#A / 2π) = √.222 = .471" Take slot depth = .390" Then slot width = .080" Width of slot for insulation = .035" (as on 6"motor) Therefore width of conductor… | ||
| scan0087 | Calculations for pitch, ampere turns, and field winding resistance. | ||
| View original record | -5- Contd. Pitch at this diameter = 2.400 x π / 45 = .1675" Width of tooth at root = .0875" " " " one tenth of the way up = .0875" + 1/10 of .0485 = .092" say. (Here see table p.6) Ampere turns… | ||
| scan0088 | Calculation table for Ampere Turns required to produce a specific magnetic flux. | ||
| View original record | -6- AMPERE TURNS NECESSARY TO PRODUCE FLUX REQUIRED. | Part. | Matl. | Length (") | Virtual section (sq.ins) | Total Flux. | Flux density inch. units. | Flux density Cm. Units. | H. | AT. per inch. |… | ||
| scan0089 | Calculations and specifications for winding electrical poles for a component. | ||
| View original record | -7- Contd. The cross sectional area of this strip = .00815 / .985 = .00827" or as much greater than this as space will allow after getting in 36 turns of 17 SWG. teazer winding per pole. Suggest in… | ||
| scan0090 | Requesting advice on fitting a sequence starter to a newer EAC.7 crankcase due to mismatched bolt dimensions. | ||
| View original record | To EFC. c. R C. c. BY/RD. X76289 BY/SS1/DB30.6.27. X.7620. RE EAC.7. SEQUENCE STARTER. EFCL/T22.6.27. Mr. Coverley has raised the question of fitting the first sequence starter to the latest EAC.7.… | ||
| scan0091 | Challenges of fitting a sequence starter to an EAC.7 chassis, proposing to wait for a newer design. | ||
| View original record | X7625A To R. from EFC. c. BY c. BY/SS. c. BY/RD. EFC5/T30.6.27. X7625A EAC.7. SEQUENCE STARTER. X.8650. X.7650. X.7625A The fitting of the No.1 scheme of sequence starter to EAC.7. chassis has, at our… | ||
| scan0092 | The bench test of the No.2A scheme sequence starter motor and subsequent test plans. | ||
| View original record | X7625A To RHC. from EFC. c.c. to BY/RD. EFC4/LG15.7.27. X.7625.A. SEQUENCE STARTER MOTOR. NO. 2A, SCHEME. We have now bench tested this motor on which you put the taper of armature and poles. The… | ||
| scan0093 | List of part numbers for sequence starter motors and gears for two different schemes. | ||
| View original record | X7625 8.8.27. Sequence starter motor. (No.1 scheme). X.7620. Sequence starter gear. (No.1 scheme). X.7650. Sequence starter motor (No.2. scheme - sliding armature). 2A. Inward. X.7625A. 2B. Outward.… | ||
| scan0094 | Specifications and calculations for a sequence starter motor with a tapered armature. | ||
| View original record | X.7625A 8.8.27. X.7625A. SEQUENCE STARTER. No.2A scheme motor as modified to give tapered armature and .250" out of centre in 'in' position :- Max. armature dia. 3.098" Min. " " 3.003" Max. pole "… | ||
| scan0095 | Requesting the rewinding of a faulty Sequence Starter Motor No. 2A armature. | ||
| View original record | To RHC. from EFC. X7625A EFC5/T8.8.27. X.7625A. SEQUENCE STARTER MOTOR NO.2A. SCHEME. Further to our EFC4/LG15.7.27, a fault has developed on the armature of this motor by which it will be necessary… | ||
| scan0096 | Experimental assembly and fitting of a Sequence Starter No. 2A scheme onto 14-EX. | ||
| View original record | To. RHC. from EFC. X7625A EFC2/T10.8.27. X,7625A. SEQUENCE STARTER NO.2A SCHEME. Further to our note of yesterday, I have a note from M.r. Lidsey that they would be glad to have the starter fitted on… | ||
| scan0097 | Modifications and trials of the Sequence Starter No. 2A motor scheme. | ||
| View original record | X7625A To R. from EFC. c. BJ. E. c. BY. EFC1/T24.8.27. EAC. SEQUENCE STARTER NO. 2A SCHEME - INWARD SLIDING ARMATURE. It will be remembered that after making trials of this motor on the bench and on… | ||
| scan0098 | The functionality of an EAC Sequence Starter No. 2A fitted to chassis 14-EX. | ||
| View original record | X7625A To R. from EFC. c. BJ. BY. C. Wor. EFC7/T31.8.27. EAC. SEQUENCE STARTER NO. 2A SCHEME. MOTOR WITH SLIDING ARMATURE. Further to our EFC1/T24.8.27, this starter is now fitted up on chassis 14-EX… | ||
| scan0099 | No. 2A scheme sequence starter, its use on chassis 14-EX, and its development status. | ||
| View original record | To R. from EFC. c. BJ. E. c. BY. BY/RD. X7625A EFC6/T6.9.27. No.2A SCHEME SEQUENCE STARTER. X.7625A. X.7650. No.2A scheme of sequence starter which you have recently seen on chassis 14-EX is the No.2A… | ||
| scan0100 | Page detailing further proposals for experimental chassis components, awaiting working designs. | ||
| View original record | Contd. -2- EFC6/T6.9.27. We have each of the two items (2) and (3) associated with a No.1 item on experimental chassis. Further proposals for which we have not received working designs from W.W. are… | ||
| scan0101 | Modifications and obsolescence of different Sequence Starter schemas. | ||
| View original record | EFC. from R. c. BJ. Wor. c. Hs. BY. E. X7621A RL/M7.9.27. SEQUENCE STARTER. X.7655A/B. X.7625A/B. Sch. 1 with spiral keys is now looked upon as obsolete and scrapped. Sch. 2 as fitted to EAC.7. should… | ||
| scan0102 | The crankchamber for a Phantom sequence starter, specifically addressing the exhaust system. | ||
| View original record | X7625 E.(WW) E.H.C. c.Hs. BY/Cgh14/H. 22.9.27. CRANKCHAMBER FOR SEQUENCE STARTER - PHANTOM. With reference to E2/M.17.9.27. we are proceeding with Scheme 963, which, as you point/out, is only suitable… | ||
| scan0103 | Instructions and blueprint list for fitting a 2.A Starter Motor to an engine. | ||
| View original record | x7625A C. EFC. BY/RD4/ML.26.11.27. E.A.C.7 - STARTER MOTOR. Please receive herewith blueprints of:- D.71506 - Bearing Bracket P.E. D.71507 - Pinion. D.71508 - Retaining Cover. These parts will enable… | ||
| scan0104 | Preliminary trial of a 2A sequence starter motor on an EAC.7 engine, detailing issues with gear teeth jamming and disengagement noise. | ||
| View original record | To R. from EFC. c. BJ. E. c. BY. Wor. x7625A EFC1/T8.12.27. SEQUENCE STARTER. Further to our EFC4/T26.11.27 we have now got the 2A motor back on the EAC.7 engine fitted with parallel teeth with… | ||
| scan0105 | Noise issues on disengagement and potential corrections for helical teeth. | ||
| View original record | -2- Contd. on disengagement is not as bad as it would otherwise be. I am informed by Mr. Lidsey that there was also some whirr on disengagement with the 50 helical teeth but this was comparatively… | ||
| scan0106 | Knock in a starter, attributing it to armature movement and suggesting solutions. | ||
| View original record | Hs. }From R. EFC.} c. to BJ. BY. E. X7625A R8/M28.4.28. EAC.7. STARTER. X.7625A. X.7655 A. I think the recently developed knock is the armature moving endways, due to the engine becoming very free.… | ||
| scan0107 | Checking Mr. Royce's explanation of phenomena related to a starter motor with helical teeth. | ||
| View original record | Hs c. BY/RD. c. EFC. X762SA BY11/G.3.5.28. EAC.7. STARTER. Referring to R8/M28.4.28. the phenomena described by Mr. Royce could be definitely checked as to whether he is correct in his explanation of… | ||
| scan0108 | Page of calculations relating to engine torque, power, and electrical efficiency. | ||
| View original record | X. 7625A X.7625A. NEW ASPECT OF CALCULATIONS EFC/T1.6.27. Engine 1100 lb-inches 35 r.p.m. On conductors :- 1440 lb-inches at 35 r.p.m. or at 13 : 1 ratio. 110.5 lb-inches at 455 r.p.m. Power .80 H.P.… | ||
| scan0109 | The No. 2 B. Scheme for a sequence starter. | ||
| View original record | 7625.D. RR 68 (250T) (DB 925 8-5-25) J.H.D. SEQUENCE STARTER NO.2 B. SCHEME. | ||
| scan0110 | From R. to EFC discussing design specifications for a 'Sequence Starter B'. | ||
| View original record | X7625 To EFC. from R. RL/M116.27. c R. SEQUENCE STARTER B I have decided that this shall push out instead of draw in, and the design we have settled upon permits of a 16 to 1 gear instead of about 13… | ||
| scan0111 | Design and improvements for the Sequence Starter No. 2.B scheme, referencing drawing LeC.2425. | ||
| View original record | To EFC. ) from R. BY. } HS. ) c. to BJ. Wor. X7625B RL/M14.6.27. EAC.7. (B) SEQUENCE STARTER NO.2.B SCHEME. We send herewith drawing LeC.2425 of the improved starter motor (No.2B scheme) Most of the… | ||
| scan0112 | Preparation of calculations for a sequence starter with a 16:1 ratio. | ||
| View original record | x762513 (EFC. absent) To R. from EFC/HEW. c. BJ. SEQUENCE STARTER. Answering your RL/M11.6.27 and RL/M14.6.27, we are preparing a set of calculations based on the 16 : 1 ratio, also with one turn per… | ||
| scan0113 | Revised calculations and experimental suggestions for a No. 2.B. Scheme Sequence Starter. | ||
| View original record | To R. from EFC. c. BJ. BY. c. BY/RD. X7625 13 EFC5/T22.6.27. NO. 2.B. SCHEME SEQUENCE STARTER. Further to our EFC/HEW3/T15627, we now send you revised calculations based on the 16 : 1 gear ratio, to… | ||
| scan0114 | The dimensions and manufacturing specifications for a tapered armature, particularly focusing on grinding and milling. | ||
| View original record | Contd. (2) EFC5/T22.6.27. difficulty with the grinding of punched plates. We feel that the grooves ought in this case certainly to be milled so that the bottom of the groove is parallel to the top, in… | ||
| scan0115 | Advantages of modifying armature slots to improve the magnetic circuit. | ||
| View original record | EFC5/T22.6.27. -3- Contd. as against .050 which seems to be suggested by your note previously mentioned. It occurs to us that there is a distinct advantage in making the bottom of the slots parallel… | ||
| scan0116 | Listing blueprints for starter motor parts and requesting two sets to be put in hand. | ||
| View original record | X.7625B To: RHO. C. EFC: BY/RD8/K. 18. 7. 27. STARTER MOTOR LEC: 2425. FRAME & FIELD WINDING SEC: 8030. Please receive herewith blueprints of the following parts detailed from LeC. 2425. D.71387.-… | ||
| scan0117 | Specifications for the armature taper dimensions on the J. motor for chassis 14-EX. | ||
| View original record | Y7625B EFC/T27.8.27. X.7625B. X.7655B. The armature taper on the J. motor fitted to chassis 14-EX. is such that its diameters at the two ends are 3.100" and 3.004". EFC. | ||
| scan0118 | Extract discussing further design proposals for a combined switch and motor on an experimental chassis. | ||
| View original record | Contd. To R. etc. X7625B -2- EFC6/T6.9.27. (Extract) X.7625A We have each of the two items (2) and (3) associated with a No.1 item on experimental chassis. Further proposals for which we have not… | ||
| scan0119 | Modifications and updates to various schemes of a sequence starter. | ||
| View original record | EFC. from R. c. BJ. Wor. c. Hs. BY. E. X7625 B RL/M7.9.27. SEQUENCE STARTER. X.7655A/B. X.7625A/B. Sch. 1 with spiral keys is now looked upon as obsolete and scrapped. Sch. 2 as fitted to EAC.7.… | ||
| scan0120 | Repositioning of the sequence starter motor due to a new exhaust scheme. | ||
| View original record | To BY. from E. C. BJ. Hs. EFC. X7625B E1/M8.9.27. SEQUENCE STARTER X.7625B. Re mem. RL/M7927, copy just to hand, the drawing mentioned in the last sentence but one is LeC.2425. I am taking up the… | ||
| scan0121 | The fitting of a Sequence Starter, Scheme No. 2B, to car EAC.1. | ||
| View original record | HS c. EFC c. D1/RD. X76257B SEQUENCE STARTER - LEC. 2425 - SCHEME NO. 2B. In order to get this scheme actually fitted to a car quickly, we have arranged the details so that it suits EAC.1. Unless Hs.… | ||
| scan0122 | Preference to install scheme 2B on car EAC-7 14-EX instead of 2A, provided it's completed by mid-December. | ||
| View original record | To BY. from EFC. c. to BY/RD. X2625B EFC2/LG13.10.27. SEQUENCE STARTER - LeC.2425. SCHEME NO.2B. I took up this matter with Hs. yesterday before his departure and he said that provided it was… | ||
| scan0123 | Requesting an R. Bosch starter motor for the experimental production of a No.2B sequence starter. | ||
| View original record | X7625B To E. from EFC. EFCL/T14.10.27. R. BOSCH STARTER MOTOR. X4582 Unless you specially require to have this at West Wittering, we think it would be more useful for us to have the R. Bosch starter… | ||
| scan0124 | Parts required for a starter motor, scheme L.e.C.2425, including a list of attached blueprints. | ||
| View original record | X7625B C. EFC. BY/RD4/ML20.10.27. L.e.C.2425 - STARTER MOTOR. 2.B.Scheme. FRAME AND FIELD WINDING-SEC:8030. Please receive herewith details of parts to L.e.C.2425: Will you please put in hand one set… | ||
| scan0125 | Parts and blueprints for a Starter Motor Commutator (LEC.2425). | ||
| View original record | X7625B TO SHC C. EFC. BY/RD4/ML21.10.27. X7625B LEC.2425 - STARTER MOTOR (2B) 14.EX. COMMUTATOR - SEC:8020. Please receive herewith details of parts to LeC.2425, will you please put one set in hand to… | ||
| scan0126 | Parts, blueprints, and assembly notes for a Starter Motor Armature (LEC.2425) for Chassis 14.EX. | ||
| View original record | To RHC. C. EFC. X7625B BY/RD5/ML21.10.27. X7625B LEC.2425 - STARTER MOTOR (2B SCHEME) 14.EX. ARMATURE - SEC:8000. Please receive herewith details of parts to LeC.2425, and suitable only for fitting to… | ||
| scan0127 | Request for a set of parts and attached blueprints for a Starter Motor, L.O.P. D.71484. | ||
| View original record | X7625B BY/RD4/ML.27.10.27. C. EFC. [Stamp: RECEIVED 27 ...] Lec.2425 - STARTER MOTOR (2.B SCH:) 14-EX. BEARING BRACKETS ETC. SEC:SO10. Please receive herewith details of parts to Lec.2425 and suitable… | ||
| scan0128 | Accompanying a blueprint for starter motor bearing brackets. | ||
| View original record | X 7625B BY/RD3/ML9.11.27. Cº. EFC. LEC.2425 - STARTER MOTOR (2.B SCH). BEARING BRACKETS - SEC:8080. Please receive herewith blueprint of:- D.71484 - General Arrgt: of Bearing Brackets. BY/RD. | ||
| scan0129 | Investigating the cause of jamming issues in a sequence starter motor, with a comparison to a Bosch design and a proposed solution. | ||
| View original record | HS. } FROM R. EFC. } C. to BJ. BY. RECEIVED Hs DEC 7 1927 ORIGINAL 17625B SEQUENCE STARTER. TENDENCY TO JAM. We do not know how much the teeth of the wheels of the latest starter have been rounded. E.… | ||
| scan0130 | Improvements to a starter motor system, focusing on a new magnetic switch and its advantages over other systems. | ||
| View original record | (2) the designs of the main magnetic switch and the hold on switch of a much less costly pattern than the old one we have been using, and as it will only require a simple single press button to work… | ||
| scan0131 | The unfinished scheme for a Phantom direct drive starter motor, outlining design modifications and further actions. | ||
| View original record | BY. FROM E. x762513 E1/M5.12.27. C. to BJ. " " HS. " " EFC. PHANTOM - DIRECT DRIVE STARTER MOTOR - PUSH ENGAGEMENT. We send you herewith LeC. 2496. This is an unfinished scheme dealing with the… | ||
| scan0132 | Potential for rounded gear teeth to cause jamming and suggesting the use of helical gears. | ||
| View original record | BY/RD. [struck through] c. RHC. [struck through] c. HS. X7625/S BY9/G.8.12.27. SEQUENCE STARTER. ---------------- X7655B [struck through] Mr. Royce in his memo R4/M2.12.27. is urging that possibly the… | ||
| scan0133 | Replacing the No.1 starter scheme with a 2B scheme on chassis 9-EX, discussing motor and gear specifications. | ||
| View original record | To R. from EFC. c. RJ. E. c. By. Wor. X762523 EFCLO/T12.12.27. SEQUENCE STARTER 2B SCHEME. X765573 We are now proposing to remove the old No.1 scheme from chassis 9-EX and have this replaced with a 2B… | ||
| scan0134 | The design and proportions for a sequence starter's gear teeth. | ||
| View original record | EAC. ) FROM R. HS. ) (At Le Canadel.) G. to BJ. WOR. BY. E. X/6235B R1/M23.12.27. RECEIVED & DESPATCHED FROM WW. 29.12.27. EAC.10. SEQUENCE STARTER. This is very nearly right now, but requires some… | ||
| scan0135 | Instructions for fitting a 2.B scheme starter motor to a 9-EX chassis, detailing required parts and modifications. | ||
| View original record | X9625B C. EFC. BY/RD1/ML31.12.27. 2B/ scheme to 9EX L&C.2425 - STARTER MOTOR (2.B SCHEME) 9-EX. We recently issued to you instructions to enable the 2.B. scheme of starter motor to be fitted to 14-EX,… | ||
| scan0136 | Typed extract discussing the performance and planned improvements for a sequence starter. | ||
| View original record | X7625B Extract from RL/M31.12.27. EAC.7. X.7770. (From R) The sequence starter seems very good: hope to get it slightly better and somewhat simpler, but it is definitely superior to Phantom and 20 HP.… | ||
| scan0137 | Manufacturing of helical gears and comparing production methods. | ||
| View original record | BY/BD. HS EFC. C. Her. C. RMG. x7625B BYG/G.2.1.28. Hs [Stamp: RECEIVED 31 JAN] SEQUENCE STARTER. Referring to R1/M23.12.27. apparently it will be necessary for us to instruct some further gears. This… | ||
| scan0138 | Description of the control circuits for a Super Sports sequence starter. | ||
| View original record | x7625B EFC. HS.)FROM R. E. ) S E C R E T. RL/M9.1.28. c. BJ. LHS. RG. PN. DA. CWB. C. SG. MR. CLAREMONT. EAC.10. SUPER SPORTS. SEQUENCE STARTER AS DESCRIBED IN 1928. x76253 The control circuits pass… | ||
| scan0139 | Design scheme, patent considerations, and recent improvements to an electrical-mechanical system. | ||
| View original record | -2- Contd. This is the only complete scheme as far as my knowledge goes, and is the property of R-R. Does Mr. Claremont consider our patents cover this, and are they up-to-date? Since our original… | ||
| scan0140 | Super Sports Sequence Starter, specifically the main switch magnet circuit and differences between interlock systems. | ||
| View original record | Y7625B EFC3/T14.1.27. To R. from EFC. c. By. E. c. BJ. Da. c. Mr. Claremont. EAC.10. SUPER SPORTS. SEQUENCE STARTER. Y7655B We have your RL/M9.1.28. We note in your paragraph dealing with the B. or… | ||
| scan0141 | Continued memorandum discussing the necessity of carbon contacts for an electrical interlock. | ||
| View original record | Contd. -2- EFC3/T14.1.28. carbon contacts to accommodate this. It would appear that the carbon contacts provided with the electrical interlock were not necessary. There is, with the mechanical… | ||
| scan0142 | Modifications to a starter motor, referencing blueprint LeC. 2417. | ||
| View original record | To R. from EFC X7625 E2/M23.2.28. c. BJ. BY. HS. EAC.10. STARTER MOTOR. Please find attached blueprint of LeC. 2417. which should clear up the remaining doubtful points on the above. I am sorry that… | ||
| scan0143 | The dispatch of a new drawing for a starter motor and the return of the original drawing. | ||
| View original record | BY. from E. c: to BJ.Hs. X7625 E4/M23.2.28. EAC.10. STARTER MOTOR. We send you herewith drawing LeC.2517., which should clear up the remaining points in question on this job. We also return the… | ||
| scan0144 | The starter motor of the 15-EX Phantom chassis with a sports body after 9000 miles. | ||
| View original record | X7625B Extract from Hs/GWH/LG1 7.3.28. REPORT ON 15-EX PHANTOM CHASSIS WITH SPORTS BODY (9000 MILES) Starter Motor. This has functioned perfectly throughout the test. The condition of the motor was… | ||
| scan0145 | Explaining why a starter motor is running backwards and how to correct it. | ||
| View original record | X.7625 C. EFC. BY/RD2/ML.26.3.28. EAC. STARTER MOTOR. With reference to the starter motor which is running in the wrong direction, this is due to our winding diagram shewing a progressive instead of… | ||
| scan0146 | Issue with a Sequence Starter Motor, specifically abnormal friction in the plain bearing. | ||
| View original record | HHC. from EFC. X7625B EFC3/T3.4.28. SEQUENCE STARTER MOTOR. This appeared to work quite normally and nicely on the teazer current, but when on the main current there appears to be an abnormal friction… | ||
| scan0147 | Light test of an R. Bosch sliding armature motor which resulted in overheating. | ||
| View original record | X762513 5.4.28. R. BOSCH SLIDING ARMATURE MOTOR. X.7625B. X4562 Light test at 6 volts. After 5 mins. commutator end bearing got abnormally hot. Current 44 amperes. Speed. 4000 r.p.m. EFC. | ||
| scan0148 | Instructions and test results for a sequence starter motor. | ||
| View original record | RR 238 (150 BKS.) (DB 451-8-12 24) MP 306975 X7625B. ROLLS-ROYCE LTD. INSTRUCTIONS. To E.7 C. Order No. WC 96 Customer's No. Sequence Starter motor K We have now preliminarily tested this motor on the… | ||
| scan0149 | Instruction note detailing an investigation into an overheating motor and its excessive current draw. | ||
| View original record | ROLLS-ROYCE LTD. INSTRUCTIONS. RR 238 (150 BKS.) (DB 461-8-12 24) MP 306975 To Order No. Customer's No. 19 the motor being 6.3. Upon attempting to run the motor light on the main winding it was found… | ||
| scan0150 | The resistance values for a new motor's windings and overall circuit. | ||
| View original record | ROLLS-ROYCE LTD. INSTRUCTIONS. To Order No. Customer's No. of the new motor The total circuit resistance, however is much less and this would probably account for a proportion of the increased… | ||
| scan0151 | Specifications for a Sequence Starter Motor 2B2 Scheme, detailing armature, field, and main windings. | ||
| View original record | X7625B EFC from BY/RD. 12.4.28. SEQUENCE STARTER MOTOR 2B2. SCHEME. K1 Armature Winding. 45 slots. 2 Conductors per slot. Conductor .145 x .045.. Copper strip (.010 rad. in corners). No. of coils =… | ||
| scan0152 | Requesting temporary arrangements for a brake test on a new sequence starter motor for chassis 9-EX. | ||
| View original record | RHC. from EFC. c. Hs/AJL. X762513 EFC3/T12.4.28. SEQUENCE STARTER MOTOR 2EM SCHEME. As referred to in conversation we are anxious to get this new motor fitted to chassis 9-EX as instructed as soon as… | ||
| scan0153 | Test results for a Sequence Starter Motor K, measuring current, voltage, and speed under cold and warm conditions. | ||
| View original record | X7625B 27.4.28. SEQUENCE STARTER MOTOR K. Motor cold, current on teazer 20 amperes. Volts across teazer = 7.65 1/2 " " main = .12 " " armature = 1.03 Total. 8.80 on 12 volts with the motor stalled the… | ||
| scan0154 | Request for blueprints of starter motor parts, specifically for the armature and commutator sections. | ||
| View original record | x7625 BY/RD7/ML30.4.28. C. EFC. E.A.C.10 - STARTER MOTOR - L&C.2496 & 2517. ARMATURE - SEC:8000. COMMUTATOR-SEC:8020. Please receive herewith blueprints of the following parts for the above sections,… | ||
| scan0155 | Blueprints for new parts required for a Starter Motor. | ||
| View original record | X76258 To. RHC. C. EFC. BY/RD8/ML30.4.28. RECEIVED E.A.C.10 - STARTER MOTOR - L-C.2496 & 2517. FRAME & FIELD WINDING-SEC:8030. Please receive herewith blueprints of new parts required for the above… | ||
| scan0156 | List of blueprints for new parts required for a starter motor, specifically bearings and brackets. | ||
| View original record | V762573 C. EFC. BY/RD9/ML30.4.28. E.A.C.10 - STARTER MOTOR - L&C.2496 & 2517. BEARINGS BRACKETS ETC. SEC. 8010. Please receive herewith blueprints of new parts required for this section, the other… | ||
| scan0157 | Modification to the main field winding of the Sequence Starter Motor 2B Scheme. | ||
| View original record | To EY/RD. from EFC. c. RHC. V7625 EFC6/T3.5.28. SEQUENCE STARTER MOTOR 2B SCHEME. A preliminary brake test of this motor, coupled with the fact that the cross sectional area of the field winding… | ||
| scan0158 | Internal request to order three dozen brushes for a sequence starter sliding armature. | ||
| View original record | X7625B ROY. from EFC. EFC2/T10.5.28. BRUSHES FOR SEQUENCE STARTER SLIDING ARMATURE. Would you please order three dozen Brushes to D.71279. EFC. O/N.54733. | ||
| scan0159 | Request to change the field winding on a sequence starter motor for the 9-EX chassis. | ||
| View original record | X7625 BY/RD2/ML.15.5.28. C. EFC. SEQUENCE STARTER MOTOR. 2.B.SCHEME. FIELD WINDING - SEC:8030. X.7625B Refering to the motor which is built up for 9-EX (E.A.C.1) and which is to be fitted to that… | ||
| scan0160 | Calculations and specifications for a sequence starter motor. | ||
| View original record | X.7625B. 16.6.28. SEQUENCE STARTER MOTOR. Motor torque 100 lb-inches = T. If C = amperes, then on characteristic of supply assumed E = 12 - .02C. and E.H.P. = 12C - .02C² watts. If efficiency = η then… | ||
| scan0161 | Page of calculations determining the number of conductors. | ||
| View original record | -2- No. of conductors :- = (Ts^b x 10^8) / (1.41 P Ø C.) = (1.1T x 2 x 10^8) / (1.41 x 4 x 3.50 BDL x C) = (.1115 x 10^8) / (BCDL) ======== EFC. | ||
| scan0162 | Test results for starter motors on a chassis under hot and cold conditions. | ||
| View original record | X7625 28.6.28. TESTS OF STARTER MOTORS ON CHASSIS. X7620 9-EX. (4:1 Comp. ratio). Ratio 22.37 : 1. X7625 COLD :- Volts 9.62 Amperes 94.0 Engine r.p.m. 53 Motor r.p.m. 1185 HOT :- Volts 10.4 Amperes… | ||
| scan0163 | Test results for a J Motor under cold and hot conditions, detailing electrical and rotational speed measurements. | ||
| View original record | -2- 14-EX (4 3/4 : 1 Comp.Ratio). Ratio 13 : 1. COLD :- Volts 9.3 Amperes 123. Engine r.p.m. 90 Motor r.p.m. 1170 HOT :- Volts 10.10 Amperes 108 Engine r.p.m. 110 Motor r.p.m. 1430 } J MOTOR | ||
| scan0164 | Calculation sheet for a 16:1 ratio sequence starter motor. | ||
| View original record | X7625 30.6.28. 16 : 1 RATIO SEQUENCE STARTER MOTOR. CALCULATION QUANTITIES. (See EFC5/T22.6.27) Torque on conductors = 90 lb-inches. Speed of " = 640 r.p.m. Power converted = .00001587 x 90 x 640 =… | ||
| scan0165 | Page of calculations for engine speed, torque, and electrical resistance. | ||
| View original record | -2- Contd. If Z = 90, Ø = 197,000 Engine speed = 640/16 = 40 r.p.m. Engine torque = .90 x .85 x 16 x 90 = 1100 lb-inches. By the usual tabular calculation the field ampere turns for Ø = 197,000 may be… | ||
| scan0166 | Urgent memo discussing design challenges with the Sequence Starter Motor No. 2B with tapered armature, particularly its tight electric and magnetic circuits. | ||
| View original record | X7625B To BY. from EFC. c. BY/RD. URGENT MEMO. EFCL/T30.6.28. X7625B SEQUENCE STARTER MOTOR NO. 2B SCHEME WITH TAPERED ARMATURE. The size and general arrangement of this motor are such that the… | ||
| scan0167 | Technical discussion on optimizing an electric motor's design by adjusting its electrical and magnetic circuits, including the armature, field winding, and air gap. | ||
| View original record | -2- Contd. up the conductance of the electric circuit on the one hand and the permeance of the magnetic circuit on the other. As regards the armature it so happens that the electrical resistance of… | ||
| scan0168 | Page detailing experimental suggestions for motor field windings and mechanical parts. | ||
| View original record | -3- Contd. the motor when working normally turning the engine on the main supply. Though it is not mainly a question of the preliminary engagement we consider it desirable to retain the longitudinal… | ||
| scan0169 | Specifications and experimental proposals for motor field windings and terminals. | ||
| View original record | -4- Contd . (4) The three terminals on the carcase should be the terminals of the field windings, the centre terminal being the junction of the teazer and main, i.e. the windings should be brought to… | ||
| scan0170 | Page discussing instructions and urgency for work on an experimental chassis and motor windings. | ||
| View original record | -5- Contd. should therefore be pleased if you would instruct for the present moment (handwritten word 'for' above 'present moment') which we are hoping shortly to be able to put on an experimental… | ||
| scan0171 | Specification sheet for Sequence Starter Motor K, listing resistance and setting values. | ||
| View original record | X7625B 2.7.28. X.7625B. SEQUENCE STARTER MOTOR K. Main field resis. .021 ohm. Total resis. .036 ohm. Armature + brush resis. .015 ohm. Armature only. .0138 ohm. Main brushes 9° adv' Air gap .013" -… | ||
| scan0172 | Note on the alignment differences for a sequence motor between two design schemes. | ||
| View original record | EFC. X7625B 2.7.28. X.7625B. SEQUENCE MOTOR. LeC.2425 first on 2B scheme called for centres to align - the two motors based on this; later scheme LeC.2517 calls for .175 difference in centres and… | ||
| scan0173 | Page of calculations titled 'New Aspect of Calculations' for engine and conductor specifications. | ||
| View original record | x76259 4.7.28 X.7625A. NEW ASPECT OF CALCULATIONS EFC/TI.6.27. Engine 1100 lb-inches 35 r.p.m. On conductors :- 1440 lb-inches at 35 r.p.m. or at 13 : 1 ratio. 110.5 lb-inches at 455 r.p.m. Power .80… | ||
| scan0174 | Requesting new Field Coils for the Starter Motor Chassis 9-EX using a heavier section wire. | ||
| View original record | X7625B BY/RD3/E.11.7.28. RHC. c. EFC. ----------- STARTER MOTOR CHASSIS 9-EX. --------------------------- We recently instructed a set of Field Windings for the above motor having 6 1/4 turns per… | ||
| scan0175 | Instructions for building an experimental starter motor for the Phantom chassis to obtain performance data. | ||
| View original record | X-76258 C. EFC. STARTER MOTOR - PHANTOM CHASSIS. EXPERIMENTAL DATA MACHINE. In order to obtain some data on the performance of a machine similar to what we propose to fit to the S.S (E.A.C.10) chassis… | ||
| scan0176 | List of special materials required for a 'data' machine, detailing part numbers and quantities of copper wire. | ||
| View original record | (2). BY/RD3/ML12.7.28. Cont'd. To sum up therefore the new special material required for this "data" machine is:- D.71659 - Dummy Pinion. - 1 off. D.71655 - Bearing Bracket C.E. - 1 " D.71657 -… | ||
| scan0177 | Clarifying the design and components for a new starter motor data machine. | ||
| View original record | To EFC. X76258 BY/RD2/ML1 7.7.28. DATA STARTER MOTOR. Reading through your EFC1/T.30.6.28 again, I note that on page 4 you assume that having 3½ and 6½ turns per pole already made for the motor you… | ||
| scan0178 | Modification and testing of a No. 2B scheme starter motor for the 9-EX model. | ||
| View original record | X762573 To RHC. from EFC. c. HS/AJL. EFCl/T19.7.28. SEQUENCE STARTER MOTOR NO. 2B SCHEME (OUTWARD SLIDING ARMATURE) FOR 9-EX. We are now handing back to you the motor on which you will remember you… | ||
| scan0179 | Performance report on an experimental sequence starter motor. | ||
| View original record | To R. from EFC. c. FJ. E. c. HY. X7625B EFC1/T27.7.28. X.7625B. SEQUENCE STARTER MOTOR PERFORMANCE. This refers to the first motor with tapered and outward sliding armature experimentally produced,… | ||
| scan0180 | The performance discrepancy of a motor, comparing test results against initial design calculations. | ||
| View original record | -2- Contd. The performance of this motor on static torque and brake test did not come quite up to that represented by our calculations dated 22.6.27 based upon the new 16 : 1 ratio, sent under cover… | ||
| scan0181 | Continued analysis of motor performance, comparing torque-ampere characteristics and various armature designs. | ||
| View original record | -3- Contd. torque-ampere characteristic then suffers, not only directly but also as a result of armature reaction, we do not realise any actual improvement in speed against a given large torque. Our… | ||
| scan0182 | Optimizing starter motor performance by comparing armature designs and proposing experimental tests. | ||
| View original record | -4- Contd. The fact that the static torque is less in spite of the larger number of conductors appears to indicate an inferior magnetic circuit. The armature resistance is also greater - .014 ohm as… | ||
| scan0183 | On starter motor armature tests, reverting from a 45 slot to a 41 slot design and proposing a new 37 slot version. | ||
| View original record | X7625B To BY. from EFC. c. BY/RD. EFC4/T20.8.28. SEQUENCE STARTER MOTOR. Our brake torque and efficiency tests have now fully confirmed that the 41 slot tapered armature is considerably superior to… | ||
| scan0184 | Directive regarding work on Sequence Starter Motors for specific experimental chassis. | ||
| View original record | BY/RD X7625' BY/Cgh8/N29.8.28. c. EFC. SEQUENCE STARTER MOTOR. With reference to EFC4/T20.8.28 please note that we should only deal with the Starter Motors for SS chassis and the one which is used for… | ||
| scan0185 | Instruction to hold work on starter motor armatures due to a design change from 45 to 41 slots. | ||
| View original record | X7625/3 BY/RD4/ML.31.8.28. C. EFC. STARTER MOTOR. SS. CHASSIS AND DATA MACHINE. We are now advised by EFC. that 45 slot Armatures are un-satisfactory and that it will be necessary to go to 41 slots,… | ||
| scan0186 | Instructions for building two new 41-slot armatures for S.S. Chassis and Data Starter Motors. | ||
| View original record | X. 7625B To R.H.C. C. EFC. BY/RD1/ML.1.9.28. S.S. CHASSIS AND DATA STARTER MOTORS. L&C.2496 AND 2517. ARMATURES AND COMMUTATORS. Will you please put in hand two armatures, one for each of the above… | ||
| scan0187 | Request to replace springs in a starter motor armature, with a table comparing poundages and rates. | ||
| View original record | X 7625B BY/RDB/ML6.9.28. C. EFC. STARTER MOTOR - 9-EX. ARMATURE - SEC:8000. Will you please put in hand two springs to D.71714 and D.71719 to replace D.71329 at present fitted, we give below a table… | ||
| scan0188 | Instructions to modify the starter armatures for the 'Data Motor' and 'Super Sports' models. | ||
| View original record | To EY. from EFC. c. BY/RD. RHC. X762573 EFC1/T8.9.28. SEQUENCE STARTER ARMATURES INSTRUCTED FOR DATA MOTOR AND SUPER SPORTS. In view of our recent observations and investigations, we think the… | ||
| scan0189 | Requesting suggested taper and slot sizes for an S.S. Chassis armature alteration due to an urgent deadline. | ||
| View original record | To EFC. X76257B BY/RD4/ML10.9.28. S.S. CHASSIS. I have your note re alteration to taper of armature etc. and I am informed that this car is required by R. before he leaves for Le Canada] and that the… | ||
| scan0190 | Instructions for modifying a starter motor to prevent engagement thump and soften the outward blow. | ||
| View original record | X762513 C. EFC. BY/RD5/AL.10.9.28. STARTER MOTOR 9-EX. X762513 We recently instructed you to put in hand two springs for the armature of this machine to stop the thump on engagement and while the… | ||
| scan0191 | Instruction regarding the fitting of a new spring to the sequence starter motor on chassis 9-EX. | ||
| View original record | X7625B To RHC. from EFC. c. Hs/AJL. EFC2/T10.9.28. SEQUENCE STARTER MOTOR ON CHASSIS 9-EX. Referring to the instruction BY/RD6/ML6.9.28, for two new springs D.71714 and D.71719. The new spring in… | ||
| scan0192 | Instructions regarding modifications to a Starter Motor 9-EX to stop thump on engagement. | ||
| View original record | X7625B C. EFC. STARTER MOTOR 9-EX. BY/RD5/ML.10.9.28. We recently instructed you to put in hand two springs for the armature of this machine to stop the thump on engagement and while the machine is… | ||
| scan0193 | Comparative table of starter motor particulars, sheet 2. | ||
| View original record | X.7625 COMPARATIVE STARTER MOTOR PARTICULARS. 2. Headers: Motor., Arm. dia., Arm: condrs., Field turns., Arm: Resis., Field Resis., Field turns / arm:conductors., Field Resis. / arm:resis. Row 1:… | ||
| scan0194 | Modifications for the S.S Chassis Starter Motor & Data Machine, including new parts for the armatures and bearing bracket. | ||
| View original record | To RHC C. EFC. X 7625B BY/RD3/ML18.9.28. S.S CHASSIS STARTER MOTOR & DATA MACHINE. We are now able to give you the new particulars for two 41 slot armatures for the above machines, the diameter at the… | ||
| scan0195 | Instruction to change the spring in the sequence starter motor on 9-EX to improve cold engagement. | ||
| View original record | X762815 To HHC. from EFC. c. Hs/GWH. EFC2/T29.9.28. SEQUENCE STARTER MOTOR ON 9-EX. As soon as conveniently possible the change of spring in this motor, instructed by EFC2/T10.9.28, should be… | ||
| scan0196 | The performance and potential improvements for the No. 2B Scheme Sequence Starter Motor and Gear. | ||
| View original record | To R. from EFC. c. BJ. E. EY. V7621B EFC4/T10.10.28. SEQUENCE STARTER MOTOR AND GEAR. NO.2B. SCHEME. V7655B We have now had considerable experience of the above on chassis 9-EX. The motor in question… | ||
| scan0197 | Armature engagement difficulties, specifically end thump and gear noise, and proposed solutions. | ||
| View original record | -2- Contd. able to return the armature so as to give a second chance of engagement. As we shall further refer to below, we infer that the present armature taper of 3.100 to 2.900 is too large and we… | ||
| scan0198 | Motor performance issues like gear scream and insufficient power, with proposals for a new armature design. | ||
| View original record | -3- Contd. (4) There is a rather high pitched gear scream of relatively short duration when the first engine explosion throws the motor out of gear. (N.B. Disengaging end thump occurs when running on… | ||
| scan0199 | Instructions for modifying a starter motor, detailing required parts and changes. | ||
| View original record | X62575 C. EFC. STARTER MOTOR ON 9-EX. SECS:8000, 8020 & 8040. 37 Slots. The present motor has faults in having too much end movement and insufficient rotational movement and a new armature with less… | ||
| scan0200 | Failures and subsequent fixes for a sequence starter motor and gear. | ||
| View original record | To R. from EFC. c. BJ. E. BY. X762513 EFC2/T13.10.28. SEQUENCE STARTER MOTOR AND GEAR No.2B SCHEME. X765513 Further to our EFC4/T10.10.28, there were originally two minor failings causing failure to… | ||
| scan0201 | 'B failure' discussing spring tension, gear engagement, and potential solutions like using a stronger spring or a rubber washer. | ||
| View original record | -2- Contd. The B failure appeared to occur only with the stronger spring because with the weaker spring the excess of longitudinal traction over spring pressure was sufficient to overcome the slight… | ||
| scan0202 | Performance of different washer materials and a new armature design for the sequence starter motor and gear. | ||
| View original record | X7628B To R. from EFC. c. BJ. E. By. EFC4/T17.10.28. X7655B SEQUENCE STARTER MOTOR & GEAR. Further to our EFC2/T13.10.28 the rubber washer which was temporarily very effective in almost eliminating… | ||
| scan0203 | Reliability and power issues of the 'SS' starter motor. | ||
| View original record | To R. from Hs. c. to BJ. Wor. c. to E. DA. c. to BY. 'SS' STARTER MOTOR. One of the most anxious points we consider in connection with the 'SS' is the starter motor. The present Phantom starter motor… | ||
| scan0204 | Excessive wear on a small pinion and noise issues with a starter gear for car 14-EX. | ||
| View original record | contd :- -2- We are returning to you the small pinion off your car 14-EX. We consider, for the moderate amount of work this car has done, the wear on the pinion is excessive. We have had considerable… | ||
| scan0205 | The design and production challenges of the No. 2B scheme starter motor and gear. | ||
| View original record | To R. from EFC. c. BJ. E. c. Da. Wor. c. Ev. X7625B EFC4/T8.11.28. SS. STARTER MOTOR & GEAR, No.2B. SCHEME. X7625/SS/B. We have previously referred to the fact that the fundamental dimensions of the… | ||
| scan0206 | Technical memorandum discussing modifications and improvements to the SS starter motor, including ratios, pinion wear, and armature design. | ||
| View original record | EFC4/T8.11.28. -2- Contd. and we anticipate in the light of our later experience, a better performance from this than from the 41 slot of which the machines for the SS. cars are at present made. We do… | ||
| scan0207 | Instructions to modify the armature and fit a new bush to the starter motor on 9-EX. | ||
| View original record | x76 25B To RHC. C. Hs/Mr Hancock. C. EFC. BY/RD6/ML.9.11.28. STARTER MOTOR ON 9-EX. Will you please modify the armature in the above Motor to sketch hereunder and produce and fit a new bush to the… | ||
| scan0208 | Peculiarities of the starter motor on car 9-EX, referencing a new armature design. | ||
| View original record | X.7625 Hs. [Struck through] EFC. C.c. Mr. Hancock [Struck through] BY9/G.9.11.28. STARTER MOTOR ON 9-EX. -------------------- When discussing the peculiarities of the starter motor on the above car… | ||
| scan0209 | Technical memorandum detailing improvements and analysis for an 'SS' Starter Motor. | ||
| View original record | Y76213 RL/M10.11.28. Hs. ) from R. EFC) to BJ. Wor. BY. E. DA. "SS" STARTER MOTOR. X.7625B. This was better in many ways on EAC.7 than our present standard, and is not difficult to increase its margin… | ||
| scan0210 | Modifications and trials for a motor, including starter motors and damping. | ||
| View original record | -2- Make a curve of the motor's torque at different amperes, and its state of magnetisation up to reasonable saturation. I have looked over the drawing, and the above are the quantities we should… | ||
| scan0211 | Modifications to the starter motor armature on chassis 9-EX. | ||
| View original record | To RHC. from EFC. c. Hs/CWH. X7625B EFC1/T14.11.28. STARTER MOTOR ON CHASSIS 9-EX. X7655B The instruction of modification to the armature of this motor contained in EY/RD6/ML9.11.28 should be carried… | ||
| scan0212 | Preliminary tests and fitting of a sequence starter motor with a reduced armature taper. | ||
| View original record | X7625B To FHC. from EFC. c. Hs/ACL. EFC2/T16.11.28. SEQUENCE STARTER MOTOR. We have duly made our preliminary tests on the first S.S. motor with reduced armature taper from 3.100" to 3.000", and the… | ||
| scan0213 | Technical memorandum regarding the S.S. Starter Motor, focusing on gear ratio, motor windings, and armature taper. | ||
| View original record | To R. From EFC. c. BJ. E. Da. c. Wor. EY. X7625B EFC4/T16.11.28. S.S. STARTER MOTOR. X7625B X7655B The gear ratio on EAC.7 is the previous 13 : 1 ratio. MOTOR. We have taken great care to get in all… | ||
| scan0214 | Note on reverting from 5° helical to parallel teeth for motor gears. | ||
| View original record | Contd. -2- EFC4/T16.11.28. ------------------- and did not seem to be increased by making of main contact. We are also returning to parallel teeth in place of 5° helical, with the idea that perhaps it… | ||
| scan0215 | Specifications for three comparative trial springs for the 'SS' motor. | ||
| View original record | X762573 BY/RD. from EFC. EFCL/T16.11.28. MAIN ARMATURE SPRING FOR "SS" MOTOR. From the tests we have made we are of the opinion that we should have three springs (a suitable number would be twoe off… | ||
| scan0216 | Specification sheet for alternative armature springs for an S.S. motor, including poundage and rate data. | ||
| View original record | X 7625B BY/RD7/ML.20.11.28. To RHC. [Obscured] C. EFC. ARMATURE SPRING FOR S.S. MOTOR. Please put in hand two each of the following springs which are alternative to D.71719:- D.71931 - Spring. D.71932… | ||
| scan0217 | Methodology and data for starter motor torque and flux. | ||
| View original record | X7625B To R. from EFC. c. BJ. E. c. BY+ EFC3/T20.11.28. SEQUENCE STARTER MOTOR TORQUE & FLUX. X7625B As referred to in our EFC4/T28.11.28, please now receive - (1) Table of starter motor static torque… | ||
| scan0218 | Comparison of performance data for four different types of motors, including standard, sequence, and pre-war models. | ||
| View original record | -2- Contd. The four machines for which the results are given are as follows :- (1) The R.R. standard 6" dia. motor with 90 armature conductors. (2) One of the No.1 type 5" dia. sequence starter motors… | ||
| scan0219 | Table of starter motor static torque data for various motor models. | ||
| View original record | STARTER MOTOR STATIC TORQUE DATA. MOTOR. | Carcass dia. (") | Armature Dia. ("), Length (") | No. of conductors. | No. of field turns per pole. | Torque for 120 amperes (lb-inches) | Corresponding… | ||