Rolls-Royce Archives
| Identifier | Entry | ||
| Scan0 | The design of a Beatonson All-Weather body for chassis 5.G.11 with coachbuilders Messrs G. Beaton & Son Ltd. and Messrs Young of Bromley. | ||
| View original record | TO HS. FROM DA/EV. ORIGINAL. DA/EV2/M1.6.23. RE. BEATONSON ALL-WEATHER FOR 5.G.11. X3730 We are proceeding to fix up the design of the body in detail with Messrs G.Beaton & Son Ltd., and also their… | ||
| Scan1 | Revised design for a Goshawk 11 spring drive, referencing drawing Lec.1727. | ||
| View original record | ORIGINAL TO BY. FROM E. c. to GJ. c. to HS. c. to HT. E3/M2.6.23. GOSHAWK 11. SPRING DRIVE. X4223 We send herewith drawing Lec.1727. shewing the above revised with a view to overcoming the trou-bles… | ||
| Scan2 | Page detailing alterations to the outer drive unit, damper springs, and spanner for reassembly, linking to the standardization of the cooling fan drive. | ||
| View original record | (2) latter is in position on the chassis. Removal in this way however can be easily accomplished by undoing the coupling bolts of the outer drive unit. To facilitate reassembly when the engine is on… | ||
| Scan3 | Performance calculations and proposed modifications for the 40/50 starter motor. | ||
| View original record | TO EFC. FROM R. c. to GJ. c. to BY X9620 40/50 STARTER MOTOR. ORIGINAL R4/M4.6.23. I am in receipt of your calculations with reference to the starter motor - 40/50. This motor and the 30 to 1… | ||
| Scan4 | The design of a teaser circuit and windings for the 40/50 RR dynamo and starter motor. | ||
| View original record | (2) be probably less than you would get from a motor which is at or near saturation under it's normal working load. Mr. Stent has made a drawing shewing the form of thin pan cake coils for the teazer… | ||
| Scan5 | From E. to H.S. requesting a further vibration test on the Goshawk 11 crankcase, as instructed by Mr. Royce. | ||
| View original record | ORIGINAL TO HS. FROM E. c.c. to CJ. c.c. to BY. c.c. to EP. E2/M5. 6. 23. GOSHAWK 11. X.4220 x 634 Referring to the 3000 RPM. vibration, Mr. Royce is not satisfied that the test for proving that this… | ||
| Scan6 | Request for information on the wear and cleanliness of ball joints on temporary Goshawk II radius rods. | ||
| View original record | TO HS. FROM DA. ORIGINAL DA1/M6. 6. 23. GOSHAWK II. RADIUS RODS. X4Z63 There have been more than one car we believe running about fitted with temporary scheme of radius rods, and one at least has done… | ||
| Scan7 | Inspection memo on sample spanners, noting they are too thick and requesting they be reduced to the correct size. | ||
| View original record | TO BY. FROM E. ORIGINAL E2/M12.6.23. c. to GJ. c. to HS. c. to EP. RE. SAMPLE SPANNERS TO LEC.No.1645. X1027 Referring to the above, kindly note the sample has been inspected by Mr. Royce, who… | ||
| Scan8 | New shortened 'D' type instrument board bracket and its attachment. | ||
| View original record | ORIGINAL TO BY. FROM DA. DA3/M12.6.23. c. to Gd. c. to WHS. c. to HS. X4067 X4264 GOS:11. INSTRUMENT BOARD BRACKET - "D" STEERING. We send herewith N.sch. 1424. shewing the shortened instrument board… | ||
| Scan9 | Secret memo regarding the design of new type brush holders for the Goshawk engine. | ||
| View original record | ORIGINAL TO EFC. FROM E. SECRET E. A. C. E1/M14.6.23. X4333 RE. NEW TYPE BRUSH HOLDERS. In reply to your memo. EFC1/T11623., please note we are preparing a new design for the Goshawk on the same lines… | ||
| Scan10 | Query regarding the space allocated for the main field and teazer windings on a starter motor. | ||
| View original record | TO EFC. FROM E. ORIGINAL SECRET E. A. C. X.9620. STARTER MOTOR. Referring to drawing LeC.1728., we should be glad to know whether the spaces allotted to the main field winding and the teazer winding… | ||
| Scan11 | Load, wear, and potential improvements of Goshawk dynamo brush springs. | ||
| View original record | TO EFC. FROM R. ORIGINAL R2/M19.6.23. 2. x 4333 GOSHAWK DYNAMO BRUSH SPRINGS. With reference to these we find (on 5.G.11) that on measuring the load produced by these springs on the carbons by means… | ||
| Scan12 | Proposed improvements to the condensers for the 20.HP model. | ||
| View original record | TO EFC. } FROM R. HS. EP. OY. C. ORIGINAL R7/M19.6.23. X4430 CONDENSERS. The contacts of these as at present made for the 20.HP. are not good enough. The sketch enclosed shews how they can be… | ||
| Scan13 | Performance of tulip-shaped valves versus conical-faced valves and outlining future testing plans. | ||
| View original record | ORIGINAL TO RG. & HS. FROM R. R4/M19.6.23. c. to C.J. OV c. to HH. EP X 3616 We have been using in our valve practice a combination of a tulip shaped valve with a nearly flat face (15°). We have come… | ||
| Scan14 | Dimensional discrepancies of sample spanners and suggested corrections to the production dies. | ||
| View original record | TO BY. FROM E. c. to Gd. c. to HS. c. to EP. ORIGINAL. E1/M19.6.23. SAMPLE SPANNERS TO LeC.1645. X1027 We agree that the jaws of the sample spanners are no more than .045" larger than correct size in… | ||
| Scan15 | Design and material for improved valves for car engines, proposing a 30 degree face angle. | ||
| View original record | TO RG. & HS. FROM R. COPY to CJ. and BJ. VALVES. X4226 X2764 X3616 Regarding the improved valves for the engines, I am getting Mr. Elliott to set out what we think an ideal valve for the car engines… | ||
| Scan16 | Design options for front axle radius rods and associated components. | ||
| View original record | TO BY. FROM DA. c. to GJ. c. to HS. GOS: 11. RADIUS RODS FOR FRONT AXLE. X4263 We send you herewith N.sch.1426. shewing the bracket for the rear end of the radius rods and revised ball joint which Mr.… | ||
| Scan17 | Mr. Royce's feedback on the Spare Wheel Carrier Dust Cover, requesting it be remade from black-enamelled sheet aluminium due to the current version being too heavy. | ||
| View original record | ORIGINAL TO BY. FROM DA/EV. c. to R. and HS. DA/EV1/M20.6.23. X4085 GOS: SPARE WHEEL CARRIER DUST COVER - N.SCH.1366. We have seen one of these on 4.G.11., and Mr. Royce has remarked that he does not… | ||
| Scan18 | Mr. Royce's feedback on design features, including tool storage and sloping screens, for a Beatonson All-Weather Body. | ||
| View original record | TO LHS. FROM DA/EV. c. to HS. BEATONSON ALL-WEATHER BODY. X3730. We thank you for your note of the 19th inst., and note your comments. It is thought that the hood may clear the spare wheel when down,… | ||
| Scan19 | Proposed improvements and standardization of the Goshawk Magneto. | ||
| View original record | ORIGINAL TO HS. FROM R. c. to CJ. c. to BJ. c. to PN. RE.GOSHAWK MAGNETO. X355/ I suggest that we push on with the standardisation of the magneto (without distributor) and the rest of the scheme,… | ||
| Scan20 | Modifications and specifications for the 20 HP chassis headlamps. | ||
| View original record | TO BY. FROM DA/EV. COPY TO - R. & HS.✓ ORIGINAL. DA/EV1/M22.6.23. 2 RE. 20.HP. CHASSIS HEAD LAMPS. X4291 X4090 Referring to your BY11/P14623. and BY/C11/P20623. from what you say we gather that you… | ||
| Scan21 | From 'R' to 'HS' discussing running issues with the 4.G.11 Goshawk 11 engine, including a sticking air valve and noisy gears. | ||
| View original record | ORIGINAL. TO HS. FROM R. c. to RG. 4. GOSHAWK 11. X4219 X4589 I was not proud of the running of 4.G.11. when I took Mr. Rowledge to the station. I afterwards examined the cause and found the air valve… | ||
| Scan22 | Causes of and solutions for backlash and noise in Goshawk engine half time gears. | ||
| View original record | TO HS. FROM R. c. to GJ. GOSHAWK - HALF TIME GEARS. Please find attached questions we desire answering as regards the effect of backlash in half time gears (R4/M25623.) (Handwritten note: bring the… | ||
| Scan23 | Investigation into gear knocks on the Goshawk 11 engine, proposing experiments with gear slack. | ||
| View original record | TO HS. FROM R. c. to RG. c. to CJ. ORIGINAL GOSHAWK 11. - HALF TIME GEARS. X6569 It has not been clearly demonstrated to my mind whether gear knocks are due to the camshaft alone or to a combination… | ||
| Scan24 | Concerns about features on cars from Springfield, particularly wheel and tyre specifications. | ||
| View original record | ORIGINAL. TO HS. FROM R. C.c. to DA/EV. X3614 X3894 I have received several photographs of finished cars from Springfield. The following features appear doubtful practice:- (1) The Sankey type of… | ||
| Scan25 | Final construction details and timeline for a 20.HP All Weather Car. | ||
| View original record | ORIGINAL TO LHS. FROM DA/EV. DA/EV3/M28.6.23. c. to HS. ✔ RE. 20.HP. ALL WEATHER CAR. Y3730 We have now fixed up the final details of the construction of this car with Mr. Beaton, and as far as we are… | ||
| Scan26 | Uncertain position of the magneto bracket for a 20.HP chassis, specifically for Goshawk models with L.H. steering. | ||
| View original record | TO BY. FROM E. c. to CJ. HS. RE. 20.HP. CHASSIS MAGNETO BRACKET FOR NEW TYPE MAGNETO. X 3557 In reply to your BY7/P21623. it is a little uncertain at the present moment where the position of the… | ||
| Scan27 | Secret memorandum discussing the current requirements and winding design for a starter motor. | ||
| View original record | TO EFC. FROM R. SECRET. R3/M29.6.23. E. A. C. X 9620. STARTER MOTOR. With reference to your calculations regarding the starter motor, the current required for turning this motor with a teazer winding… | ||
| Scan28 | From Mr. Royce requesting an experimental trial of a vacuum pump for the 40/50 petrol feed system. | ||
| View original record | TO HS. FROM DA. ORIGINAL 40/50 VACUUM FEED. X3579 X3575 X3503 Mr. Royce wishes to try experimentally and temporarily a vacuum pump on the petrol system, to see whether it is preferable to get a pump… | ||
| Scan29 | Oil being flung from the Goshawk 11 propeller shaft universal joint. | ||
| View original record | Da. from Hs. ORIGINAL Hsl/LG1.6.23. GOSHAWK 11, PROPELLER SHAFT. X4254 X4255 The most frequent cause of oil being flung out from the Universal Joint is that an excess amount of oil is forced into the… | ||
| Scan30 | Preliminary report on investigations into dynamo regulation, brush sparking, and commutator tests. | ||
| View original record | To R. from EFC. c. CJ. WOR. c. Hy. EFC2/12.6.23. V1402 X4333 As a preliminary answer to your R2/M30.5.23:- (1) We have now made a start on the re-investigation of external dynamo regulation, at… | ||
| Scan31 | Experimental silent starter motor actuation scheme on chassis 6EX. | ||
| View original record | To R & E. from EFC. c. C.J. & PN. c. Da. c. Hy. c. EP. EFC1/T2.6.23. X.4168b - SILENT STARTER MOTOR ACTUATION - H15/CHS.8.20. - We have now had working on experimental chassis 6EX for a week or two, a… | ||
| Scan32 | The development of an engine starting system, discussing its performance, advantages, and future application. | ||
| View original record | Contd. -2- EFC/T2.6.23. only of a suitable nature for a temporary apparatus for the purpose of trying out the principle, and there is a possibility of failure occurring at these contacts. For the time… | ||
| Scan33 | Circuit diagram for a starter motor actuation system. | ||
| View original record | X4168G. STARTER MOTOR ACTUATION To R15/G 23.8.20 Battery Push Button Switch C Main Switch Two-way relay switch D A B Actuator Box (with auxiliary contact) Starter Motor E.7.C 9/9/20 | ||
| Scan34 | Tests on a Goshawk steering wheel for the 6-MX car, which caused irritating shocks, and a recommendation based on test results. | ||
| View original record | R. from Hs. c. to C.J. c. to H. c. to Dx. c. to BY. ORIGINAL. Hs4/LGS. 6.23. STEERING. X.4264 X.4557 6-MX Car, you will remember, was fitted with a Goshawk type steering wheel. We proved on this car… | ||
| Scan35 | Tests about the effect of tyre pressures on maximum speed. | ||
| View original record | ORIGINAL, To H. from Hs. c. to CJ. c. to E. c. to Du. c. to BY. Hs3/LG2.6.23. X4578 ✓ X3538 EFFECT OF TYRE PRESSURES ON MAXIMUM SPEED. You will remember at Le Canadel the question was raised with… | ||
| Scan36 | Tests conducted to determine the effect of tyre pressures on the performance of the 40/50 model. | ||
| View original record | EFFECT OF TYRE PRESSURES ON 40/50 PERFORMANCE. We carried out tests to determine the effect of tyre pressures on - (a) Speedometer readings. (b) Acceleration and maximum speed. (c) Tractive… | ||
| Scan37 | Tyre tests, checking road figures related to speed, tractive resistance, and fuel consumption. | ||
| View original record | CHECK ON ROAD FIGURES. TYRE TESTS. 1.6.23. (a) Speedometer reading. Increase in recorded speed 5% " increase in r.p.m. of wheels 5% " decrease in effective circumference of tyres 5%(nearly). This is… | ||
| Scan38 | The small percentage difference in petrol consumption between different tyre pressures. | ||
| View original record | contd :- -2- produces a correspondingly small percentage difference in the consumption. The difference in petrol consumption between tyres at 40 lbs. per sq.in. pressure and 50 lbs. per sq.in.… | ||
| Scan39 | Graph showing the effect of tyre deflation on tractive resistance at various speeds using well-worn Canadian Dunlop Cord tyres. | ||
| View original record | TESTS TAKEN ON 3 EX. CANADIAN DUNLOP CORD USED WELL WORN. T.R LBS. PER TON M.P.H TYRES 30 LBS [] TYRES 30 LBS [] EFFECT OF TYRE DEFLATION ON TRACTIVE RESISTANCE. SOFT TYRES INCREASE TRACTIVE… | ||
| Scan40 | Visit from the British Lighting & Ignition Company regarding a new voltage regulator system. | ||
| View original record | To R. from EFC. c. to CJ. ORIGINAL EFC3/T9.6.23. X.4589 - B.L.I.C. VOLTAGE REGULATOR. We yesterday received a visit from two representatives of the B.L.I.C. (British Lighting & Ignition Company) and a… | ||
| Scan41 | Hand-drawn circuit diagram for a DC motor. | ||
| View original record | R + | ||
| Scan42 | Seeking clarification on whether a new brush holder design is for the E.A.C. dynamo or the 20 HP brush gear. | ||
| View original record | SECRET ORIGINAL To E. from EFC. c. to By/Ds. E. A. C. EFC1/T11.6.23. X.9670 - RE NEW TYPE BRUSH HOLDERS With reference to LeC.1725, though not stated therein, it is assumed from the commutator… | ||
| Scan43 | Proposing a test for the quality of electrical contacts carrying high-frequency currents using an oscillatory circuit. | ||
| View original record | To R & E. from EFC. c. C.J. & F.H. c. Hy & EF. c. RG. c. HJT. ORIGINAL EFC2/T11.8.23. X.4054 - RE ELECTRICAL CONTACTS. Electrical contacts through which have to pass high frequency currents such as… | ||
| Scan44 | The causes of noise from sliding electrical contacts and a proposed test for the microphonic effect. | ||
| View original record | Contd. -2- EFC2/T11.6.23. according to its degree of goodness. A poor contact will cause noise due to quite small vibrations existing from any cause, without other disturbance. Noises are caused by… | ||
| Scan45 | Repair and installation of a new engine in a 4-Goshawk-11 car. | ||
| View original record | To R. from Hs. X1698 R - Hs G.file X4219 X1698 Hs4/LG11.6.23. We have just received 4-Goshawk-11 back from France. The damage to the coachwork due to the accident has been repaired. We are, therefore,… | ||
| Scan46 | Technical report on the investigation and specifications of a Scintilla dynamo and regulator. | ||
| View original record | To H. R-d. from H-C. c. G.J. & D.W. c. By. & EP. c. Dc. * /L ORIGINAL ECL/T12.6.23. X.4290 - SCINTILLA DYNAMO AND REGULATOR. This was received by us from Messrs. Scintilla Ltd., in January last, and a… | ||
| Scan47 | Specifications and analysis of a machine's electrical components and construction. | ||
| View original record | Contd. -2- EFC1/T12.6.23. Field Circuit. Number of wound poles ---- 4 Arrgt. of coils ---- all in series. Resistance of field circuit at 18°C ---- 4.6 ohms. Armature Circuit. No. of slots ---- 15 No.… | ||
| Scan48 | Performance analysis of a machine's electrical output at various temperatures and speeds. | ||
| View original record | EFCL/T12.6.23. -3- Contd. (a) Volt-speed Curve from 10 to 17 volts, normally cold. (b) Volt-speed Curve from 10 to 17 volts, normally hot. (c) Ampere output curve starting normally cold with scheduled… | ||
| Scan49 | Performance comparison against a post-war R.Bosch machine and a description of a three-component regulator unit. | ||
| View original record | Contd. -4- KFC1/T12. 6.23. The performance in these respects, i.e. (c) and (d), is somewhat less good than that of the post-war R.Bosch machine. For the sake of easy comparison we give curves showing… | ||
| Scan50 | Description of the function of different coils within a cutout, auxiliary relay, and regulator system. | ||
| View original record | Contd. -5- EFC1/T12.6.23. system. On the cutout there are the usual series and shunt coils, on the auxiliary relay there is a shunt or volt-operated coil only, but on the regulator there are as many… | ||
| Scan51 | Continued description and criticism of an electrical system's operation, referencing volt-speed curves. | ||
| View original record | Contd. -6- EFC1/T12.6.23. which is also connected, is then entirely insulated from the dynamo, (apart from the common earth return). There is a resistance of 59 ohms across the contacts operated by… | ||
| Scan52 | Analysis of an auxiliary relay's voltage characteristics, hysteresis loop, and potential risk to lamps. | ||
| View original record | Contd. -7- EFCl/T12.6.23. current curves are shown, having been taken by an ammeter direct in the field current circuit. A word of explanation is needed here - it requires, as set by the makers, a… | ||
| Scan53 | Continued report page discussing voltage regulation performance and comparing it with Bosch, Bijur, and Tirrill systems. | ||
| View original record | Contd. -8- In addition to this the difference of operating voltage between hot and cold volt-speed curves is also about twice as much as occu on the old R. Bosch. It will be noted that the end of the… | ||
| Scan54 | Technical explanation of current regulation in a dynamo-battery circuit, detailing the interaction of series and shunt coils. | ||
| View original record | Contd. -9- load current, which is the battery current, remains constant, though the two (dynamo and load) currents themselves increase progressively, and at the same rate. Actually we find the… | ||
| Scan55 | Comparison of a Scintilla electrical unit's performance against an R. Bosch system, noting issues with operating voltages and complexity. | ||
| View original record | To R. Contd. -10- EFC1/T12.6.33. so that this would be the value of the regulated current before operation of the auxiliary relay, when the battery is alone in the circuit. One of the objections to… | ||
| Scan56 | The desirability of a regulator system for the chassis, comparing various manufacturers' units. | ||
| View original record | Contd. -11- EFC/T12.6.23. Some such system is considered highly desirable on R.R. chassis. It overcomes difficulties such as fusing difficulties, running with battery disconnected, etc. which we have… | ||
| Scan57 | Wiring diagram for a Scintilla Dynamo Regulator System. | ||
| View original record | [ "SCINTILLA DYNAMO REGULATOR SYSTEM", "CUT-OUT", "AUX. RELAY", "REGULATOR", "5", "4", "3", "37 Ω", "67 Ω", "782 Ω", "152 Ω", "59 Ω", "E.F.C.", "23-1-23", "X 4290" ], | ||
| Scan58 | Graph plotting the open-circuit volt-speed characteristics for a Scintilla Dynamo, with and without a vibrator regulator. | ||
| View original record | OPEN-CIRCUIT VOLT-SPEED CHARACTERISTICS OF SCINTILLA DYNAMO (No E887) Vibrator regulator controlled & uncontrolled FIELD AMPERES VOLTS DYNAMO R.P.M. Hot Cold O.C. volts (uncontrolled) Field current… | ||
| Scan59 | Performance curves of plain shunt-wound dynamos showing volts and amperes vs. speed under hot and cold conditions. | ||
| View original record | [CHART III - TOP LEFT] Roman Numeral: III Title: OPEN CIRCUIT VOLT-SPEED CURVES OF PLAIN SHUNT WOUND DYNAMOS FOR COLD CONDITIONS Main Label: COLD VOLTS Y-Axis: E.M.F (VOLTS) X-Axis: DYNAMO SPEED (RPM)… | ||
| Scan60 | Comparison report on the stability and top-heaviness of a Maythorn Saloon versus a standard Hooper Limousine on a 20 HP chassis. | ||
| View original record | To R. from Hs. c. to CJ. c. to E. c. to Da. c. to BY. ORIGINAL. Hs2/LC13. 6. 23. MAYTHORN SALOON AND OTHER 20 HP. BODIES. X3730 V X4535 We have made a careful comparison between the Maythorn Saloon… | ||
| Scan61 | The methodology for tests to determine the centre of gravity for various car types. | ||
| View original record | TESTS TO DETERMINE POSITION OF CENTRE OF GRAVITY OF VARIOUS TYPES OF CAR. We originally intended to carry out these tests by jacking the car up on, say, the off-side, placing the wheels on blocks of… | ||
| Scan62 | Report page detailing the methodology of experiments comparing different Goshawk-11 car models. | ||
| View original record | contd:- -2- Before carrying out the experiments we inserted blocks between the axles and the frame in normal position and pulled the springs down to the blocks. The same blocks were used in the same… | ||
| Scan63 | Table detailing the Centre of Gravity and total weight for Goshawk-11 car models with different coachwork. | ||
| View original record | EFFECTIVE TYRE DIAMETER TAKEN AT 31.4" Car. C. of G. in length. C. of G. in width. Ht. of C. of G. above the ground. Springs choc-a-bloc at normal Total weight of car. 2-Goshawk-11. Touring car.… | ||
| Scan64 | Report estimating the weight of the car roofs for two Goshawk models, a Saloon and a Limousine. | ||
| View original record | WEIGHTS OF BODY CAR ROOFS. We endeavoured to roughly estimate the weight of the two car roofs of 7-Goshawk-11 and 3-Goshawk-11. On the 4th Saloon car we stripped the covering from the under-side of… | ||
| Scan65 | Comparison of roof specifications for Saloon and Limousine Goshawk-11 models. | ||
| View original record | DETAILS OF BODY CAR ROOFS. Details. | (Saloon) 7-Goshawk-11. | (Limousine) 3-Goshawk-11. Average height above frame of roof between windscreen and front and rear step iron. | 4 ft. 5 15/16" | 4 ft.… | ||
| Scan66 | Weight comparison and analysis between the 3-Goshawk-11 and 7-Goshawk-11 models. | ||
| View original record | DETAILS OF 3-GOSHAWK-11 AND 7-GOSHAWK-11. In order to account for the 2 cwts. greater weight of 7-Goshawk-11 we examined the two cars with the following results :- Extra weight 7-Goshawk-11 chassis.… | ||
| Scan67 | Calculation of the theoretical cornering speeds at which a touring car and a bodied car would overturn. | ||
| View original record | To estimate the theoretical speeds at which a touring car and bodied car with centre of gravities as found could negotiate a corner of 100 ft. radius if their springs were chocked up. This is assuming… | ||
| Scan68 | Improving 20 HP car shock absorbers by changing to a single-stage setting. | ||
| View original record | To R. from Hs. c. to CJ. c. to E. c. to EY. c. to Da. ORIGINAL Hs2/LG14.6.23. RE. 20 HP. SHOCK ABSORBERS. X4329 X4426 We have carried out tests and find that we can improve the 20 HP. cars when… | ||
| Scan69 | Design issues with a butterfly valve in the exhaust pipe, focusing on seizing and rattling problems. | ||
| View original record | To R. from Hs. c. to CJ. c. to E. c. to De. c. to BY. ORIGINAL. Hsl/LG14.6.23. BUTTERFLY VALVE IN EXHAUST PIPE. Y3436 As it appears probable that we shall frequently use this fitting, we suggest that… | ||
| Scan70 | Commutation issues and potential improvements for a 20 HP dynamo. | ||
| View original record | To R. From EFC. [crossed out] C. EF. Ev. ORIGINAL EFC?/T19.6.23. X.4383 - 20 H.P. DYNAMO - COMMUTATION. It is suggested that commutation might be better if the armature slots were skewed half a pitch… | ||
| Scan71 | Calculations and specifications for an E.A.C. Starter Motor. | ||
| View original record | ORIGINAL SECRET E. A. C. To R. from EFC. c. CJ. EY. EFC4/T19.6.23. X.9620 - RE E.A.C. STARTER MOTOR. Answering your R4/M4.6.23, herewith please receive further calculations revised to suit as nearly… | ||
| Scan72 | Different winding arrangements for a starter motor experiment. | ||
| View original record | Contd. -2- EFC4/T19.6.23. the scheme sent herewith, which has been got out for us by the D.O., shows these two arrangements of main and teazer windings, both of which are proposed for experiment in… | ||
| Scan73 | Calculations for an E.A.C. starter motor's torque, speed, and power requirements. | ||
| View original record | 19.6.23. X.9620 - E.A.C. STARTER MOTOR Overload engine torque assumed to be 1900 lb-inches. Speed reduction ratio = 30 Taking 85% gearing efficiency, effective torque ratio = .85 x 30 = 25.5 Overload… | ||
| Scan74 | Design calculations for an electric motor armature, including torque, flux, conductor, and slot specifications. | ||
| View original record | -2- Contd. The static torque at this current must be 10% greater (say) than the running torque, i.e. it must be 82 lb inches. Take a useful polar flux density of 6700 lines per cm² reckoned on minimum… | ||
| Scan75 | Calculations for motor electrical properties, including back E.M.F. and resistance. | ||
| View original record | -3- Contd. The back E.M.F. when rolling engine = Ø Z N P / (60 x 10^8 x b) = (200,000 x 82 x 900 x 4) / (60 x 10^8 x 2) = 4.92 volts Forward E.M.F. at motor terminals = 8.44 Hence E.M.F. for… | ||
| Scan76 | Page of calculations for armature resistance, dimensions, and slot area. | ||
| View original record | -4- Contd. Resistance of one armature turn = .007 x 4 / 41 = .000683 Length of armature turn = 11" approx. Resistance per 1000' = 12000 / 11 x .000683 = .746 w But ohms per 1000' at 20°C = .00815 ÷… | ||
| Scan77 | Page of calculations for an armature and field winding. | ||
| View original record | -5- Contd. Armature diameter at root of tooth = 3.100 - .875 = 2.225 Circumference ditto = 7.00" For one tooth and slot =.171 Hence width of tooth at root = .071 (Here see table p.6) Ampere turns per… | ||
| Scan78 | Calculation table for ampere-turns required to produce magnetic flux. | ||
| View original record | -6- AMPERE TURNS NECESSARY TO PRODUCE FLUX REQUIRED Part. Mstl. Length (") Virtual section (sq. ins) Total flux. Flux density Inch Units. Flux density Cm. Units. H. A.T. per inch. A.T. Armature teeth.… | ||
| Scan79 | Calculation for the cross-sectional area of a strip and its equivalent wire gauge. | ||
| View original record | -7- The cross sectional area of the strip = .00815 / .695 = .0117 sq.in. i.e. equivalent nearly to 10 S.W.G. round wire. EFC. | ||
| Scan80 | Comparing the hill-climbing capabilities of the 40/50 and 20 HP models. | ||
| View original record | To R. from Hs/Rm. c. to CJ. c. to E. c. to Da. c. to BY. c. to EP. ORIGINAL HsRm1/LG21.6.23. COMPARISON OF CLIMBING CAPABILITIES. X488+ 40/50 AND 20 HP. The equivalent gradient surmountable figures… | ||
| Scan81 | Comparison of climbing capabilities for the 40/50 HP and 20 HP models. | ||
| View original record | COMPARISON OF CLIMBING CAPABILITIES. 40/50 HP. and 20 HP. Guaranteed weights 39 and 55 cwts. Tyre dia's taken as 31.4 and 33 ins. ηP at rear wheels. 76 " 69 lbs. per sq. in. SPEED. Gear Ratio. Power… | ||
| Scan82 | Calculation of climbing capabilities for the 40/50 HP and 20 HP engines. | ||
| View original record | CLIMBING CAPABILITIES - 40/50 HP. & 20 HP. Let d = dia. of cyl. (ins.) " S = stroke (ins.) " ηP = mean effective pressure (lbs. per sq. in.) " T = torque (ins.lbs.) Then in a 6-cyl. 4 cycle engine,… | ||
| Scan83 | Page of calculations for power delivery to the rear wheels and power available for hill climbing, accounting for tyre and transmission losses. | ||
| View original record | -2- Power delivered to rear wheels allowing for rear tyre losses and transmission losses :- 40/50 HP. = 54.8 X gear ratio. 20 HP. = 37.71 X " " Allowing 50 lbs. per ton as an average tractive… | ||
| Scan84 | 5000-mile equivalent continuous running bench and commutation test of a 20 HP dynamo. | ||
| View original record | To R.A.E. from EFC. C. CJ. E.PH. H. Da. Ry. EP. X.4283 - R.R. 20 H.P. DYNAMO - CONTINUOUS RUNNING BENCH & COMMUTATION TESTS. We have now completed the equivalent of 5000 miles bench running on a… | ||
| Scan85 | Brush wear and commutator condition after a 2500-mile test run, noting issues with mica. | ||
| View original record | Contd. -2- EFC1/TUT.6.23. fair but there was slight sparking. The commutator blackened somewhat, but uniformly, i.e. not more particularly pronounced on some parts of the segments than on others. At… | ||
| Scan86 | Commutation and brush wear tests, detailing performance at different loads and conditions. | ||
| View original record | EFC1/T27.5.23. -3- Contd. There was a perceptible improvement in the commutation from the point of view of sparking and wear, though the surface of the commutator again attained approximately the same… | ||
| Scan87 | Results of a 5000-mile equivalent test, focusing on brush wear and commutator condition. | ||
| View original record | EFC1/T27.6.25. -4- Contd. Positive brush .017" Negative " .018" Control " .0245" Equivalent of 5000 miles at 3500 R.P.M. As previously, the machine was restarted without alteration having been made.… | ||
| Scan88 | Continuous running tests for a 20 HP Dynamo, focusing on brush and commutator performance when reversing polarity. | ||
| View original record | ORIGINAL To R & E. from EFC. c. CJ. & PN. c. BY. EP. DA. EFCl/T30.6.23. X.4383 - 20 H.P. DYNAMO - CONTINUOUS RUNNING BRUSH & COMMUTATOR TESTS. K4333 Further to our EFCl/T27.6.23, we have now completed… | ||