Rolls-Royce Archives
| Identifier | Entry | ||
| scan 001 | Investigation into the cause of failure of Champion sparking plugs removed from a Falcon XI engine using doped fuel. | ||
| View original record | D/4/11. E.E.344. ROYAL AIRCRAFT ESTABLISHMENT. Report No. E.E.344. Investigation of the Cause of Failure of Champion Sparking Plugs Type R.11.V. Removed from Rolls-Royce "Falcon" XI Engine using Doped… | ||
| scan 002 | Summary page discussing irreversible changes in spark plug conductivity and proposing further engine tests. | ||
| View original record | E.E.344. (Summary). 2. conductivity very rapidly and assume insulation values comparable to those given by new plugs. (d). This change, which was found to be irreversible and permanent in character,… | ||
| scan 003 | The failure of Champion sparking plugs from a Falcon XI engine using doped fuel. | ||
| View original record | D/4/11. E.E.344. ROYAL AIRCRAFT ESTABLISHMENT. Report No.E.E.344. Investigation of the Cause of Failure of Champion Sparking Plugs Type R.11.V. Removed from Rolls-Royce "Falcon XI" Engine using Doped… | ||
| scan 004 | The inspection and testing procedures for engine spark plugs. | ||
| View original record | E.E.344. -2- 3. General Inspection of the Plugs. The open end of the plugs was examined and one of the plugs was detached for inspection. The surfaces exposed to the engine gases were found coated… | ||
| scan 005 | Results of spark plug measurements at atmospheric temperature, including a table of values and analysis. | ||
| View original record | E.E.311. 3. Table I. Results of Measurements at Atmospheric Temperature. | Plug No. | Gap Inches. | Sparking Characteristics under air Pressure. | Insulation Resistance 1,000 volt Megger Ohms. |… | ||
| scan 006 | The testing of plug insulation resistance at high temperatures and pressures. | ||
| View original record | E.E.341. 4. working conditions i.e. 200-300°C. The method adopted in this test was as follows:- The plug was screwed into an electrically heated cylinder supplied with air pressure at 500 lb/sq.in. in… | ||
| scan 007 | Test report on spark plug insulation resistance and sparking characteristics after heating and cooling, followed by engine tests. | ||
| View original record | K.S.341. 5. Table II. Effective Insulation Resistance after Heating and cooling. Plug No. | Effective Resistance by Magneto Ohms. | Insulation Resistance by 1000 Volt Megger. | Sparking… | ||
| scan 008 | General comments and conclusions from an investigation into spark plug performance and failure, particularly with doped fuel. | ||
| View original record | E.S.344. 6. 7. General Comments. The general inference to be drawn from this investigation is that a plug running slightly hotter than the R.11.V. is required to cope with the deposit formed on the… | ||
| scan 009 | Cross-sectional drawing of a Champion R11.V sparking plug showing its components. | ||
| View original record | DRG. Nº EE. 1651 Issued by:- Directorate of Technical Development. AIR MINISTRY DEPT. ELECTRICAL DRAWN F. R. J. TRACED M.R 28-2-28 CHECKED S.D.A. 8/3/28 APPROVED C.G.Brunks 12.3.28 CHAMPION R11.V… | ||
| scan 010 | Graph of regular sparking voltage versus temperature for a Champion R-II-V sparking plug from a Falcon XI engine. | ||
| View original record | DRG.NO E.E.1668. Issued by: Directorate of Technical Development. AIR MINISTRY DEPT. ELECTRICAL DRAWN S.D.Q. TRACED L.E.B. 19.3.24 CHECKED [Signature] APPROVED G.E.B. 19.3.25 MAXIMUM MAGNETO VOLTAGE… | ||
| scan 011 | Graph showing the increase of available plug voltage due to the increase of temperature for a Champion Sparking Plug, Type R-II-V, from a Falcon XI engine. | ||
| View original record | DRG.NO E.E.1669. Issued by:- Directorate of Technical Development. AIR MINISTRY DEPT. ELECTRICAL DRAWN S.G.A. TRACED L.E.B. 19.3.28 CHECKED H.F. APPROVED G.E.B. 19.3.28 S.P.402. E.E.1669. MAXIMUM… | ||
| scan 012 | Graph showing the relationship between temperature and effective insulation resistance for a Champion R-11-V sparking plug. | ||
| View original record | DRG.Nº E.E.1670. ISSUED BY: Directorate of Technical Development. AIR MINISTRY DEPT. ELECTRICAL DRAWN S.D.A TRACED L.E.B. 19.3.28 CHECKED HtH APPROVED GRB 19.3.28 S.P.402. FIG.3. CURVE SHOWING… | ||
| scan 013 | Graph showing the effective insulation resistance versus temperature for a Champion R-II-V sparking plug. | ||
| View original record | DRG.NO. E.E.1671 Issued by:- Directorate of Technical Development. AIR MINISTRY DEPT. ELECTRICAL DRAWN S.J.Goodman TRACED L.E.B 19.3.28 CHECKED [Signature] APPROVED C.C.S. 19.3.28 S.P.402. EFFECTIVE… | ||
| scan 014 | Specifications for new designs of 40/50 and Goshawk dynamos and motors, including dimensions and performance requirements. | ||
| View original record | X.4384 EFC/T3.3.21. X.294. X.543. NEW DESIGNS OF DYNAMOS AND MOTORS. X.3534. The outside carcase dimensions settled upon by Mr. Royce during my visit were as follows :- 40/50 dynamo = 6" 40/50 motor… | ||
| scan 015 | Specifications for dynamos, including winding, armature teeth, and a request for calculations from Mr. Royce. | ||
| View original record | -2- Contd. The dynamos are to be single field winding third brush controlled with a span on the field coil over the commutator of about 130 electrical degrees, thus the field coil can be excited by… | ||
| scan 016 | Correspondence concerning design prints for the Goshawk I & II starter motor and dynamo. | ||
| View original record | X4384 To R. from Da. c. to En. c. to EFC. Da16/GB16.3.21. X.3533/4.- GOSHAWK I & II STARTER MOTOR & DYNAMO. X.3945. X.4383/4. We send you herewith a print of "N" Scheme 773 - Brush Holder for Motor,… | ||
| scan 017 | Extract from a meeting discussing the future construction of starter motors and materials like bakelite. | ||
| View original record | X.3534. 4384 Extract from E6/G31.3.21. Re Electrical Matters. Re Visit of Messrs. Wormald & Hives to W.W. on 19.3.21. (11) STARTER MOTORS ( GENERAL). X.543 . X.3513. X.3534. 4384 In constructing the… | ||
| scan 018 | In-house production of starter motors and dynamos for the Goshawk II. | ||
| View original record | To WOR. from R. a. to CJ. c. to BJ. c. to EY. c. to EFE. c. to HS. X 4384 R3 G5.4.21. X.543. RE STARTER MOTORS & DYNAMOS, ETC. X.3533.4383 X.294. X.2534.4384 It is understood that there is some doubt… | ||
| scan 019 | Request to make enquiries with external firms regarding a starter motor for the Goshawk II engine. | ||
| View original record | To EFC. from R. Copy to CJ. " " WOR. " " DA. " " HS. " " BY. Handwritten top center: X. 4384 Handwritten top right: R9/G6/4/21. Handwritten: X.4384 RE "GOSHAWK II" ELECTRICAL EQUIPMENT. Handwritten:… | ||
| scan 020 | Design specifications for the 'Goshawk II' dynamo and starter motor, particularly the bearings and helical gear. | ||
| View original record | X4384 To EPC. from R. c. to CJ. c. to Da. c. By. c. Hs. R3/G9.5.21. X.3533 RE "GOSHAWK II" DYNAMO AND STARTER MOTOR. X.3534. With reference to the dynamo for "Goshawk II" this will have to have… | ||
| scan 021 | From EFC arranging a meeting regarding Goshawk II dynamo and starter motor windings. | ||
| View original record | X.4384 To R. from EFC. c. CJ. EFC1/T18.5.21. 4383 X.2035 [crossed out and '4384' handwritten above] GOSHAWK II DYNAMO AND STARTER MOTOR WINDINGS. With reference to your note R3/G9.5.21 it will be… | ||
| scan 022 | Details on the reduction ratio for the Goshawk I and Goshawk II starter. | ||
| View original record | S.R. 255a-(100 T) (R.H. 29, 22-7-20) G 2769 X.4384 EFC/T24.5.21. X. 3534 - REDUCTION RATIO FOR GOSHAWK STARTER X.4384. Goshawk I was originally fixed at 48 to 1, but was later altered to 14.4 to 1.… | ||
| scan 023 | Preliminary electrical calculations and specifications for the Goshawk II starter motor. | ||
| View original record | To Da. from EFC. c. By c. Da/Thr. c. By/WER. X.4384 EFC1/T2.6.21. X.4384 - GOSHAWK II STARTER MOTOR. During my visit to Mr. Royce we made together some preliminary calculations for Goshawk II starter… | ||
| scan 024 | Configuration of field windings and brushes for ignition purposes. | ||
| View original record | Contd. -2- EFC1/T2.6.21. settled. He mentioned that the field winding should begin at the stud near the driving end and near the switch, ending on one pair of brushes; the other pair of brushes will… | ||
| scan 025 | Design of Dynamo and Starter Motors for Goshawk I and II engines. | ||
| View original record | X.4384 To B. from EFC. c. Da/Thr. EFC2/T7.6.21. X.4383/4 - DYNAMO & STARTER MOTOR FOR GOSHAWK II. X.3533/4 - DYNAMO A STARTER MOTOR FOR GOSHAWK I. We are awaiting from you sketches or layouts of the… | ||
| scan 026 | Drawing No. LeC.1405 for Dynamos & Motors for Goshawk I & II and 40HP Chassis. | ||
| View original record | X4384 E1/G9.6.21. To Da. from E. c. to CJ. c. to Wor. c. to By c. to Hs. c. to EFC. X.4383 RE R R. DYNAMOS & MOTORS - "GOSHAWK I & II" X.4384. AND 40HP. CHASSIS. We send you herewith drawing No.… | ||
| scan 027 | Cover note for prints of dynamos and motors for Goshawk I & II and 4CH P. chassis. | ||
| View original record | X.4384 To By. from Da/Stt. c. to Hs. c. to TB (1 print). c. to FHC(1 print). De/Stt6/CN10.6.21. X.4383/4 - R.R. DYNAMOS & MOTORS - "GOSHAWK I & II" AND 4CH P. CHASSIS. Please receive herewith three… | ||
| scan 028 | Requesting particulars for the Goshawk II dynamo and motor, expressing concerns about potential delays. | ||
| View original record | X4384 To EFC. from E. E6/G23.6.21. X.4384 X.4383. RE "GOSHAWK II" DYNAMO & MOTOR. X.4342. X.4359. Would you kindly note Mr. Royce wishes you to let him have the particulars of the "Goshawk II" dynamo… | ||
| scan 029 | Calculations and design considerations for the Goshawk II starter motor. | ||
| View original record | X.4384 To R. from EFC. c. CJ. c. E. c. Da. c. Da/Thr. EFC2/T4.7.31. X.4384 - GOSHAWK II STARTER MOTOR. We are sending you herewith calculations in connection with the above motor. The drawings are… | ||
| scan 030 | Calculations and practical construction for the Goshawk II starter motor. | ||
| View original record | H.R. 281a (100 T) (S.H. 798. 10-12-20) G. 2948 To EFC. from R. c. to CJ. X.4384 R1/G7.7.21. X.4384 - RE "GOSHAWK II" STARTER MOTOR. We are very pleased to receive your calculations which seem quite… | ||
| scan 031 | Drawings for the 'Goshawk II' starting motor and field coils. | ||
| View original record | To BA. From E. Copy to CO. WOR. HS. DV. E.G. X4384 RE "GOSHAWK II" STARTING MOTOR. Herewith please receive drawing Lec.1428 shewing the starter motor for "Goshawk II", also Lec.1425 giving particulars… | ||
| scan 032 | Specification for a dummy model Armature to test the winding feasibility for the 'Goshawk' II design. | ||
| View original record | To ING. C. to EB. examine. EFC X4384 EXPERIMENTAL FC BY/ARE/EM 17. 8. 21. RECEIVED X.4384. "GOSHAWK" II - R.R. DESIGN OF It is required that a dummy model Armature, with complete Winding be produced… | ||
| scan 033 | The winding diagram and connections for a 4-pole single series type armature. | ||
| View original record | EXPERIMENTAL BY/WERA/EM 17. 8. 21. We have not as yet produced a Winding Diagram but when we say that it is of the 4 pole single series type and connected retrogressively in the manner shewn below,… | ||
| scan 034 | Calculations and specifications for the Goshawk II starter motor. | ||
| View original record | X4384 1.7.21. X.4384 - GOSHAWK II STARTER MOTOR. Torque required to turn Goshawk engine = 500 lb-inches. Speed reduction ratio = 8.4 Take 90% gearing efficiency, then effective torque ratio .90 x 8.4… | ||
| scan 035 | Calculations for motor design parameters, including armature dimensions, flux, and conductor numbers. | ||
| View original record | -2- Contd. allow for torque losses, i.e. 72.7 lb-inches. Suppose we take a useful polar flux density of 6500 lines per cm.2, reckoned on minimum pole face. This is necessarily low to give a reasonable… | ||
| scan 036 | Calculations for electrical properties including Back E.M.F., ohmic resistance, and armature values for a motor. | ||
| View original record | Contd. -3- Back E.M.F. when rolling engine = Ø Z N P / (60 x 10^8 x b) = 161,000 x 116 x 810 x 4 / (60 x 10^8 x 2) = 5.05 volts. Forward E.M.F. = 9.26 volts. E.M.F. to overcome ohmic resistance = 4.21… | ||
| scan 037 | Calculations for the resistance of an armature turn and corresponding wire size. | ||
| View original record | -4- Contd. Resistance of one armature turn .0192 x .4 = __________ 58 = .001325 Length of armature turn = 10" approx. Resistance per 1000' = 1200 x .001325 = 1.59 w This agrees with proposed size of… | ||
| scan 038 | Calculation table for the ampere turns necessary to produce the required flux. | ||
| View original record | AMPERE TURNS NECESSARY TO PRODUCE FLUX REQUIRED. Part. | Matl. | Length (inches) | Virtual section (sq.ins) | Total flux. | Flux density inch units. | Flux density cm. units. | H. | A.T. per inch |… | ||
| scan 039 | Calculation sheet for the design and resistance of a field winding. | ||
| View original record | -6- Contd. Ampere turns required = 738 Amperes - 137 .. No. of turns - 5½ per coil. Length of mean turn - 8½" approx. .. Total length of field strip = 4 x 5½ x 8½ + 6" (say) = 187 + 6 = 193" Estimated… | ||
| scan 040 | Drawings for the 'Goshawk II' Starter Motor Brush Spring and Housing modification. | ||
| View original record | To DA. from E. Copy to O.J. " " WOR. " " HS. " " RY. " " E.O. X43844 ORIGINAL E2/G19/7/21. X4384 RE "GOSHAWK II" STARTER MOTOR. We send you herewith drawings LeC.1430/1 shewing Starter Motor Brush… | ||
| scan 041 | Requesting the Experimental Department make a dummy model armature for the 'Goshawk II' motor and dynamo. | ||
| View original record | TO BY. from DA/T. Copy to HS. EFC. X4384 FC AUG 12 DA/T1/G10/8/21. RECEIVED X4384 X4383 RE "GOSHAWK II" MOTOR AND DYNAMO. X1640 Would you please issue the necessary information to the Experimental… | ||
| scan 042 | Instruction to produce two dummy model armatures for the 'Goshawk II' Dynamo and S Motor, with a request to allocate experimental numbers. | ||
| View original record | X4384 R.R. 965A (100 T) (S H. 119. 11-8-20) G 2600 To Ex. Office. BY/WER2/EF17.8.21. 43 X.3283. "GOSHAWK II" - R.R. DESIGN OF DYNAMO X.4384. & S MOTOR. X.1640 We are issuing instructions for producing… | ||
| scan 043 | Winding diagram and specifications for the 'Goshawk' starter motor. | ||
| View original record | (D 11) A.M. 798. 50-12-20. O 2947 To EFC. X.4384. EXPERIMENTAL BY/WER5/EF18. 8. 21. "GOSHAWK" 11. R.R. DESIGN OF STARTER MOTOR. We have made up a Winding Diagram for the above motor D.50219 of which… | ||
| scan 044 | Performance analysis of a C.A.V. Z.C. starter motor on a Goshawk engine. | ||
| View original record | X.4384 26.8.21. X.3247 - PERFORMANCE OF C.A.V. Z.C. STARTER MOTOR ON "GOSHAWK" ENGINE WITH 8.4 RATIO AND ESTIMATED FLUX ETC. X.4384. Motor torque, allowing 90% torque efficiency. 64.7 lb-inches.… | ||
| scan 045 | Specification of brushes for the Goshawk II dynamo and motor. | ||
| View original record | X.4384 EFC. from EY. BY3/P30.8.21. X.3945. GOSHAWK II. DYNAMO & MOTOR X.4383. X.3348. LeC.1428 & 1436. X.4384. In E1/G29821 replying to certain queries which I raised in connection with the above… | ||
| scan 046 | Performance comparison of the Goshawk II motor as applied to the Goshawk I engine with different reduction ratios. | ||
| View original record | X 4384. To R. from EFC. c. to CJ. c. to E. c. to Da. c. to Da/T. } at W. Wittering. EFC1/T30.8.21. X.4384 - "GOSHAWK II" MOTOR APPLIED TO "GOSHAWK I" ENGINE. We attach table showing our estimate of… | ||
| scan 047 | Calculations for applying a Goshawk II motor to a Goshawk I engine. | ||
| View original record | X.4384 - GOSHAWK II MOTOR APPLIED TO GOSHAWK I ENGINE. Torque required to turn Goshawk I engine = 500 lb-inches. Speed reduction ratio = 14.4 Take 90% gearing efficiency then effective torque ratio =… | ||
| scan 048 | Page of calculations for current, volts, engine speed, horsepower, and efficiency. | ||
| View original record | -2- Contd. Hence actual current = (42.5 x 2 x 10^8) / (1.41 x 116 x 4 x 136,500) = 95.5 amperes. Volts according to standard = 10.1 Ohmic volts = 95.5 x .0301 = 2.9 Speed volts 7.2 Speed N = (60 x… | ||
| scan 049 | Obtaining new specimen brushes for the 'Goshawk II' dynamo and motor due to altered holder dimensions. | ||
| View original record | X4384 To EX. from EFC. c. to By/WER. EFC1/T31.8.21. X4384 X4383 X3948 (crossed out) X3348 (crossed out) RE BRUSHES FOR "GOSHAWK II". DYNAMO AND MOTOR. In answer to your Ey3/P30.8.21, we have already… | ||
| scan 050 | List of drawings and particulars for the 'GOSHAWK' II S.S. Motor and Dynamo field poles and armature stampings. | ||
| View original record | X4584 EXPERIMENTAL BY/WER2/EF2. 9. 21. RECEIVED X.4384 - "GOSHAWK" II - R.R. Design of S.S.Motor. (Field Poles). Please receive herewith one blue print of each of the following drawings, these will… | ||
| scan 051 | Manufacturing method and material for Armature Stampings. | ||
| View original record | R.R. Z14 (10 T) (S.J 194.9.6.21). EXPERIMENTAL BY/WER2/EF2. 9. 9. 21. It will be noted that the slots are to be punched into the Stampings instead of being milled out after the core has been… | ||
| scan 052 | Parts list for the 'Goshawk' II S.S. Motor, covering bearing brackets, brush holders, and cross connectors. | ||
| View original record | [STAMP] EXPERIMENTAL [HANDWRITTEN] X.4384 [STAMP] E.O. [SIGNATURE] BY/WEKL/RF9. 9. 21. [STAMP] RECEIVED 10 MAY 1921 X. 4384 - "GOSHAWK" II. R.R. DESIGN OF S.S. MOTOR. Bearing Brackets, Brush Holders,… | ||
| scan 053 | Modifications, materials, and production methods for various experimental components. | ||
| View original record | EXPERIMENTAL BY/WER/EF9. 9. 21. Spring Lid Rotherham Oil Cup No. 27 - Screwed ¼” - 26 T.P.I. R.H. Regarding D.50220D.C. Bearing Bracket, we have arranged for this to have slotted holes for the… | ||
| scan 054 | 'Goshawk' II S.S. Motor and Dynamo, requesting an order for commutator brushes for testing. | ||
| View original record | R.R. 235a (10 T) (SJ 194.9.6.21). To EFC. EXPERIMENTAL X4384 BY/WER3/LF9. 9. 9. 21. X. 4384 - "GOSHAWK" II - R.R. Design of S.S. Motor. X. 4383 - "GOSHAWK" II - R.R. Design of Dynamo. Please receive… | ||
| scan 055 | Requesting an order for two dozen brushes for the Goshawk starter motor. | ||
| View original record | X 4384. To Wd. from EFC. EFC3/T10.9.21. X.438S - R.R. GOSHAWK STARTER MOTOR. X 3348 Would you kindly order up from the Morgan Crucible Company, two dozen brushes in their C.M.3 quality Morganite, to… | ||
| scan 056 | Parts list and specifications for the 'Goshawk II' starter motor frame and two field winding options. | ||
| View original record | R.R. 235A (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13. X.4384. BY/WER2/EP21. 9. 21. EXPERIMENTAL RECEIVED X. 4384 - "GOSHAWK" II - R.R. DESIGN OF STARTER MOTOR Frame and Field Winding. In connection… | ||
| scan 057 | Experimental specification sheet for field winding, tape, wire, and related electrical components for the Goshawk II unit. | ||
| View original record | D. 50397 Field Winding. D. 50318 Wire for -do- - 2 - BY/WER2/EE21. 9. 9. 21 EXPERIMENTAL 25 ft of Egyptian Tape (.007) x 3/8" wide will be required on the Frame and Field Winding with 5 1/2 turns per… | ||
| scan 058 | The dispatch of dummy armatures for the 'Goshawk' dynamo and motor. | ||
| View original record | X4384 To R. from EFC. c. CJ. c. E. c. Da. EFC2/T23.9.21. X.4383. R.R. DYNAMO AND MOTOR FOR "GOSHAWK". X.4384. We are now having sent to you under separate cover the dummy armatures of the R.R. Goshawk… | ||
| scan 059 | Instructions to despatch dummy armatures for the Goshawk dynamo and starter motor to Mr. Royce for inspection. | ||
| View original record | X4384 To Wd. from EFC. c. Shipping Office. c. Despatch Stores. EFC1/T23.9.21. X.4383/4. R.R. DYNAMO AND MOTOR FOR "GOSHAWK". We are sending into the Stores dummy armatures of the R.R. Goshawk dynamo… | ||
| scan 060 | Details and parts list for the 'Goshawk' II Starter Motor Armature. | ||
| View original record | X4384 EXPERIMENTAL BY/WMP/ER?. 9. 21. RECEIVED X. 4384 "GOSHAWK" II - R.R. DESIGN OF STARTER MOTOR. ARMATURE. In connection with the above section please receive herewith one blue print of each of the… | ||
| scan 061 | Component updates and instructions for a starter motor assembly, including Bendix Drive parts. | ||
| View original record | EXPERIMENTAL - 2 - BY/WER2/EF27. 9. 2. 27. Frame and Field Winding (7 1/4 turns per coil) D.50097. Bendix Drive. D.50095. Blue prints of the Bendix Drive L.O.P. have previously been issued to you. In… | ||
| scan 062 | Induction noise and starter motor issues for the Goshawk 11 engine. | ||
| View original record | To R. from Hs. c. to CJ. c. to E. c. to Da. c. to BY. c. to EP. c. to Wor. [Handwritten] X4384 Hs2/LG14.10.21. GOSHAWK 11. X.4218. INDUCTION ROAR. X.4227. We are disappointed with the improvement made… | ||
| scan 063 | Modifications and requirements for dynamo and motor armature windings. | ||
| View original record | To Mr. Brock from R. c. to CJ. c. to EFC. c. to Hs. X4384 R7/G10.10.21. X.4383. RE DYNAMO AND MOTOR ARMATURE WINDINGS X.1640. X.4384. Speaking generally, I am very pleased with the specimen windings.… | ||
| scan 064 | Note on preventing the failure of machine windings by addressing creep and examining competitor designs. | ||
| View original record | Contd. -2- R7/Glo.10.21. the end of the winding are liable to creep along and come off, possibly some extra precaution can be taken to prevent the possibility of this happening (which would mean a… | ||
| scan 065 | Note regarding dynamo and motor armature windings for the Goshawk model. | ||
| View original record | X4384 To Ry. from EFC. EFC1/T13.10.21. X.4383. X.4384. RE DYNAMO AND MOTOR ARMATURE WINDINGS. X1640 Herewith please receive two copies of a note received from Mr. Royce with reference to the model… | ||
| scan 066 | Technical note regarding the starter motor threads, start type, and gearing noise. | ||
| View original record | X.4384 17.10.21. "xtract from R9/G17.10.21 X 4219. STARTER MOTOR X.4384. You will notice that we gave no instructns about the pitch or angle of the threads. The drawing shews what was possibly two or… | ||
| scan 067 | Extract detailing drawings for the 'Goshawk II' and 'Swallow' engine designs to be discussed with Mr. Hives. | ||
| View original record | XL4384 Extract from R1/G5.11.21. RE "GOSHAWK II" AND "SWALLOW" DESIGNS. We are expecting Mr. Hives here on Monday to further discuss the Goshawk and other experimental work. We are handing to him… | ||
| scan 068 | Extract discussing production delays and material specifications for the Goshawk electrical equipment's commutator. | ||
| View original record | X.4384 Extract from R14/G9.11.21. RE GOSHAWK ELECTRICAL EQUIPMENT. X.4383. X.4384. X.3348. X.3945. I have been surprised at the slowness of the production of the starter motor and dynamo but… | ||
| scan 069 | Experimental memo on modifications to Armature Stampings for the 'Goshawk' S.S. Motor and Dynamo, involving the trial use of Mica Plates. | ||
| View original record | H.R. 199 (5000 12-17) MF18585 C. to I & C. [Signature] X. 4384 EXPERIMENTAL BY/WER2/EF9. 12. 21. "GOSHAWK" 11. S.S.MOTOR AND DYNAMO. Armature Stamping for Motor D.50286/7. " " " Dynamo D.50288/9.… | ||
| scan 070 | From Mr. Royce requesting an investigation into the effectiveness of rounded flywheel teeth for the Goshawk starter. | ||
| View original record | To Hs. from E. c. to CJ. c. to By. c. to Da. X.4384 E4/M3.1.22. X.4384 - RE GOSHAWK STARTER Kindly note Mr. Royce would like you to ascertain whether roundededges on the flywheel teeth are better or… | ||
| scan 071 | Use of rounded teeth on Goshawk 11 engine starters, noting this differs from American practice. | ||
| View original record | To E. from Hs. X4384 Hs1/LG6.1.22. X 4384 "GOSHAWK" STARTER. At the present time, all the Starters which we are using on Goshawk 11. engines are working with the edges of the teeth rounded off, not… | ||
| scan 072 | First Goshawk II starter motor sent for testing, detailing modifications and production halt. | ||
| View original record | X 4384 To EFC. from RHC. c. to WOR+ RHC1/LG14.1.22. X.4384 - GOSHAWK II STARTER MOTOR X. 3348. We are sending the first Goshawk II starter motor for test. This machine is fitted with a P.D. (all… | ||
| scan 073 | Clarifying if flywheel teeth edges are rounded in addition to starter pinion teeth. | ||
| View original record | S.34 X.4342 Extract from EL/MIO.1.22. X.4219 X.4220 With regard to your memo. Hsl/LG6.1.22., it is not clear from your note whether the edges of the flywheel teeth are rounded off in addition to the… | ||
| scan 074 | Instructions for building the Goshawk 11 starter motor, detailing required drawings and parts. | ||
| View original record | R.R. 199 (500 H) (SD. 296. 15.3.17) M.P. 1849. XL4384 BY/WER1/EP24. 1. 22. EXPERIMENTAL RECEIVED X. 4384 - "GOSHAWK" 11. R.R. DESIGN OF STARTER MOTOR. We are now issuing instructions to enable you to… | ||
| scan 075 | Compiling a complete record of the first motor produced, noting slight differences from previous versions. | ||
| View original record | - 2 - above sections only differ slightly from the old ones. we have compiled these in order that a complete record will still exist of the first motor produced. BY/VER. WHR [illegible text] | ||
| scan 076 | Note on the differing dimensions of Morganite brushes ordered for the Goshawk motor. | ||
| View original record | X.4384. Jan 26th 1922. EFC. PB.34. X.3348 MORGANITE BRUSHES FOR GOSHAWK MOTOR X.4384. Morganite C.M.3 brushes ordered under D.1564 and originally meant for Gos.1 are .75" x .3" while those ordered… | ||
| scan 077 | Instructing the build of the commutator section for the Goshawk 11 starter motor. | ||
| View original record | X4384 EXPERIMENTAL BY/WERG/EF3. 2. 22. RHM C. to Sft. EFC. WG. X. 4384 - "GOSHAWK" 11. R.R. DESIGN.OF STARTER MOTOR Further to our memo BY/WERH/EF24. 1. 22 in which we instructed the latest… | ||
| scan 078 | Drawing number LeC.1531 for the Goshawk II starter motor cable connection. | ||
| View original record | X4384 To Da. from E. c. to CJ. c. to Wor. c. to By. c. to Hs. c. to EFC. E5/M4.2.22. GOSHAWK II - STARTER MOTOR CABLE CONNECTION. We send you herewith drawing No. LeC.1531 showing the terminal… | ||
| scan 079 | Experimental request to alter the armature winding for a Goshawk starter motor to reduce electrical resistance. | ||
| View original record | R.H. 1360 (to T.) (S.H. 988. 22/2/22.) Em. 598878. X. 4384 BY/WER3/EF6. 2. 2. 22. STAMP: EXPERIMENTAL X. 4384 "GOSHAWK" 11. R.R. DESIGN OF STARTER MOTOR. SECTION 8000 - L.O.P. D. 50616. The above… | ||
| scan 080 | Requesting an order for Goshawk starter motor brushes from the Morgan Crucible Company. | ||
| View original record | To Wd. from EFC. V26384 EFC3/T18.2.22. X.4384 - STARTER MOTOR BRUSHES - GOSHAWK. V3348 Will you kindly order up from the Morgan Crucible Company, 1 dozen sets (4 dozen brushes) in their C.M.3 quality… | ||
| scan 081 | Agreeing to reposition a motor terminal on the Goshawk II crankcase by twisting the motor 45 degrees. | ||
| View original record | To By. from E. c. to CJ. c. to Wor. c. to Hs. E4/M22.2.22. X4384 GOSHAWK II. X.4384. POSITION OF MOTOR TERMINAL. In reply to your By17/P20.2.22, we agree that the terminal should be moved up, but we… | ||
| scan 082 | Instructions detailing the brush position and advance settings for a Goshawk Motor. | ||
| View original record | RR 238 (300 Bks.) (SF 152. 6-11-18.) MP 197880 X. 4384. ROLLS-ROYCE LIMITED. INSTRUCTIONS. To E.F.C. Order No P.B. 35 Customer's No. X 4384 Feb. 28th. 1922 Brush Position on Goshawk Motor. The neutral… | ||
| scan 083 | Instruction sheet for modifying the brush gear on Goshawk motor No. 4. | ||
| View original record | RR 235 (100 Bks.) (SP 152. 6-11-18.) MP 197880 X. 4384 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To E.F.C Date: Mar. 2nd 1922 Order No P.B.36. Customer's No. X3534 Brush Gear on Goshawk Motor No. 4. It is… | ||
| scan 084 | Instructions for standardising the re-setting of brushes on the Goshawk motor. | ||
| View original record | To By. from EFC. c. to By/WER. c. to RHC. X4384 EFC1/T2.3.22. RE SETTING OF BRUSHES ON GOSHAWK MOTOR. The correct position for the brush setting on this motor is now standardised and is equivalent to… | ||
| scan 085 | Experimental design change for the 'Goshawk' 11 starter motor, specifically altering the frame and field winding. | ||
| View original record | RHC. c. to SFB. FB. EFC. W.R. X. 4384. BY/WERL/EF4. 3. 22. EXPERIMENTAL X. 4384 - "GOSHAWK" 11. R.R.DESIGN OF STARTER MOTOR. FRAME AND FIELD WINDING - SECTION 8030. All the Starter Motors which you… | ||
| scan 086 | Revision to the Goshawk 11 Starter Motor winding diagram and instructions to alter existing armatures. | ||
| View original record | RHC. c. to EFC. X.4384 BY/WER12/EF7. 3. 22. "GOSHAWK" 11. STARTER MOTOR. D.50219 Winding Diagram for the above Starter Motor has again been revised in accordance with alteration No. 500/D. The… | ||
| scan 087 | Request for the weights of various components of the Goshawk Dynamo and Motor. | ||
| View original record | To Wor/Mr. Brock. X.4384. EFC2/T10.3.22. From EFC. X.4383. GOSHAWK DYNAMO AND MOTOR. X.4384. Would you kindly let me have sometime at your convenience:- 1. The bare weight of carcase and pole pieces… | ||
| scan 088 | List of dynamos, motors, and batteries for various Goshawk chassis models. | ||
| View original record | X.4384 EFC/T15.3.22. DYNAMOS, MOTORS AND BATTERIES ON VARIOUS GOSHAWK CHASSIS. Dynamo. Motor. Battery. Dist. Board. 1 Goshawk II. Rotax. Lucas C.A.V.Willard open-touring. 12XR3/3. 2 Goshawk II R.R.2.… | ||
| scan 089 | Erection and assembly instructions for the Goshawk R.R. starter motor. | ||
| View original record | To By. from EFC. Y4384 EFC3/129.3.22. X.4384 - GOSHAWK R.R. STARTER MOTOR. We give below for inclusion in the arrangement drawing as erection instructions, or independently, as you may think fit, a… | ||
| scan 090 | Production testing procedures for Goshawk electrical units and motors. | ||
| View original record | Contd. -2- EFC3/T29.3.22. receive a motor with altered field and armature windings. It will be understood that, until we issue the specification of production test of any of the Goshawk electrical… | ||
| scan 091 | Production test results sheet for Goshawk starter motors, test number 1. | ||
| View original record | X4384 X.3604 - PRODUCTION TEST RESULTS. GOSHAWK STARTER MOTORS (TEST 1). Motor No. | Amperes. | Volts. | Speed. | Speed/Volts. | Springs. | Remarks. 1 | — | — | — | — | — | Tests to find best brush… | ||
| scan 092 | Production brake test results for Goshawk starter motors. | ||
| View original record | X.3604. PRODUCTION BRAKE TEST (TEST 2) OF R.R. GOSHAWK STARTER MOTORS. Weight of pan and portion of rope :- 4 lbs. 14 ozs. Motor No. | Load in pan (W) | Spring balance (S) lbs. ozs. | W + S lbs. ozs.… | ||
| scan 093 | Flux test report for a motor with two sets of readings under different brush settings. | ||
| View original record | MOTOR FORM 1. FLUX TEST OF MOTOR. Date:- 27.1.22. Motor under test :- R.R. Gos No:- / No. of excitation turns per pole :- 5 1/2 No. of armature conductors in series between brushes:- 58 [Handwritten… | ||
| scan 094 | Flux test report for a motor, form 1. | ||
| View original record | MOTOR FORM 1. FLUX TEST OF MOTOR. Date:- 28.1.22 Motor under test:- R.R. Gas. No:- 1 No. of excitation turns per pole. 5 1/2 No. of armature conductors in series between brushes. 58 2nd | Exciting… | ||
| scan 095 | Flux test report for a motor, detailing performance at different speeds and currents. | ||
| View original record | MOTOR FORM 1. FLUX TEST OF MOTOR. Date:- 28.1.22 Motor under test:- R.R. Gos. 2nd No:- / No. of excitation turns per pole. 5 1/2 No. of armature conductors in series between brushes. 58 | Exciting… | ||
| scan 096 | Torque test results for an R.R. Goshawk motor at 1500 r.p.m. | ||
| View original record | MOTOR FORM 3. TORQUE TEST OF MOTOR (at given speed); Date: - 1.2.22 Motor under test: - R.R. Goshawk Speed 1500 r.p.m. No: - 1 Reduction gear ratio:- Weight of pan and portion of rope: - 5 lbs. 0 ozs.… | ||
| scan 097 | Brake test results for a starter motor. | ||
| View original record | MOTOR FORM 5. Prelim Crank X.300-9 - BRAKE TEST OF STARTER MOTOR. Date:- 2.2.22 Motor under test:- R. R. Gos. Dia. of brake wheel - 10" No:- 1 Weight of pan and portion of rope 5 lbs. 3 ozs. Reduction… | ||
| scan 098 | Brake test results for a starter motor. | ||
| View original record | MOTOR FORM 5. X.300-9 - BRAKE TEST OF STARTER MOTOR. Date:- 2.2.22. Motor under test:- R.R. Goshawk Dia. of brake wheel - 10" No:- 1. Weight of pan and portion of rope 5lbs. 0ozs. Reduction gear ratio… | ||
| scan 099 | Brake test report for a Goshawk starter motor. | ||
| View original record | MOTOR FORM 5. X.300-9 - BRAKE TEST OF STARTER MOTOR. Date:- 2.2.22 Motor under test:- R.R. Goshawk No. of brake wheel - 10" No:- 1 Weight of pan and portion of rope 5 lbs. 0 ozs. Reduction gear ratio… | ||
| scan 100 | Brake test results for a Goshawk starter motor. | ||
| View original record | MOTOR FORM 5. A.3009. BRAKE TEST OF STARTER MOTOR. Date:- 2-2-22 Motor under test:- Goshawk Dia. of brake wheel - 10" No:- 1 Weight of pan and portion of ropes = 5 lbs. 0 ozs. Reduction gear ratio -… | ||
| scan 101 | Brake test results for an R.R. Goshawk 2 starter motor with brushes 75% advanced. | ||
| View original record | MOTOR FORM 5. With brushes 75% advanced. 2 X.3009. BRAKE TEST OF STARTER MOTOR. Date:- 22.2.22. Motor under test:- R.R. Goshawk 2 Dia. of brake wheel - 10" No:- 2 Weight of pan and portion of rope= 4… | ||
| scan 102 | Brake test report for a R.R. Goshawk starter motor with brushes 75% advanced. | ||
| View original record | MOTOR FORM 5. With brushes 75% advanced X.3009. BRAKE TEST OF STARTER MOTOR. Date:- 22-2-22. Motor under test:- R.R. Goshawk Dia. of brake wheel - 10" No:- 2 Weight of pan and portion of rope= 4 lbs.… | ||
| scan 103 | Brake test results for an R.R. Goshawk starter motor with brushes fully advanced. | ||
| View original record | MOTOR FORM 5. With brushes fully advanced. X.3009. BRAKE TEST OF STARTER MOTOR. Date:- 24.2.22 Motor under test:- R.R. Goshawk Dia. of brake wheel - 10" No:- 2 Weight of pan and portion of rope = 4… | ||
| scan 104 | Brake test results for a R.R. Goshawk starter motor with brushes fully advanced. | ||
| View original record | MOTOR FORM 5. With brushes fully advanced X.3009 - BRAKE TEST OF STARTER MOTOR. Date:- 24.2.22 No:- 2 Motor under test:- R.R. Goshawk. Dia. of brake wheel:) 10 Weight of pan and portion of rope - 4… | ||
| scan 105 | Brake test results for an RR. Goshawk starter motor. | ||
| View original record | MOTOR FORM 5. 4 X. 3009 - BRAKE TEST OF STARTER MOTOR. Date:- 27.2.22. Motor under test:- RR. Goshawk. Dia. of brake wheel:) 10" No:- 4 Weight of pan and portion of rope = 4 lbs. 7 1/2 ozs. Reduction… | ||
| scan 106 | Brake test report for an RR Goshawk starter motor. | ||
| View original record | MOTOR FORM 5. Brushes 3.5° advanced from neutral. (75%) 4 X. 3009 - BRAKE TEST OF STARTER MOTOR. Date:- 9. 3. 22 Motor under test:- RR Goshawk Dia. of brake wheel:) 10 No:- 4 Weight of pan and portion… | ||
| scan 107 | Test results for a torque of 66 lb inches under various conditions. | ||
| View original record | Torque of 66 lb inches Gohawk S.O. 4929. Sh. V (II). (Bdg) A.972. M.D. Column 1: No. 1, 50% adva Amperes: 141 Volts: 9.18 Speed: 630 B.H.P.: .66 E.H.P.: 1.73 Eff: .381 Column 2: No. 2, 75% adv.… | ||
| scan 108 | Use of an existing crankshaft diameter and balance weights, weighing advantages against the risk of torsional vibration. | ||
| View original record | R.R. 235 A (150 11) (V.V. 585. 23.2.12) G. 0363. Mr Hives To Wor. for EH. from R. Copy to J. Copy to E. Copy to Na. X. 68. R13/P 16.3.14. There is no need to test the large and small diameter of… | ||
| scan 109 | Graph showing the brake efficiency and performance characteristics of a Zenith starter motor during a brake test. | ||
| View original record | STARTER MOTOR BRAKE EFFICIENCY REF. No. Z.S.710.B/4 DATE. 3.5.21 ZENITH STARTER ON BRAKE TEST Armature. No. 1. AXES LABELS AND SCALES: VERTICAL AXES (from top to bottom): R.P.M: 3000, 2700, 2400,… | ||
| scan 110 | Blank graph for plotting Starter Motor Brake Efficiency and performance characteristics. | ||
| View original record | STARTER MOTOR BRAKE EFFICIENCY TORQUE (POUND INCHES) 0 10 20 30 ELECTRICAL H.P. 0 4 8 12 16 20 24 28 32 36 40 EFFICIENCY 0 .1 .2 .3 .4 .5 .6 .7 .8 .9 1.0 VOLTAGE 0 2 4 6 8 10 12 14 16 18 20 AMPERES 0… | ||
| scan 111 | Brake test of a starter motor. | ||
| View original record | MOTOR FORM 5. Brushes 7° advance 5 X.3009 - BRAKE TEST OF STARTER MOTOR. Date:- 7.3.22 Motor under test:- R.R. Goshawk Dia. of brake wheel:) 10" No:- 5 Weight of pan and portion of rope = 4lbs. 14ozs.… | ||
| scan 112 | Brake test report for a Goshawk starter motor. | ||
| View original record | MOTOR FORM 5. Brushes 7° advance 6 X.3009 - BRAKE TEST OF STARTER MOTOR. Date:- 7.3.22 Motor under test:- R.R. Goshawk Dia. of brake wheel:- 10" No:- 6 Weight of pan and portion of rope 4 lbs. 14 ozs.… | ||
| scan 113 | Brake test results for a Goshawk starter motor with brushes 3° advanced. | ||
| View original record | MOTOR FORM 5. With brushes 3° advanced 6 X.3009 - BRAKE TEST OF STARTER MOTOR. Date:- 9.3.22 Motor under test:- R.R. Goshawk Dia. of brake wheel:- 10" No:- 6 Weight of pan and portion of rope 4 lbs.… | ||
| scan 114 | Brake test report for a Goshawk starter motor. | ||
| View original record | MOTOR FORM 5. X.3009 - BRAKE TEST OF STARTER MOTOR. 6 Date:- 11.3.22. Motor under test:- R.R. Goshawk Dia. of brake wheel:- 10" No:- 6 Weight of pan and portion of rope 4 lbs. 14 ozs. Reduction gear… | ||
| scan 115 | Record of tests carried out on a Goshawk motor, detailing brush position adjustments and results. | ||
| View original record | X.4384 X.4384 - RECORD OF TESTS, CARRIED OUT ON GOSHAWK MOTOR. | No. | Date recd | Work carried out. | Present location. | Brush position on car. | Remarks. | |---|---|---|---|---|---| | 1. Not… | ||
| scan 116 | Instructions detailing points to be noted in the production of R.R.S. motors. | ||
| View original record | RR 238 (300 Bks.) (SF 152. 6-11-18.) MP 197880 X. 4384. ROLLS-ROYCE LIMITED. INSTRUCTIONS. March 25th 1922 To E.F.C. Order No. P.B. 37 Customer's No. X 3534 Points to be Noted in the Production of… | ||
| scan 117 | List of instructions regarding the insulation and connections of brushes, terminals, and field coils. | ||
| View original record | RR 258 (300 Bks.) (SF 152. 6-11-18.) MP 197880 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To E.F.C. Order No P.B. 37 Customer's No. X3534 ⑤ The insulation on the pigtails of the two insulated brushes should… | ||
| scan 118 | Table listing the dynamo, motor, and battery specifications for various Goshawk chassis. | ||
| View original record | X. 4384 EFC/T26.4.22. DYNAMOS, MOTORS AND BATTERY ON VARIOUS GOSHAWK CHASSIS. Dynamo. Motor. Battery. 1 Goshawk II. open-touring. C.A.V. Lucas. C.A.V.Willard 12XR3/3. 2 Gos.II EP's car. C.A.V. C.A.V.… | ||
| scan 119 | Bench test results for the R.R. Goshawk starter motor. | ||
| View original record | X4384 To R. & E. from EFC. c. to CJ. & PN‡ c. to By. & EP. c. to Rg. & Da. EFC1/T14.7.22. X.4384 - R.R. GOSHAWK STARTER MOTOR. The results of bench tests carried out on the first R.R. Goshawk starter… | ||
| scan 120 | Comparing the performance of different starter motors for the Goshawk engine. | ||
| View original record | Contd. EFC1/T14.7.22. This may be somewhat different when only a magneto is fitted. From this we judged that our assumed torque required to turn the Goshawk engine at 500 lb-inches was, even though it… | ||
| scan 121 | Graph of speed-torque and ampere-torque curves for R.R. CAV and Lucas starter motors for the Goshawk chassis. | ||
| View original record | SPEED-TORQUE AND AMPERE-TORQUE CURVES OF R.R. CAV AND LUCAS STARTER MOTORS FOR GOSHAWK CHASSIS. Left Y-Axis: AMPERES Right Y-Axis: SPEED (R.P.M) X-Axis: TORQUE (LB-INS) Curve Labels: AMPERES SPEED… | ||
| scan 122 | Mostly blank document with a 'Print Room' date stamp. | ||
| View original record | ROLLS-ROYCE, LIMITED PRINT ROOM. 19 JUL. 29 | ||
| scan 123 | Proposal to make and test a Goshawk dynamo and starter motor with solid field poles. | ||
| View original record | To R. from RFC. c. to W. c. to E. c. to Ry. X.4384 FC4/T14.7.22. X.4383. GOSHAWK DYNAMO. X.4384. GOSHAWK STARTER MOTOR. We propose to have made up a Goshawk dynamo and a starter motor, each machine to… | ||
| scan 124 | Satisfactory performance and efficiency of the Goshawk starter motor compared to competitors. | ||
| View original record | X.4384. To EFC. from R. c. to CJ. Wor. c. to Rg. By. c. to Da. PN. c. to EP. F1/M27.7.32. X.4384 - GOSHAWK STARTER MOTOR Many thanks for your memo. and diagrams of curves of the RR. C.A.V. and Lucas… | ||
| scan 125 | Specification for the inspection and testing of a Goshawk starter motor. | ||
| View original record | X4384 19.8.22. ++ X.3604sm - R.R. GOSHAWK STARTER MOTOR. X.4384. SPECIFICATION OF INSPECTION AND TEST. Preliminary Insulation Test and Inspection. (a) Lift the opposite pair of earthed brushes (two… | ||
| scan 126 | Procedure for conducting a light test on a motor to check mechanical friction and magnetic circuit integrity. | ||
| View original record | -2- Contd. TEST 1. LIGHT TEST. The motor shall be run light for a period of half an hour on a battery of three accumulator cells in series. Towards the end of the run the current taken must not exceed… | ||
| scan 127 | Procedure detailing the 'Load Test' (Test 2) for a motor. | ||
| View original record | -3- Contd. TEST 2. LOAD TEST. The motor, loaded up by means of a brake, shall now be run from a 12 volt battery of ample capacity, the brake torque being adjusted until the current taken is 100± 1.… | ||
| scan 128 | Continued page of a technical document explaining the effects of circuit resistance and bad magnetic circuits on motor speed during testing. | ||
| View original record | -4- Contd. resistance of the circuit is subtracted from the available E.M.F., it being noted that the current remains very nearly the same for a given torque independently of volts and speed. On the… | ||
| scan 129 | Test procedures for an intermittent load test and inspection notes for motor commutators and brushes. | ||
| View original record | TEST 3. -5- 19.8.22. INTERMITTENT LOAD TEST. (This test will consist of switching the motor on and off intermittently under load (about 10 secs. on and 10 secs. off) for a period of 3 minutes). During… | ||
| scan 130 | Electrical insulation breakdown and resistance testing procedures. | ||
| View original record | -6- this latter is equally good. Therefore, during the load test each brush in rotation should be lifted off the commutator and the effect observed on the ammeter and opposite brush. TEST 4.… | ||
| scan 131 | From EFC to Mr. Brock requesting the weights of various components for the R.R. Goshawk starter motor. | ||
| View original record | To Mr. Brock. from EFC. X 4384 EFC2/T119.22. X. 4384 - R.R. GOSHAWK STARTER MOTOR With reference to the above, would you kindly let me know at your convenience :- (1) The bare weight of carcase and… | ||
| scan 132 | Production test checklist for a Goshawk starter motor. | ||
| View original record | X.4384. 20.11.22. X.3604 - GOSHAWK STARTER MOTOR PRODUCTION TEST X.4384. First inspection. Insulation. Boxes radial. " axial. Brush spacing. Brush freedom. " circumferential fit. Brush bedding.… | ||
| scan 133 | Recommending the replacement of the Bendix starter motor pinion with a superior Bijur type for the Goshawk project. | ||
| View original record | X4384 To EY. from R. c. to CJ. c. to BJ. c. to Wor. c. to Hs. c. to Da. c. to EP. X.3592. - RE GOSHAWK X.4384. We have now altered the starter motor and embodied a Bijur type of pinion in place of the… | ||
| scan 134 | Intense testing procedure for an altered Goshawk starter motor. | ||
| View original record | To EY. from DJ. Copy to Hs. P.N. X438H DJ/HS.15.12.22. RE GOSHAWK. With reference to K1/M/1.12.22, concerning the alteration to starter/motor, I presume that this will be immediately tested in the… | ||
| scan 135 | Confirming the arrangement to mark dynamos and motors on experimental Goshawk chassis. | ||
| View original record | X4384 To RHC. from EFC. EFCK/T7.12.22. RE MARKING OFF OF GOSHAWK DYNAMOS AND MOTORS ON CHASSIS. X4383 X4384 This is to confirm that as arranged in conversation you will have the motors and dynamos on… | ||
| scan 136 | Adoption of the Bijur Bendix starter motor for a 20 HP engine. | ||
| View original record | X4384 To BJ. from Hs. c. to EY. c. to FH. Hs1/LGS.12.22. X3592 BIJUR BENDIX FOR 20 HP. STARTER MOTOR. X4384 With reference to your BJ3/H5.12.22. The Works have been instructed to hold up on the parts… | ||
| scan 137 | Examination report on a faulty starter motor from car 2G-II, detailing the issues found and the repairs made. | ||
| View original record | X4384 EFC 68 X.4384 X 4069 STARTER MOTOR FROM 2G-II. The starter motor from 2GII (school-car) marked 6 (or 9) was received for examination, from Mr. Warwick, on Thursday the 18th inst. Of the… | ||
| scan 138 | Brake test report for a Standard Goshawk starter motor. | ||
| View original record | MOTOR FORM 5. X 4354 X.3009 - BRAKE TEST OF STARTER MOTOR. X.4384 Date:- 26.4.23. Motor under test:- Std. Goshawk. Dia. of brake wheel:- 10" No.:- Weight of pan and portion of Rope - lbs. ozs.… | ||
| scan 139 | Investigation into the suitability of adapting a Goshawk starter motor to an E.A.C. engine, with related E.M.F. calculations. | ||
| View original record | To E. from EFC. c. E/Mr. Stent. X4384 EFCL/T5.5.23. RE E.A.C. & GOSHAWK STARTER MOTORS. X4384 X9620 Having investigated the suitability of adaptation of the Goshawk starter motor to the E.A.C. engine,… | ||
| scan 140 | Calculations and considerations regarding polar flux density for Goshawk and E.A.C. motors. | ||
| View original record | -2- Contd. A polar flux density (reckoned on the minimum pole face) of 6,000 to 7,500 lines per cm2 is about right. Taking 6,500 lines per cm2, Ø for the Goshawk motor is 161,000 lines, and for the… | ||
| scan 141 | Motor flux density and its effect on performance, with calculations for a Goshawk motor. | ||
| View original record | -3- Contd. By reducing the flux density to 6,000 we bring this down to 2.33 x 10^10, but to bring it down to the major limit would necessitate a flux density as low as 5780. This would require so few… | ||
| scan 142 | Calculations and discussion on the number of conductors required for E.A.C. and Goshawk starter motors. | ||
| View original record | -3- Contd. higher, so that we are led to the conclusion that the number of conductors requires increasing. Fixing, as we do, the speed N = 1760, and taking a suitable flux density of 6500 in each… | ||
| scan 143 | Calculations for an E.A.C. starter motor based on given data. | ||
| View original record | X.9620 - E.A.C. STARTER MOTOR. (Calculations based on data given). Torque required to turn E.A.C. engine - 900 lb-inches (say) Speed reduction ratio = 32 Taking 85% gearing efficiency effective torque… | ||
| scan 144 | Page of calculations for an electric motor, including flux, conductors, and EMF. | ||
| View original record | -2- Contd. Length = 2.75" - 69.9 mm. Useful flux per pole = 5600 x 6.99 x 4.27 = 167000 lines. Number of conductors = Tb x 10^8 / 1.41 P Ø C = 36.4 x 2 x 10^8 / 1.41 x 4 x167000 x 108 = 71.6 No. of… | ||
| scan 145 | Calculations for the resistance and cross-sectional area of an armature turn. | ||
| View original record | -3- Contd. Assumed { RA = .0100 ohm Approx. { RP = .0115 " division. { RB = .0025 " Resistance of one armature turn = (.0100 x 4) / 37 = .00108 ohm. Length of armature turn = 11" approx. Resistance… | ||
| scan 146 | Page of calculations for slot and teeth dimensions, including area, depth and width. | ||
| View original record | -4- Contd. Take copper space efficiency of 50% (say) Then slot area = 4 x .00692 = .02768 sq.inches. Total area of all slots = 1.02 sq. inches (A) Maximum slot depth h = √(A/2π) = √(1.02/6.28) = √.162… | ||
| scan 147 | Table of calculations for the ampere turns necessary to produce the required magnetic flux. | ||
| View original record | AMPERE TURNS NECESSARY TO PRODUCE FLUX REQUIRED Part. | Matl. | Length ("). | Virtual section (sq.ins). | Total Flux. | Flux density Inch units. | Cg. units. | H. | AT. per inch. | A.T. --- | --- |… | ||
| scan 148 | Page of calculations for field winding resistance, cross-sectional area, and equivalent wire gauge. | ||
| View original record | -6- Ampere turns required = 300 Amperes = 108 .. No of turns. - 3 Length of mean turn 9¼" approx. Therefore total length of field strip • 4 x 3 x 9¼ + 9 say • 123" Estimated resistance for field… | ||
| scan 149 | Calculations for adapting a Goshawk size starter motor for an E.A.C. engine. | ||
| View original record | 1-1 30.4.23. X.9620 - E.A.C. STARTER MOTOR. (Calculations for adaptation of Goshawk size of motor to this work) Torque required to turn E.A.C. engine = 900 lb-inches (say) Speed reduction ratio = 32… | ||
| scan 150 | Page of calculations relating to useful flux per pole and the number of conductors. | ||
| View original record | -2- Contd = 5/29 x π x 2.850 = 1.54" = 39 mm. Length = 2.50" = 63.5 mm. This gives a useful flux per pole of 6500 x 6.35 x 3.9 = 161,000 Number of conductors = Tb x 10⁸ ------------ 1.41 P Ø C = 36.4… | ||
| scan 151 | Performance graph showing the brake efficiency characteristics of a standard starter motor for the R.R Goshawk engine. | ||
| View original record | STARTER MOTOR BRAKE EFFICIENCY X.3009 R.R GOSHAWK STANDARD MOTOR X4384 ELECTRICAL H.P. EFFICIENCY VOLTAGE AMPERES B.H.P. R.P.M. TORQUE (POUND INCHES) EFFICIENCY VOLTS B.H.P AMPERES E.H.P SPEED | ||
| scan 152 | Blank document page with a date stamp and a handwritten reference number. | ||
| View original record | ROLLS-ROYCE, LIMITED PRINT ROOM. 12 FEB. 25 DERBY X4374 | ||
| scan 153 | Trouble with starter motor pole stampings on the 20 HP chassis. | ||
| View original record | X4384 To EFC. BY/RD2/ML18.11.25. RE 20 H.P. CHASSIS - STARTER MOTOR. We have experienced trouble with the pole stampings on this motor and took the matter up with the makers and the following is a… | ||
| scan 154 | Confirming there are no electrical objections to using thinner stampings for the HE 20 HP starter motor. | ||
| View original record | To EY/RD. from EFC. X4384 EFC2/T18.11.25. HE 20 HP. STARTER MOTOR X4384 Answering your EY/RD2/ML18.11.25, there are no electrical objections to using thinner stampings, and I have no objection to… | ||
| scan 155 | Table of chassis starter rolling condition figures for the 20 HP model, comparing Standard, Lucas, and C.A.V. motors. | ||
| View original record | X 4584 CHASSIS STARTER ROLLING CONDITION FIGURES. 20 HP. MOTOR. Standard 20 HP. Design. | Actual. | Lucas. | C.A.V. ENGINE TORQUE. | 560 | 500 | 500 | 500 GEAR RATIO. | 8.4 | 8.4 | 8.4 | 8.4 MOTOR… | ||
| scan 156 | Calculations for a 20 HP starter motor. | ||
| View original record | X.4384 4.7.28 X.4384. NEW ASPECT OF CALCULATIONS FOR 20 H.P. STARTER MOTOR, DATED 1.7.21. Engine 500 lb-inches. 96.5 r.p.m. On conductors:- 610 lb-inches at 96.5 r.p.m. or at 8.4 : 1 ratio 72.7… | ||
| scan 157 | Cross-reference note for correspondence regarding the 20 HP starter motor. | ||
| View original record | X.4384. For further correspondence in connection with 20 HP. starter motor, see X.5620. EFC. | ||
| scan 158 | Cover letter enclosing a circular and pamphlet for a Tungstone Accumulator and requesting an opinion on it. | ||
| View original record | EFC. from Wd. X3810 Wd1/NJ1.12.25. Tungstone Accumulator. Herewith I send you a circular and pamphlet from Tungstone Accumulator Co.Ltd., 3, St.Bride's House, Salisbury Square, E.C.4, which is the… | ||
| scan 159 | Advertisement and trade notice for the Tungstone Accumulator, detailing product specifications, performance, and price/discount conditions. | ||
| View original record | X 2830 TELEGRAMS: 'TYPIFY, FLEET, LONDON.' TELEPHONE: CENTRAL 8157 (3 LINES). SERIES OF PATENTS DESIGNS & TRADE MARK ISSUED OR APPLIED FOR IN THE CHIEF COUNTRIES OF THE WORLD. BRITISH ORIGIN AND… | ||
| scan 160 | Tungstone accumulators and postponing investigation pending further reports. | ||
| View original record | V3830 To Wd. from EFC. EFC5/T4.12.25. RE TUNGSTONE ACCUMULATORS. Answering your Wd1/NJ1.12.25. The information about the accumulator is certainly very interesting, and it would appear to possess… | ||
| scan 161 | Correspondence with the Tungstone Accumulator Co. Ltd. regarding battery life and performance testing. | ||
| View original record | EFC. from Wd. Wd7/NJ9.12.25. Re Tungstone Accumulators. Upon receipt of yours EFC5/T4.12.25, we wrote the Tungstone Accumulator Co.Ltd. informing them that we found the information given in their… | ||
| scan 162 | Request to obtain a single cell from a Tungstone battery for examination due to its unique construction. | ||
| View original record | X830 To Wd. from EFC. EFC6/T15.12.25. RE TUNGSTONE BATTERIES. ------------------------- Considering this matter further we think that before having a complete 12 volt type 12449 L.T. standard car… | ||
| scan 163 | Letter forwarding a reply from the Tungstone Accumulator Co. for consideration. | ||
| View original record | EFC.from Wd. X3830 Wd7/NJ21.12.25. Tungstone Accumulator. Upon receipt of yours EFC6/T15.12.25, we wrote the Tungstone Accumulator Co. as per copy attached and I now send you copy of said firm's reply… | ||
| scan 164 | Letter to Tungstone Accumulator Co. Ltd. requesting a sample battery cell for examination. | ||
| View original record | Wd4/NJ161225. COPY. 16th Dec.1925. Messrs.Tungstone Accumulator Co.Ltd., 3, St.Bride's House, Salisbury Square, London, E.C.4. Dear Sirs, We duly received yours ref.- WH/AD, of 8th inst. From your… | ||
| scan 165 | Letter from Tungstone Accumulator Co. Ltd. offering a 12-volt battery on loan for practical testing. | ||
| View original record | Copy of letter from:- TUNGSTONE ACCUMULATOR CO.LTD., 3, St.Bride's House, Salisbury Square, London, E.C.4. WH/AD. December 18th 1925. Messrs.Rolls-Royce Ltd., Derby. For the attention of Mr.Whitehead.… | ||
| scan 166 | Correspondence regarding the potential testing of a Tungstone accumulator battery. | ||
| View original record | X3830 To Wd. from EFC. EFC4/T22.12.25. X.3830 - TUNGSTONE ACCUMULATOR. Yours Wd7/WJ21.12.25. We have carefully read the letter from the Tungstone Accumulator Co., but we still think it would be to our… | ||
| scan 167 | Continued memorandum page discussing the desired behavior of a component, comparing it to a water tank. | ||
| View original record | Contd. -2- EFC4/T22.12.25. which will, over a period of several years, behave like a water tank which, whilst having a definite and known capacity, suffers no harm due to an overflow, is what we want.… | ||
| scan 168 | 2-volt Tungstone Accumulator cell received on loan. | ||
| View original record | EFC. from Wd. c. to Dn/Dn [Text is crossed out] c. to Mt/Aft [Text is crossed out] X3830 Wd10/NJ31.12.25. X.3830 - Tungstone Accumulator. In response to yours EFC4/T22.12.25, the Tungstone Accumulator… | ||
| scan 169 | Instructions for the re-examination of a Tungstone cell, detailing its disadvantages in weight and dimensions. | ||
| View original record | RR 300 (20 Bks.) (SK 354 5-12-22 MP 264049) X7830 108718 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: C.T.B. Order No.: Re: J.B.146. Customer's No.: 3820 Date: 18-1-1926 Re Examination of Tungstone cell.… | ||
| scan 170 | Instructions regarding the estimated weight, dimensions, and internal resistance of a battery cell. | ||
| View original record | RR 300 (20 Bks.) (SK 354 5-12-22 MP 264049) 108719 ROLLS-ROYCE LIMITED. INSTRUCTIONS. II To Order No. Customer's No. Re J.B.146. hour battery is estimated to be 77 lbs dry & with acid would be in the… | ||
| scan 171 | Instructions and results for a Tungstone cell capacity test. | ||
| View original record | RR 300 (20 Bks.) (SK 354 5-12-22 MP 264049) V3830 108720 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To E.F.B. 20-1-1926 Order No. Customer's No. Re JB. 148. Re Tungstone cell capacity test. This cell was… | ||
| scan 172 | The disadvantages of a Tungstone sample cell, focusing on its weight, dimensions, and potential for leakage. | ||
| View original record | XJ830 To Wd. from EFC. c. BY. EFC6/T20.1.26. X.3830 - TUNGSTONE CELL. ----------- Quoting in the main from my assistant's report, the following are our remarks as regards the sample cell which we have… | ||
| scan 173 | Technical analysis of battery cell leakage, performance, and design considerations. | ||
| View original record | Contd. -2- EF05/T20.1.26. leak electrically because of the charging effect of the leak current on the metal surfaces involved. nevertheless it can scarcely be doubted that cells do leak in this… | ||
| scan 174 | Continued memorandum on the testing of a new battery cell against standard cells, noting its unsuitable weight and dimensions. | ||
| View original record | Contd. -3- EFC6/T20.1.26. We shall, however, be making with this cell the usual tests which we make on complete batteries with a view to finding out these points definitely, and also as to whether the… | ||
| scan 175 | Promotional letter from Tungstone Accumulator Co., Ltd. regarding their batteries for car lighting and starting. | ||
| View original record | XJ830 TELEGRAMS: "TYPIFY, FLEET, LONDON." TELEPHONE: CENTRAL 8157 (3 LINES). SERIES OF PATENTS DESIGNS & TRADE MARK ISSUED OR APPLIED FOR IN THE CHIEF COUNTRIES OF THE WORLD. BRITISH ORIGIN AND… | ||
| scan 176 | Requesting an opinion on Tungstone Accumulators. | ||
| View original record | S/W. To EFC. X3830 H/AJB2/B26126. TUNGSTONE ACCUMULATORS. I have been asked by the Managing Director of the Company responsible for the above who is a personal friend of mine to bring same to the… | ||
| scan 177 | From EFC to AJB detailing the disadvantages and advantages of the Tungstone Battery. | ||
| View original record | 13830 W/S. EFC1/T27.1.26. To AJB. from EFC. X. 3330 - TUNGSTONE BATTERY. Answering your H/AJB3/H26.1.26, the first big disadvantage of the Tungstone battery is its great weight-capacity ratio, which… | ||
| scan 178 | Correspondence with Tungstone Accumulator Co. Ltd. regarding their Tungstone Cell battery. | ||
| View original record | VJ830 EFC.from Wd. Wd4/NJ2.2.26. X.3830 - Tungstone Cell. Upon receipt of EFC6/T20.1.26, we wrote Tungstone Accumulator Co.Ltd. giving them a very full extract from your note and I now attach copy of… | ||
| scan 179 | Letter from a battery supplier discussing the weight, dimensions, and construction of their accumulator. | ||
| View original record | COPY OF LETTER FROM:- THE TUNGSTONE ACCUMULATOR CO.LTD. 3, St.Bride's House, Salisbury Square, Fleet St, LONDON.E.C.4. Our Ref.Wm.H./R.B. 29th January 1926. Messrs. Rolls-Royce Ltd., D E R B Y. Dear… | ||
| scan 180 | Letter from Tungstone Accumulator Co., Ltd. concerning battery leakage and specifications for 20 HP cars. | ||
| View original record | Sheet No.2. discussion; but we would just like to point out that for such leakage we must be in the same category as other makers, namely, when the battery is under charge the conducting electrolyte… | ||
| scan 181 | Instruction sheet detailing the results of a capacity test on a Tungstone cell. | ||
| View original record | RR 238 (180 BKS.) (DB 461-8-12-24) MP 306975 X3830 ROLLS-ROYCE LTD. INSTRUCTIONS. To: E.F.B. Order No.: J.C. 5. Customer's No.: Date: 2-2-1926 Re Tungstone Cell. Capacity Test. This cell on its… | ||
| scan 182 | Testing and durability of a Tungstone Cell from the Tungstone Accumulator Company. | ||
| View original record | X3830 To Wd. from EFC. EFC3/T6.2.26. X.3830 - Tungstone Cell. I have duly noted the contents of the letter dated 29th ult. ref. Wm.H/R3. from The Tungstone Accumulator Company, and I could give… | ||
| scan 183 | Article reprinted from 'The Motor' magazine detailing the testing of a new design of Tungstone accumulator battery. | ||
| View original record | X. 3830. Reprinted from The Motor January 26, 1926. Testing the Tungstone Battery. New Design of Accumulator Tried Under Very Stringent Conditions. An article describing the results obtained with a… | ||
| scan 184 | Leakage test conducted on a Tungstone Bell cell. | ||
| View original record | R.S 238 (150 BKS.) (DS 431-0 12 24) MP J00975 X 3830 ROLLS-ROYCE LTD. INSTRUCTIONS. To: E.C.B. Date: 11-2-1926 Order No.: J.C.S. Customer's No.: Re Tungstone Bell leakage test. This cell was fully… | ||
| scan 185 | Instruction sheet detailing the failure of a Tungstone cell due to badly buckled plates, deeming it useless. | ||
| View original record | RR 238 (180 BKS.) (09 431-B 12 24) MP JC6975 X3830 ROLLS-ROYCE LTD. INSTRUCTIONS. To: E.F.B. Order No.: J.C.21. Customer's No.: Date: 20 - 4 - 1926 Re Tungstone cell The positive plates of this cell… | ||
| scan 186 | The return of a faulty sample Tungstone cell due to buckled positive plates. | ||
| View original record | To Wd. from EFC, X3830 EFC3/T23.4.26. Herewith we hand to you for return to the makers, package containing in a now dry condition the sample Tungstone cell which we recently had. We do not think we… | ||
| scan 187 | Instructions detailing the re-examination of a Tungstone Cell, noting its construction and issues with loose negative plates. | ||
| View original record | RR 238 (180 BKS.) (DB 461-8-12-24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. X3830 To E.F.G. 7 - 6 - 1926 Order No. J.B. 33 Customer's No. X3830 Re examination of Tungstone Cell. This cell appears to… | ||
| scan 188 | The approximate weight of a 12-volt battery and its crate. | ||
| View original record | RR 298 (100 BKS.) (DB 431-9 12 24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. II 19 To Order No. J.C.33. Customer's No. Its approx weight filled with acid would be in the neighbourhood of 100 lbs with… | ||
| scan 189 | The examination and return of a faulty Tungstone cell. | ||
| View original record | To Wd. from EFC. c. Despatch Stores. XJ830 EFC4/T10.6.26. X.3830. TUNGSTONE CELL We have recently received and examined a further Tungstone cell as arranged with the Tungstone representatives at the… | ||
| scan 190 | Letter from The Chloride Electrical Storage Company regarding Tungstone Accumulator's claims about pure lead plate grids. | ||
| View original record | X3830 ALL COMMUNICATIONS TO BE ADDRESSED TO THE COMPANY THE Chloride ELECTRICAL STORAGE COMPANY LIMITED. LONDON OFFICE, 137, VICTORIA STREET, S.W.1. CLIFTON JUNCTION. NR MANCHESTER. TELEPHONES -… | ||
| scan 191 | Letter discussing the materials and construction of accumulator grids, comparing pure lead, antimonial lead, and the Tungstone accumulator. | ||
| View original record | X3830 EFCL/T. 18th Sept. 1926. Mr. E.C. McKinnon, Clifton Junction, Nr. Manchester. Dear Mr. McKinnon, I have your letter ECM/EH of the 17th inst. but before taking up this matter, I feel that there… | ||
| scan 192 | Letter discussing the comparative performance of battery cells, mentioning tests on separators, plates, and leakage. | ||
| View original record | EFC1/T -2- Contd. separators must necessarily be capable in the early days of its life of a better performance in certain directions. We did test a cell but found the positive plates to buckle so… | ||
| scan 193 | Letter from Chloride Electrical Storage Co. Ltd. discussing the composition of Tungstone accumulator grids and plates. | ||
| View original record | X3830 ALL COMMUNICATIONS TO BE ADDRESSED TO THE COMPANY THE Chloride ELECTRICAL STORAGE COMPANY LIMITED. LONDON OFFICE, 137, VICTORIA STREET, S.W.1. CLIFTON JUNCTION. NR MANCHESTER. TELEPHONES -… | ||
| scan 194 | Letter to Mr. E.C. McKinnon clarifying a misunderstanding about the material composition of lead accumulator grids. | ||
| View original record | XJ830 EFC2/T. 21st Sept., 1926. Mr. E.C.McKinnon, Messrs. The Chloride Elec. Storage, Co.Ltd., Clifton Junction, Nr. Manchester. Dear Mr. McKinnon, Re Tungstone Accumulator. I have your letter ref.… | ||
| scan 195 | Letter from The Chloride Electrical Storage Company Limited clarifying a misunderstanding regarding the term 'pure lead' for Tungstone Accumulator components. | ||
| View original record | X3830 ALL COMMUNICATIONS TO BE ADDRESSED TO THE COMPANY THE Chloride ELECTRICAL STORAGE COMPANY LIMITED. LONDON OFFICE: 137, VICTORIA STREET, S.W.1. CLIFTON JUNCTION, NR MANCHESTER. TELEPHONES -… | ||
| scan 196 | Letter to Mr. E.C. McKinnon of The Chloride Elec. Storage Co. Ltd. regarding a misunderstanding about the Tungstone Battery. | ||
| View original record | X3830 23rd September, 1926. EFC/T. Mr. E.C. McKinnon, Messrs. The Chloride Elec. Storage Co.Ltd., Clifton Junction, Nr. Manchester. Dear Mr. McKinnon, Re Tungstone Battery. Thank you for yours of… | ||
| scan 197 | List of points on why the Tungstone battery is considered inferior to other makes. | ||
| View original record | RR 238 (150 BKS.) (DB 461-8-12 24) MP 306975 X 3830 ROLLS-ROYCE LTD. INSTRUCTIONS. To: C.T.C. Order No.: J.C.128. Customer's No.: X 3830 Re Points on why the Tungstone is inferior to other makes of… | ||
| scan 198 | Instruction note critiquing a replacements scheme, emphasizing durability over unproven revolutionary claims. | ||
| View original record | ROLLS-ROYCE LTD. INSTRUCTIONS. II. RR 236 (150 BKS.) (DD 431-8 12 24) MP 306975. To. Order No. J.C.128. Customer's No. replacements scheme & seem to forget or ignore the fact that durability should… | ||