From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
List of engineering modifications and their status for the Spectre 12-Cylinder engine.
| Identifier | ExFiles\Box 30\3\ Scan065 | |
| Date | 19th January 1935 | |
| - 14 - BY.1/G.19.1.35. SPECTRECodename for Phantom III 12-CYL. ENGINE. N.Sch.4300 Modn. to Clutch Rear Bearing .............. Recd.14.12.34. Detail drawings completed and issued ........ 11.1.35. N.Sch.4307 Modified Ferrule in Front Apron ............ Recd.28.12.34. Detail drawings completed and issued ........ 28.12.34. N.Sch.4308 Water Drain Holes in Frame ................ Recd.28.12.34. Detail drawings completed and issued ........ 28.12.34. N.Sch.4310 Modification to Pedals .................... Recd.28.12.34. Detail drawings completed and issued ........ 7.1.35. N.Sch.4311 Rear Brakes Intermediate Levers ............ Recd.28.12.34. Detail drawings are in hand. N.Sch.4313 Modn. to Foot Brake Countershaft Lever ..... Recd.29.12.34. Detail drawings are in hand. N.Sch.4316 Revised Upper Triangle Lever with provision for adjusting castor angle ..I.F.W.S.......... Recd.3.1.35. N.Sch.4317 Revised Lower Triangle Lever with provision for adjusting Castor angle I.F.W.S. ......... Recd.3.1.35. N.Sch.4318 Modified Front Brake Operating Linkage ...... Recd.3.1.35. N.Sch.4322 Wing Stay Support ........................ Recd.3.1.35. Detail drawings will be put in hand as soon as possible. N.Sch.4320 Modfns. to 2nd. Speed Permanent Scheme ...... Recd.3.1.35. Detail drawings are in hand. N.Sch.4321 Needle Roller Bearings for gears to reduce drag in Gearbox ................................ Recd.3.1.35. Detail drawings are in hand. N.Sch.4325 Steering Column Support Brkt. & Gastight Seal in Floorboards with Marles Type Steering ~ 'E' Steering .............................. Recd.3.1.35. N.Sch.4329 Strengthened Yoke Piece & Pivot Pin. I.F.W.S. Recd.3.1.35. N.Sch.4331 Frame Test Pieces ........................ Recd.9.1.35. Detail drawings will be put in hand as soon as possible. N.Sch.4326 Gears for .37 1st. Speed ................. Recd.3.1.35. Detail drawings completed and issued ........ 9.1.35. N.Sch.4327 Layout of Servo Brake Rods on Semi-Servo System.Recd.5.1.35. Detail drawings are in hand. | ||