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 drawing schedules and their status for the Spectre 12-Cylinder engine.
| Identifier | ExFiles\Box 133\4\ scan0042 | |
| Date | 12th June 1935 | |
| - 11 - SPECTRECodename for Phantom III 12-CYL. ENGINE. N.Sch.4401 Side Steering ......................... Recd. 14.3.35. Detail drawings completed and issued ........ 19.3.35. N.Sch.4402 Stiffened Idler Lever - Front Brakes ...... Recd. 7.3.35. Detail drawings completed and issued ........ 3.4.35. N.Sch.4403 Geometry of Front Brake Pull Rod .......... Recd. 7.3.35. Detail drawings completed and issued ........ 16.3.35. N.Sch.4404 Increased Clutch Pedal Travel ............ Recd. 14.3.35. Detail drawings completed and issued ........ 4.4.35. N.Sch.4405 Gearbox - Ball Bearings in place of Roller Bearings. Temporary Scheme ............... Recd. 8.3.35. Detail drawings completed and issued ........ 30.3.35. N.Sch.4407 Side Steering Lever ..................... Recd. 9.3.35. Detail drawings completed and issued ........ 22.3.35. N.Sch.4421 Modified Side Steering Sockets ........... Recd. 15.3.35. Detail drawings completed and issued ........ 19.3.35. N.Sch.4423 Stay to Brake Countershaft - Foot Brakes.... Recd. 19.3.35. Superseded by N.Sch.4437. N.Sch.4414 Gearbox - Pressure Angles to give Cadillac Loading ................................ Recd. 12.3.35. Detail drawings completed and issued ........ 8.4.35. N.Sch.4427 Higher Rating Springs for Progressive Spring System. I.F.W.S. ....................... Recd. 23.3.35. Detail drawings completed and issued ........ 30.5.35. N.Sch.4428 Disc Type Damper for Servo Suspension Bracket. Recd. 2.4.35. Detail drawings completed and issued ........ 22.5.35. N.Sch.4431 Additional Views and Lightened Rocker Shaft - Marles Steering .......................... Recd. 29.3.35. Detail drawings completed and issued ........ 15.4.35. N.Sch.4434 C/W. 3rd and 2nd. Gears with Teeth as for the 16 cyl. Cadillac ................... Recd. 29.3.35. Detail drawings completed and issued ........ 18.4.35. | ||