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 modifications and drawing issue dates for the Spectre 12-Cylinder Engine.
| Identifier | ExFiles\Box 30\3\ Scan060 | |
| Date | 19th January 1935 | |
| - 9 - BY.1/G.19.1.35. SPECTRECodename for Phantom III 12-CYL. ENGINE. N.Sch.4231 Unit Construction Shock Damper adapted to simple lever system. I.F.W.S .......... Recd. 19.10.34. Detail drawings completed and issued ........ 19.11.34. N.Sch.4233 Modfn. to fitting bolts in Gearbox casing .... Recd. 24.10.34. Detail drawings completed and issued ........ 5.11.34. N.Sch.4234 Mod. to Selector Lock Housing & Casing ...... Recd. 24.10.34. Detail drawings completed and issued ........ 8.11.34. LeC.4160 Raised Silencer Front End ................ Recd. 3.11.34. Detail drawings completed and issued ........ 9.11.34. LeC.4162 Modfn. to Larger Water Pump .............. Recd. 31.10.34. Detail drawings completed and issued ........ 13.11.34. LeC.4177 Distributor Head & Rotor ................ Recd. 5.11.34. Detail drawings completed and issued ........ 21.11.34. N.Sch.4242 Additional Pull-off Springs ............. Recd. 29.10.34. Detail drawings completed and issued ........ 21.11.34. N.Sch.4250 Rear Engine Mounting & Tie Link .......... Recd. 6.11.34. Detail drawings completed and issued ........ 27.11.34. N.Sch.4249 Clutch Casing & Clutch Operation ......... Recd. 6.11.34. Detail drawings completed and issued ........ 23.11.34. N Sch.4252 Modfn. to Actuating Sleeve - 3rd & 4th. .... Recd. 5.11.34. Detail drawings completed and issued ........ 7.12.34. RR.Sch.781 Switchbox - Revised Design. Detail drawings completed and issued ........ 13.12.34. RR.Sch.783 Raised Gearbox Crossmember & Additional Body Bracket. (Modfn. to LeC.4160 and EVS.130). Detail drawings completed and issued ........ 20.12.34. RR.Sch.788 Modified Rear Damper Suspension. Detail drawings completed and issued ........ 20.12.34. RR.Sch.789 Suction Filter for Damper Governor. Detail drawings completed and issued ........ 5.12.34. | ||