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).
Drawing of a Spectre Flywheel with increased inertia.
| Identifier | ExFiles\Box 94\1\ scan0211 | |
| Date | 10th October 1936 | |
| EXACTLY AS ON G.83753. 13.200 DIA +.25 15.400 DIA +1 15.625 DIA +.10 17.800 DIA +.10 2.000 +.25 .550 -.10 .150 +.5 .300 R .050 R INCREASED INERTIA OF 2500 LBS. IN² FOR SPECTRECodename for Phantom III FLYWHEEL TO N.SCH 4571. ROLLS-ROYCE, LTD. PRINT ROOM OCT 10 1936 DERBY. Hs.{Lord Ernest Hives - Chair}2185. | ||