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).
Specifications for the Spectre Unit for No. 3 Chassis, detailing flywheel, ignition, and valve requirements.
| Identifier | ExFiles\Box 91\4\ scan0246 | |
| Date | 10th September 1935 | |
| To RHC.{R. H. Coverley - Production Engineer} X300a Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}14/KW.10.9.35. SpectreCodename for Phantom III Unit for No. 3 Chassis. Will you please ensure that the unit which will ultimately be prepared for No.3 chassis to go to France, will have the following flywheel marks :- Flywheel to have correct valve timing marks to E.87329. Ignition setting marks to the following - B.A.I. B. side hand control advance ignition setting,15° before A.1. TDC. A.A.I. A.{Mr Adams} side hand control advance ignition setting,13° before A.1. TDC. Exhaust Valves. E.86782 with solid stems: Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||