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).
Modifications and axle ratio performance for the Sports Phantom, chassis 10-EX.
| Identifier | ExFiles\Box 15\5\ Scan028 | |
| Date | 29th November 1926 | |
| X7310 To DA{Bernard Day - Chassis Design}/EV.{Ivan Evernden - coachwork} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}5/LG29.11.26. RE. SPORTS PHANTOM. X.7884 We should like to know whether Barkers have been instructed to proceed with the modification to 10-EX, because if not, we consider that the work should immediately be put in hand. If the car is to be completed in the spring, we shall want it very early in the new-year as there will be a very considerable amount of experimental work to be done on it. We note that the 18/52 axle ratio will cause some difficulty on EAC-1 and EAC-V11. Our experience is that a 17/52 axle will be the very highest ratio we shall require if the car is to be used on the road as a high performance and not a super-speed car. Anything higher than this will increase our detonating difficulties at low speeds and spoil the top gear performance. A 17/52 axle gives 100 m.p.h. at under 3100 RPM. We hope to raise out M.E.P. at the higher engine speeds. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||