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).
Maximum speeds of Phantom II cars and the factors affecting performance, such as body type and windage.
| Identifier | ExFiles\Box 92\2\ scan0104 | |
| Date | 9th March 1931 | |
| To EP.{G. Eric Platford - Chief Quality Engineer} From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} 87771. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}1/MJ.9.3.31. With reference to LE16/C/4.3.31. We presume the lower speeds that JLE.{J. Lee Evans - Chassis Test Manager} gives were stop-watch figures. We think that any Phantom 11 cars should do over 80 m.p.h. with the cut-out open. It is a peculiar fact that large cars of the 19-EX. type sometimes have higher maximum speeds than better looking cars of the 18-EX. type, this merely confirms that the windage factor of any body is a very complicated matter. We should say that 83 m.p.h. over the measured mile with the Continental type body is quite good. A favourable wind could easily make two or three miles per hour difference, which might account for the variation mentioned. LE16/C/4.3.31. Returned herewith. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||