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).
Axle ratios for the 'Corniche' model based on tests for directional stability.
| Identifier | ExFiles\Box 98\5\ scan0050 | |
| Date | 7th August 1939 | |
| 450c. RHC.{R. H. Coverley - Production Engineer} from Rm.{William Robotham - Chief Engineer} c. By.{R.W. Bailey - Chief Engineer} c. RHC{R. H. Coverley - Production Engineer}/McC. Rm{William Robotham - Chief Engineer}2/R.7.8.39. AXLE RATIOS FOR THE 'CORNICHE'. Tests in France have indicated that in order to get directional stability we may go to a larger size of tyre on the 'Corniche'. If we do use a larger size of tyre, we shall want a 10 x 41 axle ratio. We cannot come to a definite decision yet as the tests have not been completed. We think it necessary, however, that six sets of 10 x 41 gears should be put in hand forthwith to suit the semi-floating axle. For the time being we do not want to alter the specification of the cars being built, and these should be fitted with 11 x 41 gears as instructed. Rm.{William Robotham - Chief Engineer} | ||