Test report on the Phantom 1 gearbox with a continuous helical 3rd speed.
| Identifier | ExFiles\Box 69\4\ scan0262 | |
| Date | 5th December 1929 | |
| x8770. To R. {Sir Henry Royce} From Hs. {Lord Ernest Hives - Chair} c. to SS. {S. Smith} c. to F.R. c. to R. {Sir Henry Royce} c. to EV. {Ivan Evernden - coachwork} No.S/AJ.5.12.29. x8310 x8770. PHANTOM 1 GEARBOX WITH CONTINUOUS HELICAL 3RD. SPEED. We have tested Phantom 1 with the gearbox which is fitted with the double helical 3rd speed with the internal gear for engaging similar to the present top gear. The 3rd speed as a gear is very quiet. In the back of the car it is difficult to distinguish any gear noise, but in the driver's seat there is a definite high pitched howl. The engagement of the 3rd gear still requires a certain amount of skill. We were proposing to cut back alternate teeth on the internal gear so that the engagement can be made more easily. There is a certain amount of noise from the 3 speed gears when the engine is idling. Hs. {Lord Ernest Hives - Chair} | ||
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).