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).
Test report on a Phantom 1 gearbox with a continuous helical 3rd speed.
| Identifier | ExFiles\Box 66\4\ scan0260 | |
| Date | 5th December 1929 | |
| X8310 To R.{Sir Henry Royce} From Hs.{Lord Ernest Hives - Chair} c. to Gg. Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} Da.{Bernard Day - Chassis Design} c. to Hy.{Tom Haldenby - Plant Engineer} Hs.{Lord Ernest Hives - Chair}3/MJ.5.12.29. PHANTOM 1 GEARBOX WITH CONTINUOUS HELICAL 3RD. SPEED. X8310 X8770 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} | ||