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).
Fault with a synchro mesh gearbox after a 400-mile road test.
| Identifier | ExFiles\Box 15\5\ Scan254 | |
| Date | 14th March 1932 | |
| J 7310 To R.{Sir Henry Royce} From Hs.{Lord Ernest Hives - Chair} c. to Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} Da.{Bernard Day - Chassis Design} c. to By.{R.W. Bailey - Chief Engineer} Hs.{Lord Ernest Hives - Chair}1/WJ.14.3.32. P.2. SYNCHRO MESH GEARBOX. This gearbox has now run about 400 miles on the road. The gears, as we have previously mentioned, are very good for silence. The only fault we have with this box is that the synchro mesh portion does not work as smoothly as on the 25 HP. From the investigations we have carried out it would appear that the cones are not sufficiently powerful to synchronise the gear and one feels considerable resistance from the cam. It will be remembered that on the 25 HP. we increased the angle of the cones from 6º to 10º because we suspected them binding. In the case of the Phantom 11, where it would appear we require more power, we are trying again the 6º angle cone. Hs.{Lord Ernest Hives - Chair} | ||