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).
Gearbox noise issues with the 25HP Synchro Mesh Helical 3rd Gearbox.
| Identifier | ExFiles\Box 178\3\ img006 | |
| Date | 9th January 1932 | |
| FROM R.{Sir Henry Royce} HS.{Lord Ernest Hives - Chair} - ER. ) (At Le CanadelHenry Royce's French residence.) Sent from WW. 9.1.32. 25HP. SYNCHRO MESH HELICAL 3rd. GEARBOX. Gearbox noises with helical gears always in mesh will never be quite all we would like, but should be far better than the straight teeth. It has occurred to me that we may find some definite difference between the 25HP. and P. 2. of the same type, because the 1st. motion shaft on P. 2. has a bearing each side of the helical spur driving gear. I am very pleased to hear that the new and simpler reverse is satisfactory now that we have suitable oil holes. This seems definitely to avoid the working out trouble, which is a bad fault. I am not sure if a test has been made of the direct drive with extra clearance in the nose bearing, or more central bearing, to avoid this working out. R.{Sir Henry Royce} (Stamp: RECEIVED 11 JAN 1932) | ||