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).
Supercharger worm drives and engine smoothness, with comparisons to competitors' vehicles.
| Identifier | ExFiles\Box 173\4\ img098 | |
| Date | 6th December 1935 | |
| -4- HS{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}S/KW.6.12.35. (s) The only way Graham have succeeded in getting their supercharger worm drive to remain quiet is by using straight sided rack teeth made only by the Michigan Tool Co. These have a large area of contact and if accurately located to .00025" are quite satisfactory. G.M. research rather like the Auburn epicyclic drive, but Kishline says that dirty oil very soon causes trouble. Morning of 26.11.35. Got two letters from Ru. and will get all the dope on the Zephyr and as many of the costs as possible. By the time we have found out why the Zephyr 12 is as rough or rougher than the Ford V-8 we could have copied exactly the Cadillac V-8, one of which I am borrowing to go to Strombergs. Cadillacs use a 'Diamond' rubber mounting, and by adjusting the side feet alter the weight distribution of the engine fore and aft for maximum smoothness. HS{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||