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).
Propeller shaft thrust tests and material considerations.
| Identifier | ExFiles\Box 148\4\ scan0008 | |
| Date | 26th September 1932 | |
| X484 DA.{Bernard Day - Chassis Design} from Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}11/KT. 26.9.32. PROPELLER SHAFT THRUST. With reference to R5/M14.9.32. We have been confirming our tests on a standard propeller shaft and find that a good average is 300 lbs. and thrust for 150 lbs/ft. engine torque. By our calculations this gives a µ of .166 which in view of the unit pressure of 950 lbs/sq.in. on the splines, and the fact that the material used is soft, does not seem improbable. We shall very shortly have on test the hardened splines and will issue a full report as soon as we have complete results. It is thought that there may be some difficulty in making the female splines a good bed and hardened at the same time; possibly we shall find the hardened inner member alone to be sufficient. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||