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 and whirling speed, detailing test results and future plans.
| Identifier | ExFiles\Box 148\4\ scan0007 | |
| Date | 26th September 1932 | |
| X4.84. R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} c. SS.{S. Smith} Wor.{Arthur Wormald - General Works Manager} c. E.{Mr Elliott - Chief Engineer} Da.{Bernard Day - Chassis Design} c. Ey. Hdy.{William Hardy} Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} 9/KT. 26. 9. 32. PROPELLER SHAFT THRUST. WHIRLING SPEED. R.S/M.14.9.32. We do not think that the propeller shaft thrust due to the splines binding, lowers the critical speed of the shaft. If anything, we believe the contrary to be the case; that the whirling speed is higher when the shaft is under torque. We did some tests with a large mass in the middle of the shaft so as to be able to run above the critical speed. The back wheels were motored over on the dynamometer and the whirling speed when driving the engine was 43, and when in neutral was 35 m.p.h. Other tests have shewn that the 3.00" diameter full length shaft begins to be rough at 70 m.p.h. in neutral or under load. We expect to be testing hardened splines in a few days. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||