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).
Test graph plotting sliding effort against torque for a 20/25 HP propeller shaft spline.
| Identifier | ExFiles\Box 105\2\ scan0133 | |
| Date | 8th September 1932 | |
| PERE PROP SHAFT SPLINE TEST 20/25 HP SHAFT USED. SLIDING EFFORT LBS. 140 120 100 80 60 40 20 0 TORQUE LB. FT. 10 20 30 40 50 60 HS.{Lord Ernest Hives - Chair} 703 8-9-32 | ||