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).
Secret memo regarding experiments and test results for a 4-speed gearbox.
| Identifier | ExFiles\Box 6\4\ 04-page087 | |
| Date | 3rd March 1925 | |
| X.5310 To HS.{Lord Ernest Hives - Chair} from AJS. c. to R.{Sir Henry Royce} CJ. BY.{R.W. Bailey - Chief Engineer} S E C R E T. AJS2/M3.3.25. I N D I A.{Mr Adams} 4-SPEED BOX. X.5310 We received your wire today as follows :- "FIRST TEST WITH TORSIONALLY FREE FIRST AND SECOND GEARS SUCCESSFUL WE ARE EXPECTING YOU INSTRUCT EXPERIMENTS CONTAINED IN RL/M13.2.25" HIVES. Presuming the reverse to be cured, and referring to 1st. and 2nd. speed only, the experiments asked for by R.{Sir Henry Royce} in the memo. referred to are :- (1) Keys narrowed at centre. (2) Increased dia. of pinion - 1st. speed. (3) Splines of 30° angle. (4) Use 14½° teeth. (1) Has been instructed and after about 8 or 9 successful tests at varying loads is now reported to have failed. (2) This was stopped in view of the success with (1), but has since been instructed in combination with the torsionally free pinion. (3) These have been instructed some weeks on LeC.2005. (4) This, like (2) was stopped in view of the success of (1), but we would hereby ask BY.{R.W. Bailey - Chief Engineer} to instruct these tests incorporated with torsionally free pinion with increased number of teeth shown on LeC.2007. AJS. | ||