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).
Testing the reverse gear and the number of keys required for the J. 3 & 4 gearbox.
| Identifier | ExFiles\Box 104\4\ scan0050 | |
| Date | 1st October 1931 | |
| COPY X5310. HS.{Lord Ernest Hives - Chair} From DA.{Bernard Day - Chassis Design} DA{Bernard Day - Chassis Design}3/M6. 10. 31. X5310. Copy to BY.{R.W. Bailey - Chief Engineer} J.{Mr Johnson W.M.} 3. & 4 GEARBOX. With reference to HS{Lord Ernest Hives - Chair}/GRY{Shadwell Grylls}1/MJ31031, would it not be desireable to run the reverse under full engine torque for some period. Probably you would not expect it to stand up for half an hour, but one thinks it should stand up for such a period as 10 mins. for instance. The D.{John DeLooze - Company Secretary} O.{Mr Oldham} suggested that 4 keys should be used to retain the reverse wheel on the shaft, but we think that 2 should be enough. Would Expl. Dept. please verify this. We suggest that the keys should be capable of taking the full torque without aid from the taper. This could perhaps be proved by tightening the nut with something less then the maximum force. DA.{Bernard Day - Chassis Design} | ||