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).
The endurance and strength test of gears in a 20 HP gearbox.
| Identifier | ExFiles\Box 75\1\ scan0310 | |
| Date | 7th November 1928 | |
| RG.{Mr Rowledge} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} X4247 Hs{Lord Ernest Hives - Chair}/Rp3/LG7.11.28. STRENGTH OF GEARS. X5310 With reference to the endurance test to which we have subjected the gears in the 20 HP. gearbox. On the 3-speed box we ran a continuous full torque bottom gear test on these gears for as much as 30 hrs. without failure. The bottom gear reduction is 3.17 to 1. The approximate maximum torque of the 20 HP. engine is 140 lbs/ft. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||