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).
Gearbox failures, modifications, and updated testing procedures.
| Identifier | ExFiles\Box 94\2\ scan0151 | |
| Date | 8th January 1937 | |
| -2- Rm{William Robotham - Chief Engineer}4/R.8.1.37. Modifications are in hand for all the failures, and these will be tested shortly. We look on the Cadillac gears as a quick means of getting information, the loads being about 70% higher than with the R.R. gears. We shall also shortly be testing a box fitted with R.R. gears having soft internal splines. Until very recently our testing of a new type of gearbox consisted of two hours on each gear. We now know this to be very inadequate . Vulture gears which passed this test failed on the road. We have had on 36-EX a case of the nut at the rear of 2nd motion shaft becoming loose after road running only. In future we shall look on 20 hours as a safe test. Most of the P.III gearbox can do this. Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} | ||