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 testing of a 20 HP rear axle gear set with thicker pinion teeth.
| Identifier | WestWitteringFiles\K\December1923\ Scan29 | |
| Date | 12th December 1923 | |
| R.R. 403A (40 H) (SL 42 12-7-23). J.H., D.{John DeLooze - Company Secretary} ORIGINAL EXPERIMENTAL REPORT. Expl. No. 4256 REF: HES/LSM.12.12.23. TO 'R' from Hs.{Lord Ernest Hives - Chair} c. to CJ. c. to RE. c. to R.{Sir Henry Royce} c. to Da.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} 20 HP. REAR AXLE. We have tested a set of gears made in C.H.N.S. in which the tooth of the pinion has been left thicker at the expense of the crown wheel teeth. The pinion teeth are .025" thicker than standard. We have run this axle for 50 hours on maximum torque 1st speed. At this period the thrust race for the pinion failed. The gear teeth on the pinion had not broken but they were cracked. Hm.{Capt. W. Hallam - Head Repairs} | ||