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).
Test report on a 20 HP rear axle pinion failure after 34 hours of running at maximum torque.
| Identifier | WestWitteringFiles\K\November1923\ Scan52 | |
| Date | 15th November 1923 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. c. to Rg.{Mr Rowledge} c. to Da.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} c. to E.{Mr Elliott - Chief Engineer} ORIGINAL Hs{Lord Ernest Hives - Chair}3/LG15.11.23. 20 HP. REAR AXLE. X4256 The 20 HP. rear axle fitted with 11/50 gears with the pinion made from air hardened steel, ran for 34 hours on 1st. speed. maximum torque. W After that amount of running several teeth broke on the pinion. We are now about to test an 11/50 axle with the standard C.H.N.S. gears similar to those we are at present sending out on cars. Hs.{Lord Ernest Hives - Chair} | ||