Speedometer calibration data for a standard 20/25 chassis with 11/50 axle and 19' tyres.
| Identifier | ExFiles\Box 165\4\ img261 | |
| Date | 29th January 1935 guessed | |
| V6051. R.R. STANDARD 20/25 CHASSIS SPEEDOMETER CALIBRATION. REVS PER MILE 836 11/50 AXLE 19" TYRES. Correct revs. 140 279 419 558 700 838 978 1117. DIAL READING. FLEX REVS PER MIN. REQUIRED AT DIAL READING. PERCENTAGE ERROR. 10 143 2% slow 20 282 1% slow 30 419 Correct 40 552 1% fast 50 685 2% fast 60 812 3% fast 70 940 4% fast 80 1060 5% fast | ||
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).