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 detailing engine speed, revolution counter accuracy, and water temperature readings.
| Identifier | ExFiles\Box 168a\4\ img048 | |
| Date | 8th November 1937 | |
| -2- It will be noted that the A.C. revolution counter underestimates the engine speed by approximately 1.7% and that the A.C. speedometer is to all intents and purposes accurate. Water temperatures were also taken on the road. With the air at 12°C the mean of ten readings in 140 miles was - Rear of block 78.7°C. Top water pipe 77.6°C. The maximum running temperatures were 80°C and the minimum 76°C on both thermometers. After five minutes idling at a level crossing the water temperature rose to 95°C. RM{William Robotham - Chief Engineer}/LMW. | ||