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).
Performance and unreliability of A.T. speedometers.
| Identifier | ExFiles\Box 165\2\ img093 | |
| Date | 10th June 1937 | |
| By.{R.W. Bailey - Chief Engineer} from Rm.{William Robotham - Chief Engineer} WGL 6051 Rm{William Robotham - Chief Engineer}4/R.10.6.37. A.T. SPEEDOMETERS. With reference to By.5/G.9.6.37., in Item 6 we gave the same specification as the A.C. Speedometer could fulfil. It should be remembered that we only take 4 seconds to accelerate from 10 to 20 m.p.h., and if the speedometer lag should increase this to 5 seconds it would be equivalent to detracting from our apparent performance of 20%. Personally, I think the A.T. people deserve very little sympathy. We pay them a high price, their trip mechanism is notoriously unreliable, and now they want concessions on the rest of the instruments which manufacturers of cheaper instruments do not have to demand. Rm.{William Robotham - Chief Engineer} | ||