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).
Conclusions drawn from the first tests on an accelerometer, evaluating its effectiveness on level ground versus on hills.
| Identifier | ExFiles\Box 113\2\ scan0008 | |
| Date | 20th December 1922 | |
| X1725 Hs.{Lord Ernest Hives - Chair} from - Rm.{William Robotham - Chief Engineer} 20.12.22. CONCLUSIONS DRAWN FROM FIRST TESTS ON ACCELEROMETER. This is a non-recording instrument Readings on the level. The results obtained all tend to show that the accelerometer is not much use on the level. The tractive resistance readings vary considerably and are very small, and so difficult to read, added to which, they could be taken much more accurately with a stop watch. The accelerations on the level are shown fairly well, but again, are better obtained by velocity time diagram. Readings on hills. These are much more satisfactory, as if taken on a hill, which will hold the car at a steady speed on a gear, they give the steady tractive effort which the car is able to put forward at that speed. If a number of such readings were taken at various speeds, a power curve actually delivered to the road wheels at various speeds on any gear, could be plotted. To take these results with a stop watch, the gradient of the hill would have to be accurately known, even then it would be difficult. The tractive resistance of car at speed in question would also have to be known. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||