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).
Measuring engine torque and fitting a spring-controlled friction damping system.
| Identifier | ExFiles\Box 183\M22\ img262 | |
| Date | 22th September 1923 | |
| R.R. 493A (40 H) (SL 42 12-7-23). J.H.D. 110 EXPERIMENTAL REPORT. Expl. No. REF: Hs{Lord Ernest Hives - Chair}5/LG22.9.23. that some was going through the frame. We therefore measured the torque through a spring balance (as in fig.) getting the engine floating in an up-right position. The total engine torque is about 1350 ins.lbs. against it was acting the moment of the weight of the engine owing to the displacement of its centre of gravity which we had previously measured. The engine we used in the car had no magneto or dynamo - but it was fitted with a carburetter, and after allowing for these we found the moment of the engine weight acting against the torque reaction to be about 200 lbs.ins. We therefore expected to get a torque of somewhere about 1150 ins.lbs. through our spring balance - what we actually got as a maximum, was 700 ins.lbs. showing that we were still getting a lot through the frame. We have fitted up a spring controlled frictionally damped arm to take the torque through to the frame but in order to give it a real chance we are going to make certain that we get practically all the torque through it and not through some undamped connection. This will enable us to estimate the true value of our friction damping. Hs{Lord Ernest Hives - Chair}/Rs.{Sir Henry Royce's Secretary} | ||