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).
Results of road tests concerning front-end vibration and suspension settings.
Identifier | ExFiles\Box 11\3\ 03-page078 | |
Date | 5th May 1930 | |
To: Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} From G.W.H. Hôtel de France, Châteauroux, Indre. 5/5/30. We have been delayed in trying the tests that you suggested re lead weights on the front of the car. We have however tried this out during the week-end. We find that with the lead weights the radiator jellies, not considerably, but a definite movement which is periodical and is in sympathy with the joggles on the steering wheel. The joggles of the steering wheel are increased but are of less duration. The period of the joggles were considerably increased after taking the lead weights off. We have also brought on more joggles and more movement of the radiator by increasing the poundage of the front shock-dampers, which was done to stop the bouncing of the front of the car. These results are very definite, although I believe they are contrary to what we have experienced at Derby. We are at the moment running with the front damper load set to 105 lbs. H.P. and 75 lbs. L.P. In our Specification, I notice that the loads for the front shock dampers are given as being 90 lbs. L.P. and 90 lbs. H.P., but we found these loads to be 75 lbs. L.P. and 75 lbs. H.P. We have a correct balance here for measuring up to 200 lbs. so these figures are correct. We shall increase the low pressure load up to 100 lbs. and see whether there is any marked difference to the steadiness of the radiator with a more even load on the dampers. We do not of course get so much bouncing of the front. | ||