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).
Summary of test results focusing on frame and engine mounting to eliminate front-end oscillation on the SS model.
| Identifier | WestWitteringFiles\T\2January1929-June1929\ Scan024 | |
| Date | 12th January 1929 guessed | |
| contd :- -4- Summarising the results of our tests so far :- It would appear that we shall in every way benefit from the SS.{S. Smith} type of frame and engine mounting when we eliminate the remaining 10% front end movement. If it were possible to add to the torsional rigidity of the front end of the frame apart from the engine, this might produce the required result. At the moment the oscillation appears to be almost exclusively confined to the very front of the chassis. We are trying varying the subframe mounting because all the SS.{S. Smith} chassis before the bodies were mounted had perfect steerings and steady radiators at all speeds even with the four flexible engine feet. It was only after the bodies were mounted that the front end trouble started. We are also trying the balance weights on the SS.{S. Smith} shaft because if this makes the engine smoother it will enable us to increase the rigidity of the feet. We are hopeful from these tests that eventually we shall be able to use lower front tyre pressures on the finished SS.{S. Smith}. we have been wanting to do this for a long time on the Phantom to improve riding qualities. Hs{Lord Ernest Hives - Chair}/Ru. | ||