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).
Letter discussing the causes of low speed wobbles in cars and mentioning an attached memo on wind resistance.
| Identifier | ExFiles\Box 161\1\ scan0183 | |
| Date | 19th August 1938 | |
| 1380 also 1945 W/S. Sr. from Rm.{William Robotham - Chief Engineer} Rm{William Robotham - Chief Engineer}2/R.19.8.38. Dear Sr., With reference to Sr6/ET.17.8.38., it is a fact which we are not able to explain that some cars are worse for low speed wobbles than others. The three things which, as far as we know, affect low speed wobbles most are:- (1) Flexibility in the side steering tube. The less spring there is in the side steering tube the less wobble. (2) Backward pivot lean. The less backward pivot lean the better. (3) Low front tyre pressures or worn tyres are both bad for wobble. One other point, it is possible that the steering on this car is particularly free, in which case a small amount of friction in the cross steering tube may put matters right. I attach a copy of a memo I have written on wind resistance, from which you will see that the Ford is not very far behind the Paulin Bentley. We, therefore, shall not rest content until we get a better result. However, we shall know more when we have measured up everything on the Paulin Bentley. I am looking forward to seeing you the middle of next month, we may be able to arrange some form of shooting, but no one in this country deals with much except grouse until October. Yours sincerely, | ||