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).
Causes of brake dipping on a Packard car and potential solutions using rubber bushes.
| Identifier | ExFiles\Box 127\1\ scan0283 | |
| Date | 1st February 1937 | |
| -2- Rm{William Robotham - Chief Engineer}/AFM{Anthony F. Martindale}1/R.1.2.37. The dipping of the front of the Packard when braking is due to three things:- (a) Powerful front brakes (impossible on P.III) (b) High C. of G.{Mr Griffiths - Chief Accountant / Mr Gnapp} (c) Light poundage shock dampers. The Bendix brakes fitted to the Packard occasionally cause a sideways dive. This we have come to associate with negative castor and dipping of the front, owing to our familiarity with P.III, but it must not be inferred that the same thing occurs on all cars. It will be noticed in the sketch that the front of the Packard is supported entirely on rubber. We have examined these bushes, and after 15,000 miles they are in excellent condition. We are fitting up one of our cars like this to see if it gets rid of front end noise. We are also continuing mileage on the Packard to try and establish a life for these bushes, which, if successful, would be a marked economy. Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} | ||