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).
Modifications and various engine mounting tests to reduce oscillation and 'jellying' on existing cars.
| Identifier | WestWitteringFiles\U\January1930-April1930\ Scan133 | |
| Date | 28th April 1930 | |
| -2- Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}2/MJ.28.4.30.Contd. As this modification in no way alters the external appearance of the car it is what we propose to recommend for use on existing cars. Admittedly, as it has no effect on the frame movement, it does not eliminate the wing and lamp oscillation but this is rarely so pronounced as that of the mascot, and consequently we think that this modification should deal with any complaint likely to arise on cars as at present being produced. Incidentally, complaints from customers of this feature appear to be very rare, 1-WJ, the Trials car, being the only case which we have so far tried where we think the customer might justifiably demand improvement. B. ENGINE MOUNTING. We have tried every variety of engine mounting including - (1) Four solid feet with the minimum thickness of rubber that can be tolerated for engine roughness. (2) Six point mounting, the additional points being at the rear of the gearbox. (3) Three point mounting, single point in front. (4) Three point mounting, single point at rear. All these tests have been extended from diabolo rubbers to solid engine feet. The results shew that no engine mounting that we can use on the existing Phantom 11 car eliminates 'jellying'. Briefly, the characteristics are :- (a) Rigid Engine Mounting four points. Small amplitude high frequency oscillations. Crisp and undamped, annoying because they are so periodic and can be set up by the bumps likely to occur on a fair main road. Steering good for selectivity and road shocks. | ||