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 detailing the performance of rubber shackles fitted to a Hupmobile car.
| Identifier | ExFiles\Box 4\6\ 06-page16 | |
| Date | 1st June 1925 | |
| Oyl-E-8123 June 1, 1925. Mr. Claude Johnson, Rolls-Royce, Limited, London, England. Copy for attention of Mr. Royce Mr. Platford Mr. Hives Dear Sir: Re Rubber Shackles We send herewith for the attention of Mr. Royce, Mr. Hives and Mr. Platford, pictures of my Hupmobile car fitted with Mack (International Motor Company) Rubber Shackles. Also for Mr. Royce an advertisement of the Yellow Cab Company dealing with their use of Rubber Shackles on all Yellow Cabs. After 2500 miles use of these shackles, which were fitted by the New York branch of the International Motor Company early last April, I believe them to be a very great advance over the ordinary shackle. The noise of the car when traveling fast over rough roads, which formerly was objectionable, due to the metallic contact between the ends of the eye and the shackle, is now entirely absent. Also the rubber has a very marked effect in softening the high-speed vibration noises from the engine. The rubber appears to have a shock absorber effect also in traveling over rough surfaces in actually cushioning the blow and checking violent rebound. On the other hand, as at present fitted on my car, at slow speeds and over slight waves in the road the car develops a bouncing movement and does not ride as well as with the plain shackles. This disadvantage is similar in effect to that of a plain rear | ||