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 from Ferodo Ltd. regarding advised angles for belts on various pulley diameters.
| Identifier | ExFiles\Box 135\4\ scan0070 | |
| Date | 3rd May 1940 guessed | |
| FERODO LTD TECHNICAL DEPT. Continuation Sheet No. 2 Messrs. Rolls-Royce Ltd. D E R B Y. With regard to the last paragraph of your letter, we take it that the pulleys in question are correct for belt angle. We find it advisable with a 42° belt to use an angle of, say, 36° or 38° on a 6" pulley, and 34° on pulleys 3 or 4" diameter. Yours faithfully, FERODO LIMITED. [Signature: WC Shelton] Manager. Technical Department. | ||