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).
Tests for petrol systems, threaded shackles for rear road springs, and Ferodo brake linings on Chromidium drums.
| Identifier | ExFiles\Box 91\2\ scan0354 | |
| Date | 18th September 1937 | |
| 7. Further tests were carried out which showed that by reducing the amount of the petrol system exposed to under bonnet heat, which includes the pipes down by the pedals, the critical air temperatures could be raised to 37°C, that is, nearly 100° farenheit. Work on the improved scheme is in progress in order that it can be made suitable for production. 2. Led.3668. Threaded Shackles for rear road springs. Object - To overcome development of side play and consequent knocks which is a serious trouble with the standard shackles. It is aggravated by the sideways shake of the rear axle. The size of the spring eyes and consequently the proportions of the threaded pins and bushes were not the same at the front and rear ends of the springs, so it was necessary to adapt the scheme to the existing spring eyes. The rear shackles were quite satisfactory and overcame the troubles previously experienced. The shackles at the front ends gave trouble due to seizure and the bushes turning in the spring eyes. The next scheme is to have the front shackles identical to the rear shackles which were successful. 3. Ferodo L.L. brake linings on Chromidium Drums. Object - To overcome squeaks by means of lead bonded liners. Reduction of cost of brake drums by use of Chromidium instead of Hillenite. These brakes were thoroughly successful in every way, and withstood without any ill effects some very severe testing. After returning to England 750 miles were run with the tipping shoes set solid, during which time the brakes were still free from squeaks. | ||