Brake drum vibration and groan tests, concluding the back plate is the weakest component.
| Identifier | ExFiles\Box 11\3\ 03-page458 | |
| Date | 28th July 1931 guessed | |
| (2) 6th. Present damping plates were carefully bedded on to the drums, and two extra retaining springs were fitted. The result was nil, vibrations could still be felt on the back plate of the drums. 7th. Steel ribbed brake drums were again fitted with the rubber intact. Result no groans. From these tests we proved that the weakest part of the brake mechanism was the back plate of the drums. The fitting of the rubber is hardly practicable, stiffer back plates would probably overcome the trouble, but this is rather difficult with the present design owing to the closeness of the wire spokes of the road wheels and the brake drums. We have not proceeded any further with the tests, due to the French job coming along. G.W.Hancock. G.W.H. | ||
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).