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).
Severe slipping test performed on a Phantom driven plate clutch.
| Identifier | ExFiles\Box 13\7\ 07-page074 | |
| Date | 25th September 1930 | |
| To Hs.{Lord Ernest Hives - Chair} From G.W.H. 87480 Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux}2/MJ.25.9.30. PHANTOM DRIVEN PLATE CLUTCH. We have carried out a severe slipping test with the driven plate clutch to obtain values of time taken to seize the pressure plate up with .008" clearance and .020" clearance on the splines. The test was taken as follows :- Dynamometer set for full load. Engine revs. 2000. Clutch engaged to give excessive slipping before taking up the drive. The pressure plate became hard to disengage after 70 engagements as against 20 in the previous test. The pressure plate as on the previous test, became hard to engage as the speed of the engine increased. The test was continued until 450 severe slipping engagements had been made, the clutch was then dismantled for examination. The condition of the fabric was 100%. .025" total wear had taken place. The splines of the pressure plate were filled up with a dry powder that had come out of the fabric but it did not interfere with the freedom of the plate. The back plate had distorted and dished approx. .015 .020". The whole of the pressure springs were found to have the first three coils collapsed due to the heat being | ||