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).
Clutch tests, including specifications, endurance testing, and observations on engagement.
| Identifier | ExFiles\Box 103\1\ scan0173 | |
| Date | 13th March 1935 | |
| +5300 Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux}15/KW.13.3.35. 19-G-IV Clutch Tests. Standard engine mounting, no rubber. Standard present type. No. of clutch springs 8. Free length 3.156" After test 3.125" Rating 142 lbs. per inch. Working load 150.8 lbs. Total load 1206.4 lbs. Working length 2.0937". Clutch fabrics mounted on pressure plate and flywheel plate. Area of clutch linings - outer dia. 10.5" inner dia. 8.375" Centre steel driving plate slotted 8 segments, thickness .100" Endurance test similar to test carried out on Buick. Clutch engaged in direct drive only. Engine speed 1500 to 2000. We dismantled this clutch before starting engagement tests. We found the centre plate in a bad condition. The surface which came into contact with the fabrics had been roughed up, the metal fused and pushed forward similar to other previous clutch plates. We have therefore had a new centre plate fitted before proceeding with the tests. The engagement of the clutch after refitting was moderately good. We find that it is of paramount importance to set the fingers correctly; otherwise there are jaggers. This is because our pressure plate has too many serrations, and if it is not released squarely, it tends to bind. | ||