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).
Comparative test report on different types of clutch lining materials and their performance.
| Identifier | ExFiles\Box 85\2\ scan0084 | |
| Date | 3rd May 1934 | |
| -5- HS{Lord Ernest Hives - Chair}/FJH.{Fred J. Hardy - Chief Dev. Engineer}20/KW, 3.5.34. Type of lining Wear due to 260 2000-3000 r.p.m. slips. Additional slips 500-3000 to produce total wear of 0.100" Remarks. New Type of Clutch to N.Sch.3948. RAD.11 chemically treated by Ferodos. 0 500 slips produced no measurable wear. Clutch behaved perfectly throughout test except that there was slight slipping at the 354th 500-3000 slip due to overheating of linings. V.M.20 moulded Untreated 0 500 slips produced wear of 0.044" Clutch slipped slightly during 2000-3000 slips and badly during the first 190 of the 500-3000 slips. The co-efficient of friction appeared to be poor under all conditions. Universal American lining for clutches | ||