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).
Test report comparing the performance and wear of different types of clutch linings.
| Identifier | ExFiles\Box 103\1\ scan0097 | |
| Date | 5th May 1934 | |
| -5- Hs{Lord Ernest Hives - Chair}/FJH.{Fred J. Hardy - Chief Dev. Engineer}20/KW. 5.5.34. | Type of lining | Wear due to 500 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. 3848. | | | 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. | | | | | ||