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 table on the performance of different clutch lining materials under various heat and slip conditions.
| Identifier | ExFiles\Box 85\2\ scan0083 | |
| Date | 3rd May 1954 | |
| -4- RB{R. Bowen}/FJH.{Fred J. Hardy - Chief Dev. Engineer}20/KW. 3.5.54. | 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. | | :--- | :--- | :--- | :--- | | RAD.11 2 hrs. at 700°F.{Mr Friese} | 0.006 | - | Behaved perfectly throughout 2000-3000 slips and first 4 of 500-3000 slips. Slipped and smoked from 4th to 40th of 500-3000 slips. No improvement over 1 hr. at 700°F.{Mr Friese} Test discontinued. | | RAD.11 1¼ hrs at 800°F.{Mr Friese} | 0.008 | 250 | Behaved perfectly throughout 2000-3000 slips and first 28 of 500-3000 slips. Slipped and smoked at 29th, 30th 38th, 39th and 50th of 500-3000 slips. | | RAD.5 1¼ hrs. at 600°F.{Mr Friese} | 0.004 | - | Very bad slipping and smoking throughout 2000-3000 slips and first 50 of 500-3000 slips. Test discontinued. | | RAD.11 chemically treated by Ferodo. | 0.005 | 355 | Behaved perfectly throughout 2000-3000 slips. Bad slipping but no smoke for first 20 500-3000 slips and at approx. every 7th slip up to 90. From 90 onwards clutch behaved perfectly. | | ||