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).
Instruction sheet with test results comparing Raybestos and Ferodo clutch fabrics.
| Identifier | ExFiles\Box 26\4\ Scan176 | |
| Date | 16th February 1923 | |
| R.R. 26 10M Bks. (SE 591 13-3-18). M.P. 189358 X 3439 (crossed out) X719 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: Mr Hives 20 HP Clutch fabric. Raybestos v Ferodo. A series of tests have been carried out on the test bed engine to compare the above. Springs were removed in each case with the following result. No of springs | Ferodo | Raybestos 8 strong | No slip | No slip 6 " | No slip | slips 4 " | No slip | no slip 8 weak | No slip | slips 6 " | No slip | slips 4 " | slips | slips The Ferodo stands punishment from continuous slipping. Signed This Sheet must be filed on completion of the work. | ||