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).
Technical note specifying clutch wear allowances and spring deflection.
| Identifier | ExFiles\Box 107\2\ scan0032 | |
| Date | 12th October 1938 guessed | |
| Co WHT Clutch Wear The maximum allowance for wear is .035" on each face Total .070" Total deflection of spring is 1.000" under 1320 lbs load. with .070 worn off faces of clutch fabric the fall in pressure is only 7% and this is well covered in original loading figure B1 | ||