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).
Clutch friction coefficients, proposing a test for losses, and comparing Phantom and 25HP models.
| Identifier | ExFiles\Box 13\7\ 07-page127 | |
| Date | 21th June 1932 | |
| HS.{Lord Ernest Hives - Chair} FROM DA.{Bernard Day - Chassis Design} X7300 DA{Bernard Day - Chassis Design}1/M21.6.32. X.5300. X.7300. CLUTCHES. We have discussed with R.{Sir Henry Royce} the question of the co-efficient of friction shewn by our clutches, and he suggests that we should carry out a test with a view to determining where the losses occur. It is suggested that the serrations, approximately 1.125 dia. between the driven member of the clutch and the 1st. motion shaft of the gearbox, may under certain circumstances lock up before the full spring pressure has come on both sides of the plate, causing loss of pressure on one side. R.{Sir Henry Royce} suggests that in order to test this we should gradually reduce the spring pressure on the Phantom until it is just made to slip. The Phantom differs from the 25HP. in having a flexible joint between the driven shaft of the clutch and the 1st motion shaft of the gearbox, so that the serrations cannot lock up very firmly in space. DA.{Bernard Day - Chassis Design} | ||