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).
Criticisms of the Goshawk 11 engine, specifically addressing a seizing clutch trunnion sleeve during testing.
| Identifier | WestWitteringFiles\G\August1921\ Scan33 | |
| Date | 1st August 1921 | |
| [Crossed out illegible text] ORIGINAL Hal/LCS. 8. 21. "GOSHAWK 11" CRITICISMS CONTD: X4219 Clutch Trunnion. On the engine on test we have had the sleeve seize up which operates the clutch levers. This sleeve is soft steel; revolving in it is the hollow shaft which is revitted to the cast iron plate carrying the levers. We assume that the whole time the engine is running the sleeve is stationary. It may be thought that it would make no difference if this sleeve went round with the shaft when the clutch was not in operation. The weight of the clutch pedal however, will always be on this sleeve and if it was revolving with the shaft, the ends of the clutch levers will be worn. As soon as the clutch is depressed or any weight put on the clutch, the sleeve must stand still in order for the thrust bearing to work. The drawing clearance of the sleeve on the shaft is from .001" to .003". There is no means provided for lubrication. After we had had this seize up on the engine we increased the clearance to .004". We tried it again and it appears to have seized up again. It is certainly going round solid with the shaft. As the clutch also slips we have locked open the clucth in order to continue our tests. We consider that there must either be some means of providing lubrication for this sleeve or a self-lubricating material should be used. We think it would be a pity if it was necessary to remove the inspection cover very frequently for oiling. contd:- | ||