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).
Investigations into a 20 HP starter's multiple clutch performance using different spring and disc materials.
| Identifier | WestWitteringFiles\R\2October1927-November-1927\ 117 | |
| Date | 11th November 1927 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux} c. to BJ. Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} X5650 X5300 20 HP. STARTER. INVESTIGATIONS WITH MULTIPLE CLUTCH TO LeC. 2442. We have had this clutch built up and find it to be as smooth in operation as the present standard. It was fitted up with cushion spring D.51378, hold out spring D.51567 and a buffer spring D.51378 giving a load of 25 lbs. at 1.050 compression. We are however of the opinion that there is too much initial friction when using three cork discs. In the test we apply a load equal to starting up a cold engine and our aim is to get a slight slip before the buffer spring is fully wound up. We can get this by reducing the poundage of the cushion spring but this is not feasible owing to the pinion with this poundage having a faulty engagement. We are almost O.K. when using two instead of three cork discs with cushion spring. We propose trying three ferobestos discs in place of cork which will give a much less co-efficient of friction. We have tried buffer springs D.51604 giving a poundage of 20 lbs. at 1.050 compression and find that if we use the lower poundage we immediately get a bad thumping effect owing to the too rapid winding up of the spring. We have not observed anything beneficial in the increased clearance on the thread sideways. We have tried two operating sleeves, one which was called for in LeC. and one as present standard giving clearance top and bottom of threads | ||