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).
Specification revision for Engine Unit No. 21 (L.H. Chassis 25-EX), detailing changes to clutch and friction lining components.
| Identifier | ExFiles\Box 169\1\ img152 | |
| Date | 6th March 1931 | |
| To Hs.{Lord Ernest Hives - Chair} from RHC{R. H. Coverley - Production Engineer}/WSC.{W. S. Cassel} RHC{R. H. Coverley - Production Engineer}/WSC{W. S. Cassel}3/IS.6.3.31 ENGINE UNIT NO.21. (L.H.CHASSIS 25-EX.) Specification of the above Unit issued in RHC{R. H. Coverley - Production Engineer}/WSC{W. S. Cassel}2/MS19.2.31. is revised as follows.- PASSED TO TEST 4.3.31. Previous Specification. Flywheel & Clutch to LOP. G.78478. Clutch Cover & Friction Plate - Removed. Servo Motor Mechn: to LOP. G.77669. G.78524 Friction Linings - Cotton "A" - Removed. Revised Specification. Flywheel & Clutch to LOP. G.78478. Solid Drive to Ex.5811 - fitted. Servo Motor Mechn: to LOP. G.77669. Special Friction Linings - Die Pressed Ferodo R.A.D.13/047 secured with staples. RHC{R. H. Coverley - Production Engineer}/WSC.{W. S. Cassel} | ||