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).
Statistical summary of clutch and coupling fabric failures and complaints for various models.
| Identifier | ExFiles\Box 47\3\ Scan192 | |
| Date | 30th June 1931 | |
| -3- 20 HP. 25 HP. PH.I. PH.II. TOTAL. GRAND TOTAL. REMARKS. COUPLING FABRIC FAILURES. June Quarter. C.C. - - 5 12 17 } 32 W.P. - - 2 13 15 } Previous " C.C. - - 2 11 13 } 35 W.P. - - 4 18 22 } Six months. - - 13 54 67 67 An improved type of coupling with machine rivetted driving plates is now being used on all Ph.I and Ph.II chassis. We have had no failures with this type. See Depot Sheets Hd.{Mr Hayward/Mr Huddy}163/167/178/180/194 The new coupling is fitted whenever there are signs of the failure of the original couplings. TOTAL CLUTCH COMPLAINTS. June Quarter. C.C. 13 13 5 21 52 } 53 W.P. - - - 1 1 } Previous " C.C. 7 14 8 10 39 } 42 W.P. - 3 - - 3 } Six months. 20 30 13 32 95 95 CLUTCH JAGGERS. June Quarter. C.C. 7 4 2 6 19 } 20 W.P. - - - 1 1 } Previous " C.C. 6 9 3 5 23 } 25 W.P. - 2 - - 2 } Six months. 13 15 5 12 45 45 A definite cure can be effected by fitting new R.A.D.1 type clutch fabrics. This material is now available for all Ph.I, Ph.II, and 20 HP. cars and has been fitted to all new cars built since March 1931. See Depot Sheets Hd.{Mr Hayward/Mr Huddy}185 and Hd.{Mr Hayward/Mr Huddy}196. CLUTCH NON-STOP AND SLIPS. June Quarter. C.C. 6 9 3 15 33 } 33 W.P. - - - - - } Previous " C.C. 1 5 5 5 16 } 17 W.P. - - - 1 1 } Six months. 7 15 8 20 50 50 Slipping is often due to over doping but additional spring pressure is now adopted on 20 HP. and 20/25 HP. cars. See Depot Sheets Hd.{Mr Hayward/Mr Huddy}196 and Hd.{Mr Hayward/Mr Huddy}205. The latest material and additional spring pressure effect a definite cure. | ||