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 table comparing particulars for different clutch models.
| Identifier | ExFiles\Box 93\3\ scan0018 | |
| Date | 16th February 1933 | |
| SHEET 1 CLUTCH PARTICULARS COLUMN HEADERS: P I, 20/25, T III, PERE., BENSPORT TOTAL SPRING POUNDAGE: 2020, 1134, (1685) 1284, 1020, 1134 SEPARATION THEORETICAL: .086, .087, .105, .107, .091 LOST SEPARATION FROM CUSHIONING: .012, .025, .010, .010, .025 PRESSURE ON LININGS: 33.3, 35.8, (42) 34.0, 40.2, 35.8 WORKING COEFFICIENT OF FRICTION: .175, .179, .216 (.175), .154, .198 MAX. WEAR BEFORE ADJUSTMENT: .012, .027, .025, .025, .027 PEDAL PRESSURE THEORETICAL: 35, 34.5, (47) 38, 31, 34.5 PEDAL TRAVEL: 4.960, 3.200, 3.550, 3.500, 3.000 ENGINE TORQUE: 358, 161, 208, 107, 178 FABRIC DIA.: 13.85 - 10.7 R=6.14, 10.55 - 8.4 = 4.74, 10.675 - 8.125, 9.0 - 7.0, 10.55 - 8.4 ACTUAL SEPARATION ALLOWING FOR LOSSES: .046, .067, .058, .066 MEASURED PEDAL EFFORT TO PUT CLUTCH OUT: 50, 50, , 28 MEASURED PEDAL EFFORT TO HOLD " ": 35, 35 FINGER RATIO: , 3.94, 3.5 PEDAL TO THRUST BRG. RATIO: , 3.85 ARRANGEMENT OF PEDALS: F.84552, F.58013, F.58644 RR.SCH.281, R.R.SCH.165, L.E.C. 3280 L.E.C. 3401 ARRANGEMENT OF CLUTCH: G.78723, G.53692, N.SCH.3362, G.100800, G.53692 | ||