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).
Performance curve comparison between a standard gearbox and a proposed overdrive for the Bentley III.
| Identifier | ExFiles\Box 86\4\ scan0169 | |
| Date | 17th April 1937 | |
| N SCH 5120 ROLLS-ROYCE, LTD. PRINT ROOM APR 20 1937 PERFORMANCE CURVES COMPARISON BETWEEN STANDARD GEARBOX AND PROPOSED OVERDRIVE BENTLEY III B.H.P AT ROAD WHEELS 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 R.P.M 500, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500 M.P.H. 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110 2000 R.P.M. 2500 DIRECT DRIVE 3500 2500 OVERDRIVE 3000 Proposed Overdrive Gearbox Standard Bentley Gearbox Resistance H.P. Rear Axle Ratio 4.1:1 6.50 x 17 Tyres 1ST 2ND 3RD DIRECT 1:2 OVERDRIVE 26 36 42 49 54 58 59 64 65 72 74.5 82.5 86.5 94.5 111 HP 17.4.37 | ||