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).
Dynamometer test graph showing BHP at road wheels for a 1939 Humber Super Snipe.
| Identifier | ExFiles\Box 126\2\ scan0106 | |
| Date | 15th March 1939 | |
| HUMBER SUPER SNIPE (1939) DYNO BHP AT ROAD WHEELS DIRECT GEAR B.H.P. M.P.H. ENGINE R.P.M. TABLE DATA: ENGINE RPM | B.H.P. CORR'D TO 15°C | B.H.P. CORR'D TO 50°C | HP REQ'D TO DRIVE DINO 2000 | 54.3 | 51.0 | 0.4 2500 | 63.5 | 59.7 | 0.6 3000 | 70.3 | 66.0 | 1.0 3500 | 70.3 | 66.0 | 1.7 4000 | 59.3 | 55.8 | 2.4 4250 | 50.5 | 47.5 | 3.2 25 MPH | 1270 | 38.1 | 35.8 | 0.2 30 MPH | 1525 | 44.0 | 41.4 | 0.2 SPECIFICATIONS: AXLE RATIO: 4.09:1 TYRES: D'L'P 16 x 6.00 ROLLING CIRCUM: 86" PRESSURE: 35 lb/in² WT AS TESTED TOTAL: 3750 lbs REAR: 1933 lbs BARO: 770 mm GRAPH LEGEND: 15°C AIR 50°C AIR, CORRECTED FOR DYNO LOSS 50°C AIR | ||