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 chart from Brooklands comparing engine RPM to road wheel BHP and lap speeds for various car configurations.
| Identifier | ExFiles\Box 69\4\ scan0297 | |
| Date | 1st November 1925 | |
| BROOKLANDS Nov. 1925 TABLE: CONDITION OF CAR LAP SPEED HALF MILE SPORTS CAR HIGH COMPRN. 17 TOOTH AXLE. STANDARD CONDITION C.O. CLOSED 79.2 80.4 STANDARD CONDITION C.O. OPEN 80.5 82.6 STANDARD TOURING CAR 4.4:1 COMPRN 15 TOOTH AXLE. STANDARD CONDITION C.O. CLOSED 74.13 SPORTS CAR FRONT WINGS REMOVED TOP PANEL OF WIND SCREEN RAISED. C.O. OPEN 87.8 89.6 GRAPH: Y-AXIS: ROAD WHEEL B.H.P. X-AXIS: ENGINE R.P.M. CURVE LABELS (FROM TOP): 1. C.O. OPEN 2. C.O. CLOSED 3. C.O. CLOSED GRAPH ANNOTATIONS: STANDARD CAR COMP. RAT. 4-1 HIGH COMPRESSION 5.2 - 1 VERTICAL TEXT ON RIGHT: 2750 R.P.M. 89 M.P.H. 17 x 52 AXLE WATERMARK (FAINT): COPYRIGHT ROLLS-ROYCE LTD DERBY | ||