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).
Graph of Road Wheel B.H.P vs Engine R.P.M. and a table of lap speeds at Brooklands.
| Identifier | ExFiles\Box 181\M7\ img050 | |
| Date | 1st November 1925 | |
| BROOKLANDS NOV 1925 TABLE: CONDITION OF CAR | LAP SPEED | HALF MILE 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 4:1 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 (30, 40, 50, 60, 70, 80, 90) X-AXIS: ENGINE R.P.M (500, 1000, 1500, 2000, 2500, 3000) CURVE LABELS: STANDARD CAR COMP RATIO 4:1 HIGH COMPRESSION 5.2 - 1 C.O. OPEN C.O. CLOSED OTHER ANNOTATIONS: 2750 R.P.M. 89 M.P.H 17x52 AXLE | ||