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 test graph and data sheet from Brooklands comparing different car configurations and their lap speeds.
| Identifier | ExFiles\Box 29\3\ Scan141 | |
| Date | 1st November 1925 | |
| BROOKLANDS NOV. 1925 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 - 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: ROAD WHEEL H.P. ENGINE R.P.M. C.O OPEN C.O CLOSED C.O OPEN 4-1 -> C.O CLOSED STANDARD CAR COMP. RAT 4-1 HIGH COMPRESSION 5.2 - 1 2750 R.P.M. 89 M.P.H. 17-32 AXLE | ||