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).
Acceleration performance graph for a Lanchester 18 HP car, plotting road speed against time.
| Identifier | ExFiles\Box 22\3\ Scan091 | |
| Date | 25th February 1931 | |
| LANCHESTER 18 HP CAR ACCELERATION CAR WEIGHT 32 CWT. (& TWO PASSENGERS) CORRECTED SPEEDOMETER ERROR ROAD SPEED (M.P.H) TIME (SECS) 3RD GEAR TOP GEAR | ||