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 graphs showing acceleration and velocity for a 20 HP engine with different configurations.
| Identifier | ExFiles\Box 21\2\ Scan033 | |
| Date | 3rd December 1926 guessed | |
| 20 H.P. PERFORMANCE. ACCELERATION ACCELERATION FT/SEC/SEC ROAD SPEED M.P.H. 1 HIGH COMP. 20 H.P. 2 HIGH COMP. 20 H.P. CUT OUT OPEN 3 STANDARD 20 H.P. 4 20 H.P. SINGLE LORRAINE CARBURETTER STANDARD TOURING WINDOVER 4 SEATER. HOOD & CURTAINS UP. AXLE RATIO 11 x 50 CAR WT. EMPTY 1.56 TONS. VELOCITY M.P.H. TIME SECONDS 1 HIGH COMP. 20 H.P. MOD. EX. MANIFOLD 2 DITTO - CUT OUT OPEN 3 STANDARD 20 H.P. 4 AS 2 SINGLE LORRAINE CARBS | ||