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).
Two graphs illustrating acceleration performance data for a 20 HP engine with different compression ratios and cut-out configurations.
| Identifier | ExFiles\Box 178\1\ img212 | |
| Date | 19th November 1926 guessed | |
| Top Graph: ACCELERATION ACCELERATION FT/SEC/SEC. ROAD SPEED M.P.H. Legend: HIGH COMP. 20 H.P. HIGH COMP. 20 H.P. CUT OUT OPEN STANDARD 20 H.P. Bottom Graph: ACCELERATION HIGH V LOW COMPRESSION RATIO 20 H.P. VELOCITY M.P.H. TIME SECONDS Legend: HIGH COMP. 20 H.P. 5-4 HIGH COMP: 20 H.P. CUT OUT OPEN STANDARD 20 H.P. 4-6 | ||