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).
Blueprint graph showing top gear acceleration, plotting speed in miles per hour against time in seconds.
| Identifier | ExFiles\Box 5a\2\ 02-page187 | |
| Date | 25th February 1930 | |
| TOP GEAR ACCELERATION. MILES PER HOUR. SECONDS. 20/25 H.P. 5.25 COMPN. 9/41 HYPOID 25.2.30 | ||