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).
Graph showing top gear acceleration performance for a 20/25 HP vehicle.
| Identifier | ExFiles\Box 5a\2\ 02-page188 | |
| Date | 25th May 1934 | |
| 20/25 HP 5.25 COMPN 9/41 HYPOID 25.5.34 SECONDS 10 20 30 40 50 60 MILES PER HOUR 10 20 30 40 50 60 70 80 TOP GEAR ACCELERATION. | ||