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 tests showing time taken in seconds for various speed ranges.
| Identifier | ExFiles\Box 29\3\ Scan078 | |
| Date | 3rd June 1920 | |
| 3.6.20. ACCELERATION TESTS. Hood and screen up - cut-out closed. 1/8" liners under cylinders. Speed. Time in secs. cut-out open. 10 to 20 M.P.H. 4 3 1/2 10 to 30 " 8 7 1/2 10 to 40 " 13 1/2 13 10 to 50 " 19 18 10 to 60 " 25 23 1/2 | ||