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).
Vehicle acceleration times and braking distances.
| Identifier | ExFiles\Box 47\1\ Scan215 | |
| Date | 14th December 1925 | |
| EXPERIMENTAL REPORT -5- Expt. No. REF Hs{Lord Ernest Hives - Chair}/Rn{Mr Robinson}/LG14.12.25 Expressing the time to accelerate in m.p.h. and seconds, instead of as in Graph 1. - we have :- Increase in speed. | Time taken secs. | 117-MC. | Standard. ---------------------------------------- 10 - 20 | -- | 4.9 20 - 30 | 5.0 | 5.3 30 - 40 | 5.4 | 6.4 40 - 50 | 6.1 | 7.7 50 - 60 | 7.4 | 11.1 And comparing the distances to rest instead of the retardation produced by the brakes :- Road Speed M.p.h. | Distance to rest. ft. | 117-MC. | Standard. ----------------------------------------- 60 | 150 | 270 50 | 94 | 170 40 | 70 | 108 30 | 40 | 60 Hs{Lord Ernest Hives - Chair}/W.A. Robotham. | ||