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).
The average speeds and times for a 20 HP chassis over several test hills.
| Identifier | ExFiles\Box 113\2\ scan0109 | |
| Date | 7th January 1926 | |
| f488 X488 f457K 7.1.26. AVERAGE SPEEDS & TIMES OF 20 HP. CHASSIS. WEIGHT 31 CWTS. STANTON HILL. (Short hill over Swarkstone Bridge). Start - first telegraph post on left 10 m.p.h. Finish- last " " " 19 m.p.h. TICKNALL HILL. Time taken from rails at bottom of long hill, and finish at gate on left just at the top. Start at rails 10 m.p.h. } Finish at gate on left at top of hill 39 m.p.h. } Time 1 min. 25 secs. [Crossed out text]: ixminxxxkx25xckmx. PISTERN HILL. Times taken from tree on left just past lane-end and finish at caution sign on right just before farm. Start at tree 10 m.p.h. max. speed 39 m.p.h. - 10 mins. Finish at sign Time 2 mins. 6 secs. HAZELWOOD HILL (Duffield side) Start at sign post on right on grass-plot. Finish at telegraph post on left almost opposite danger board on right. Start at sign post 25 m.p.h. min. speed 10 m.p.h. Finish at telegraph post - Time 1 min. 6 secs. QUARNDON HILL (Off Duffield Rd.) Start at 1st. tree on right from Duffield Rd. Finish at Gate on left at top of the hill. Start at tree 10 m.p.h. min. speed 13 m.p.h. Finish at Gate on left - Time 1 min. 42 secs. ----------------------- | ||