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 acceleration figures for the 20 HP car.
| Identifier | ExFiles\Box 113\2\ scan0124 | |
| Date | 13th May 1927 | |
| To D/L. from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} [Handwritten]: X1725 Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}4/LG13.5.27. 20 HP. ACCELERATION. [Handwritten]: X1728 [Handwritten and crossed out]: X5770 With reference to the attached. Herewith the acceleration curve for 20 HP. RR. car. A good average figure from 10 to 50 m.p.h. on top gear is 1/2 a min. From 4 to 50 m.p.h. on top gear we estimate it would take about 35 secs. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||