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).
With graphs comparing the acceleration of Phantom and Vauxhall vehicles.
| Identifier | ExFiles\Box 113\2\ scan0105 | |
| Date | 12th June 1925 | |
| R.R. 493a (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REF: Hs{Lord Ernest Hives - Chair}/An/1.014.12.25 GRAPH 1. Individual readings only given for 117-MC. thus x these shew the rather erratic nature of the test. Acc'n. Ft./Sec.² ROAD SPEED. M.P.H. SUMMERS' PHANTOM 117MC. ----- STANDARD PHANTOM 98MK. _____ We have taken the mean of all the figures for the Phantom acceleration. Those opposite the Vauxhall figures in the report are poor, those given from 10 m.p.h. are unusually good. GRAPH 11. Individual readings only given for Vauxhall. Thus ☉ Acc'n. Ft./Sec.² ROAD SPEED. M.P.H. VAUXHALL ----- 117-M.C. _____ | ||