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).
Performance figures for 'g's. Wraith car, including acceleration times and maximum speed.
| Identifier | ExFiles\Box 109\5\ scan0118 | |
| Date | 28th February 1939 | |
| 664 To La.{L. A. Archer} c. to Mx.{John H Maddocks - Chief Proving Officer} Rm{William Robotham - Chief Engineer}/FD.{Frank Dodd - Bodies}9/JH.28.2.39. 'g's. Wraith. Herewith performance figures for 'g's. car as received, speedometer not corrected, figures will be used for comparison purposes when high compression pistons and new camshaft are fitted. Acceleration. 10 - 30 - 9.35 secs. 10 - 40 - 14.7 secs. 10 - 50 - 20.05 " 10 - 60 - 29.55 " 10 - 70 - 42.27 " Maximum car speed on six Hills (new road section) average of both ways 79.5 m.p.h. on clock. Ticknall Hill on 27.2.39. against wind 70 secs. Ignition timing checked at T.D.C. Rm{William Robotham - Chief Engineer}/FD.{Frank Dodd - Bodies} | ||