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 comparison tables for the Wraith and Bentley III systems, including acceleration and hill climb data.
| Identifier | ExFiles\Box 122\4\ scan0203 | |
| Date | 31th October 1938 | |
| -2- Rm{William Robotham - Chief Engineer}/GR.{George Ratcliffe}3/JH.31.10.38. PERFORMANCE. M.P.H. MEAN TIME - SECONDS IMPROVEMENT IN PERFORMANCE OR % REDUCTION IN TIME WITH BENTLEY III SYSTEM. WRAITH SYSTEM. B.III SYSTEM. 10 - 30. 9.5 8.4 11.6% 10 - 40. 14.7 13.0 12.4 10 - 50. 20.1 18.2 9.5 10 - 60. 27.3 24.6 9.8 Acceleration figures deduced from curves. M.P.H. ACCELERATION - FT/SEC.2 IMPROVEMENT IN ACCELERATION WITH B.III SYSTEM. WRAITH SYSTEM. B.III SYSTEM. 20 3.00 3.35 11.6% 30 2.95 3.32 12.5 40 2.75 3.15 14.5 50 2.35 2.75 17.0 60 1.85 2.00 8.0 HILL CLIMB. WRAITH SYSTEM. BENTLEY III SYSTEM. TIME. 63 secs. 59 secs. MAX. SPEED. 58 M.P.H. 62 M.P.H. | ||