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).
Page of calculations for vehicle windage, total tractive resistance, horsepower and maximum speed.
| Identifier | ExFiles\Box 161\1\ scan0155 | |
| Date | 30th July 1938 guessed | |
| WINDAGE. = Total T.R. - Rolling T.R. (1) = 172 - (30 x Wt. of Car) = 172 - 45 = 127 (2) = 150 - (30 x Wt. of Car) = 150 - 45 = 105 K = Windage T.R. / M.P.H.² (i) K = 127 / 75² = .0227 (2) K = 105 / 65² = .0346 Mean K = .024 At 110 M.P.H. windage = 290 Total T.R. = 290 + 45 = 335 Velocity 161 ft/sec. H.P. = (161 x 335) / 550 = 98 B.H.P. If speedometer 5 M.P.H. fast at 80, max. speed will be 104 M.P.H. Continued. | ||