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).
Calculation of aerodynamic coefficient 'K' for a car based on its frontal area.
| Identifier | ExFiles\Box 161\1\ scan0156 | |
| Date | 2nd August 1938 guessed | |
| Frontal area of car 21.6 sq. ft. K = .024 / 21.6 = .00110 Calculated K = .00086 Actual K is 28% higher than wind tunnel K but 40% lower than previous streamline car. Rm.{William Robotham - Chief Engineer} | ||