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).
Graph and analysis of the horsepower required to overcome wind resistance at various road speeds.
| Identifier | ExFiles\Box 69\4\ scan0313 | |
| Date | 9th April 1926 guessed | |
| contd : -2- If on the other hand the car is originally travelling at 60 m.p.h. and a head wind of 10 m.p.h. again blows upon it, the extra H.P. necessary to keep the car going is 20 HP. In other words a 10, m.p.h. head wind at 60 m.p.h. has 3.3 times the effect of the same wind at 30 m.p.h. Graph Text: Title: POWER OF WIND AT VARIOUS ROAD SPEEDS Graph Label: GRAPH II Y-Axis Label: H.P TO OVERCOME WIND RESISTANCE X-Axis Label: ROAD SPEED M.P.H. Annotations on curve: 30-40. 6 H.P. 60-70. 20 H.P. Hs{Lord Ernest Hives - Chair}/W.A.Robotham. | ||