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).
Table comparing the required horsepower and improved acceleration due to streamlining for a Bentley versus a Dubonnet car.
| Identifier | ExFiles\Box 161\1\ scan0033 | |
| Date | 6th April 1936 | |
| -3- Hs{Lord Ernest Hives - Chair}/RM.{William Robotham - Chief Engineer}16/KW.6.4.36. | H.P. required to drive the car. | Improved Acceleration due to Streamlining. | |---|---|---|---| | Road Speed M.P.H. | Bentley | Dubonnet | | | 40 | 20 | 12.5 | 7½% | | 60 | 47 | 24 | 28% | | 80 | 105 | 48 | 325% | This assumes the weight of the two cars to be identical. | ||