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).
Report page comparing the mechanical efficiencies of two models and noting a drop in horsepower.
| Identifier | ExFiles\Box 113\2\ scan0036 | |
| Date | 26th April 1923 guessed | |
| contd:- -3- From graph 'G', that the mechanical efficiencies of the two models are very much the same. Graph 'F' confirms the large drop between the clutch and road wheel H.P., and emphasises the need for investigation in that direction. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||