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).
Attached power curve for the 20-HP engine, based on the average of 10 units from a test bed.
| Identifier | ExFiles\Box 74\4\ scan0196 | |
| Date | 13th March 1925 | |
| X. 4134 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Mx{John H Maddocks - Chief Proving Officer}/McM1/MMC13.3.25. Re: 20-HP Power Curve. Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}1/LG26.2.25. Mx{John H Maddocks - Chief Proving Officer}/McM5/MMC4.3.25. Further to above we attach hereto curve plotted from average of 10 engines on unit test bed.. Mx{John H Maddocks - Chief Proving Officer}/McM. | ||