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).
Calculated horsepower required for a Phantom II to achieve 100 MPH, referencing a graph and comparing to Bentley performance.
| Identifier | ExFiles\Box 92\2\ scan0111 | |
| Date | 1st May 1931 | |
| HS{Lord Ernest Hives - Chair}/RM.{William Robotham - Chief Engineer} FROM E.{Mr Elliott - Chief Engineer} COPY. E4/M2. 5. 31. U. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} re. HP. REQUIRED ON P. 2. TO ACCOMPLISH 100 MPH. We send herewith Lec. 2913. shewing a graph of HP. required for various road speeds developed from a curve given for 10-EX. in HS{Lord Ernest Hives - Chair}/RM{William Robotham - Chief Engineer}/LG301125., which curve appears to increase approximately as road speed to the 2.7 power, neglecting any constants due to tractive resistance, etc. This appears to indicate a HP. within the neighbourhood of 195. to accomplish 100 MPH., but this is of course very approximate. We also shew on this graph the speeds accomplished by the speed 6. and 7 litre Bentleys. We think it would be a useful thing if you could construct a curve of this nature up to the speed shewn more accurately and applicable to the body fitted to out continental model P. 2. Would you kindly return a blueprint of Lec. 2913 for filing purposes. E.{Mr Elliott - Chief Engineer} | ||