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 Brake Horsepower of 'Falcon' engines for Series 1, 2, and 3 at various speeds.
| Identifier | ExFiles\Box 36\2\ scan 058 | |
| Date | 6th May 1919 guessed | |
| -1- COMPARATIVE POWERS OF "FALCON" ENGINES OF VARIOUS SERIES. SPEED | B.H.P. R.P.M. | Series 1. | Series 2. | Series 3. | Series 4. | Series 5. 1500 | 181.5 | 200 | 208 | | 1600 | 193.5 | 213 | 221 | | 1700 | 205 | 225.5 | 235 | | 1800 | 215 | 236.5 | 247 | | 1900 | 224 | 245.5 | 259 | | 2000 | 230 | 253 | 270 | | 2100 | 231.5 | 259 | 278 | | 2200 | - | 263 | 282 | | 2300 | - | 264.5 | 283 | | | ||