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).
Hand-drawn graph comparing Flywheel Brake Horsepower (B.HP) against Engine R.P.M. for the 'New Phantom' and 'Bentley' models.
| Identifier | ExFiles\Box 69\4\ scan0293 | |
| Date | 3rd November 1925 guessed | |
| FLYWHEEL B.H.P. ENGINE R.P.M. BENTLEY NEW PHANTOMCodename for PHANTOM I Y-Axis: 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140 X-Axis: 500, 1000, 1500, 2000, 2500, 3000 | ||