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).
Performance graph showing Horse Power at Road Wheels vs. Engine R.P.M. for Standard Phantom and S.S. chassis.
| Identifier | ExFiles\Box 92\2\ scan0055 | |
| Date | 7th February 1929 | |
| B.H.P. AT ROAD WHEELS ENGINE R.P.M. 3RD GEAR HORSE POWER AT ROAD WHEELS STANDARD PHANTOM AND S.S. CUT OUT CLOSED STANDARD PHANTOM AVERAGE STANDARD PHANTOM MINIMUM S.S. CHASSIS (21EX & 23EX) CUT OUT OPEN 2000 R.P.M AV: PHANTOM 90.7 B.H.P. MIN: PHANTOM 86.1 B.H.P. S.S. CHASSIS 98 B.H.P. S/L | ||