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 Brake Horsepower (B.HP) versus Revolutions Per Minute (R.P.M.) for a complete standard exhaust system.
| Identifier | ExFiles\Box 125\3\ scan0060 | |
| Date | 5th July 1938 | |
| 6 B.4. 5TH JULY 1938 BAROMETER 750 M.M. 6.50 x 17 WHEELS 10:43 AXLE RATIO COMPLETE STANDARD EXHAUST SYSTEM B.H.P. 90 85 80 75 70 65 60 R.P.M. 2000 2500 3000 3500 4000 | ||