Graph comparing the horsepower versus RPM of an 'Sg's Engine' with new components against average Bentley and Wraith engines.
| Identifier | ExFiles\Box 109\5\ scan0127 | |
| Date | 3rd March 1939 | |
| Sg {Arthur F. Sidgreaves - MD} 's ENGINE TESTED ON UNIT BED 3-3-39 NEW CYL BLOCK NEW CAMSHAFT (BENTLEY) NEW PISTONS H.P R.P.M AVERAGE BENTLEY AVERAGE WRAITH Sg. {Arthur F. Sidgreaves - MD} ENGINE | ||
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).