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).
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 | ||