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 comparing an Sg's engine test against average Bentley and Wraith engine curves.
| Identifier | ExFiles\Box 109\5\ scan0128 | |
| Date | 3rd March 1939 | |
| Sg{Arthur F. Sidgreaves - MD}'s ENGINE TESTED ON UNIT BED NEW CYL BLOCK NEW CAMSHAFT (BENTLEY) NEW PISTONS 3-3-39 H.P R.P.M AVERAGE BENTLEY AVERAGE WRAITH Sg.{Arthur F. Sidgreaves - MD} ENGINE 100 90 80 70 60 50 40 30 1000 1500 2000 2500 3000 3500 4000 4500 | ||