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 performance of standard versus long duration cams on Engine No 35 - Vickers Scout.
| Identifier | ExFiles\Box 43\3\ Scan188 | |
| Date | 21th September 1928 guessed | |
| SHEET 2 R.R. FxI S ENGINE No 35 - VICKERS SCOUT .632 GEAR RATIO COMPARATIVE TESTS OF STANDARD & LONG DURATION CAMS GROUND LEVEL CONDITIONS ENGINE THROTTLED TO + 2.5" HG. CONSTANT BOOST PRESS: (30.17" HG. A.B.S) CORRECTIONS APPLIED FOR STANDARD AIR TEMPERATURES OF 15°C REFERENCE TO CURVES x ----- ORIGINAL TEST FIGURES PRIOR TO DELIVERY TO VICKERS ⊕ ------ TEST BED FIGURES AFTER FLYING EXPERIMENTS ☉ ------ TEST BED FIGURES WHEN FITTED WITH LONG DURATION CAMS BRAKE HORSE POWER CRANKSHAFT R.P.M. | ||