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 showing power loss comparison for different fan types against engine RPM.
| Identifier | ExFiles\Box 104\3\ scan0225 | |
| Date | 1st March 1936 | |
| 25/30 RR POWER LOSS FAN UNIT C.17 COMP RATIO 6:1 (E60660) INLET VALVE 1.350 EXH " 1.260 INDN PIPE E60874 STROMBERG DB{Donald Bastow - Suspensions} 42 CARB (LEC 4883) STD 20/25 CAMSHAFT PISTONS E60632 (DIE CAST) ① NO FAN ② STD 20/25 FAN ③ FLEXIBLE BLADED FAN HP RPM B.M.E.P IO 5° AT IC 43° AB (TAPPETS D .020) EO 43° BB EC 11° AT CTS{C. Trot Salt - Carburation} | ||