Graph comparing the power and thrust performance of three different aircraft engine fans against fan speed.
| Identifier | ExFiles\Box 75\3\ scan0047 | |
| Date | 9th February 1925 | |
| II No FAN. 4 HISPANO-SUIZA 7 PRESENT STANDARD GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)). 27 FINAL EXPERIMENTAL GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)). POWER REQUIRED TO DRIVE FAN. (H.P.) AXIAL THRUST OF FAN IN LBS. WEIGHT. THRUST POWER FAN SPEED. (r.p.m.) H.E.W. 9-2-25 E.F.C. 9/2/25 | ||
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).