Graph comparing the performance of various Hispano and Goshawk engine fans, plotting speed and power against axial thrust.
| Identifier | ExFiles\Box 75\3\ scan0046 | |
| Date | 3rd February 1925 | |
| I No. FAN. 4. HISPANO. 7. ORIGINAL GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)). 21. 1ST MODIFICATION. GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)). (WIDE BLADES SIMILAR TO MALTESE CROSS) 22. 2ND MODIFICATION. GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)). (NO. 21 WITH 1" CUT OFF LEADING EDGE) 23. 3RD MODIFICATION. GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)). (NO. 22 WITH LEADING EDGE ROUNDED OFF) 24. 4TH MODIFICATION. GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)). (BLADES SIMILAR TO HISPANO) 26. 5TH MODIFICATION. GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)). (SIMILAR TO 22 - 1 1/4" CUT OFF - ANGLE OF ATTACK INCREASED) 27. FINAL MODIFICATION AS 26. SPEED POWER FAN SPEED (R.P.M.) MOTOR OR ENGINE POWER REQUIRED TO DRIVE FAN. (H.P.) AXIAL THRUST OF FAN IN LBS WEIGHT H.E.W. 3-2-25 E.P.C. 3/2/25. | ||
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).