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 fan speed and power required versus axial thrust for Hispano and Goshawk fan modifications.
| Identifier | ExFiles\Box 75\3\ scan0214 | |
| Date | 3rd February 1925 | |
| I. FAN SPEED (r.p.m.) 2600 2400 2200 2000 1800 1600 1400 1200 1000 800 600 400 200 0 MOTOR OR ENGINE POWER REQUIRED TO DRIVE FAN. (H.P.) 4.0 3.5 3.0 2.5 2.0 1.5 1.0 .5 0 AXIAL THRUST OF FAN IN LBS WEIGHT SPEED POWER Graph lines are numbered: 4, 7, 21, 22, 23, 24, 26, 27 TABLE: No. | FAN. 4. | HISPANO. 7. | ORIGINAL GOSHAWK. 21. | 1ST MODIFICATION. GOSHAWK. (WIDE BLADES SIMILAR TO MALTESE CROSS) 22. | 2ND MODIFICATION. GOSHAWK. (No. 21 WITH 1" CUT OFF LEADING EDGE) 23. | 3RD MODIFICATION. GOSHAWK. (No. 22 WITH LEADING EDGE ROUNDED OFF) 24. | 4TH MODIFICATION. GOSHAWK. (BLADES SIMILAR TO HISPANO) 27. | 5TH MODIFICATION. GOSHAWK. (FINAL). HEW 3-2-25 E.P.C 3/2/25 | ||