Comparison of the blade particulars and dimensions for a Goshawk No. 27 fan and a Hispano fan.
| Identifier | ExFiles\Box 75\3\ scan0038 | |
| Date | 5th February 1925 guessed | |
| PARTICULARS OF GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) No 27 AND HISPANO FANS. | | GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) | HISPANO | |---|---|---| | LENGTH OF BLADE | 9.0" | 8.75" | | ANGLE | 20° | 30° | | RADIUS OF ARC OF BLADE | 4.68" | 4.375" | | CHORD OF ARC | 4.50" | 3.50" | | HEIGHT OF ARC | .58" | .34" | | RATIO CHORD/HEIGHT | 7.8 | 10.3 | Diagram Labels: AXIS OF FANS 20° 4.50" .58" 30° 3.50" .34" X.1017. | ||
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).