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).
List of Goshawk size fans tested, detailing their descriptions and fan tip diameters.
| Identifier | ExFiles\Box 75\3\ scan0036 | |
| Date | 21th January 1925 | |
| X1017 21.1.25. X.1017. LIST OF GOSHAWK SIZE FANS. Nos. & Descriptions of fans tested. Fan tip dia. 4. Hispano fan. 17½" 7. Goshawk. 18" 21. Wide bladed fan. 18" 22. No.21 with 1" cut off leading edges. 18" 23. No.22 with leading edges rounded off. 18" 24. Fan similarly proportioned to the EAC. expl. fan, but with curvature the same as that of the Hispano. 18" | ||