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).
Table of proposed motors for the Goshawk project, detailing makers, types, diameters, and weights.
| Identifier | ExFiles\Box 51\5\ Scan006 | |
| Date | 22th April 1921 | |
| X.4342 22.4.21. X.4342 - MOTORS PROPOSED FOR GOSHAWK. Maker. Type. Dia. Weight. C. A. {Mr Adams} V. {VIENNA} SC 4" Rotax. M.T.1.L. 4½" 21 lbs. Smith 5S 4½" Smith 4LS 5" EFC. {E. Fowler Clarke - Electrical Engineer} | ||