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).
Comparison of valve, port, and cam specifications for Goshawk I and 11 engines.
| Identifier | ExFiles\Box 48\4\ Scan077 | |
| Date | 26th October 1922 | |
| Mr. Hives. from TMW. X4226 26.10.22. GOSHAWK 1 and 11. Valves, ports and Cams compared. Gos.1 valve ports 1.4" dia. Gos.11. " " 1.2 and 1.3" dia. Gos.1 valves 1.25" dia. Gos.11 " 1.20" " Gos.1 Exhaust V.lift. .378" Gos.11 " " " .330" Gos.1 Inlet " " .358" Gos.11 " " " .330" (.010" Tappet clearance in all cases.) TMW. | ||