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).
Summary of power increases and specifications for the Hawk engine from 1915 to 1918.
| Identifier | ExFiles\Box 36\2\ scan 081 | |
| Date | 1st December 1918 | |
| X. 2935. EFC/AT3.12.18. INCREASE IN POWER OF HAWK ENGINE. H.P. First engine made Dec. 1915. Power at normal speed 1350 r.p.m. 83 Dates of increase in power " " Feb.1916 91 " " " " " " Apl.1916 91.5 " " " " " " Oct.1918 94 normal speed 1500 " " 105 Maximum permissable speed 1700 Quantity of water in engine 1.4 galls. Oil consumption .02 | ||