Comparative table detailing the specifications of Goshawk 11, 40/50 HP, and Marmon radiators.
| Identifier | ExFiles\Box 77\4\ scan0340 | |
| Date | 14th September 1923 | |
| X4240 DETAILS OF GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) 11. AND 40/50 HP. RADIATORS. X4240 X.3456 14.9.23. | Details | Present G.11 Rad. E.51467. | Exptl: G.11. Rad. E.52161. | 40/50 HP. standard. | Marmon. | |---|---|---|---|---| | Dimensions of matrix. | Height 19" Breadth 21.6" | Height 19.7" Breadth 20.825" | Height 20.25" Breadth 24" | | | Length of tube. | 3.95" | 3.5" | 4.8" | 3" | | Number of tubes, | 69 X 69 4761 | 71 X 67 4757 | | Diagonal | | Overall area - matrix face. | 410.4 sq.in. 2647 sq.cms. | 410.25 sq.in. 2645 sq.cms. | 486 sq.in. | 449.5 sq.in. | | % free air passage of total face. | 70% | 70% | 70% | | | Volume. | 1620 cu.ins. .934 cu.ft. | 1435 cu.ins. .831 cu.ft. | 2332 cu.ins. 1.349 cu.ft. | 1348.5 cu.ins. .778 | | Wt. of air passing per Hr. through the core at 95° F. {Mr Friese} | 900 f.p.m 7.800 1800 f.p.m 15.600 3600 f.p.m 31.200 | | 9.175 18.350 36.700 | | | Surface of core per inch of depth. | 26 sq.ft. | 26.2 sq.ft. | 30.75 sq.ft. | 32.9 sq.ft. | | ||
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).