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).
Modification of Eagle engines for use in seaplanes.
| Identifier | ExFiles\Box 37\4\ scan 070 | |
| Date | 21th June 1917 | |
| To EH. from E.{Mr Elliott - Chief Engineer} c. to EF. c. to Hy{Tom Haldenby - Plant Engineer} X.3097 E1/B21.6.17. X2030 - RE EAGLE ENGINES X.3104 As we expect to fit all Eagle engines from 1001 onwards into seaplanes, Mr. Royce thinks that the power output will probably be limited to 330 HP owing to the constant low altitude at which the machines will work. Apparently the most desirable way of accomplishing this would be to use a small throat in the carburetter. This would give us the high torque at slow speeds which is so important for getting off the water. The power curve would rise quite well in the beginning and curl over as it reached 1800 r.p.m. This is an excellent characteristic for both seaplane and land work. X.2437. We should also probably keep the usual expansion ratio and not use lower compression. This would give us good economy. X.3097 I have not raised this point with Mr Royce yet, but if you agree on the matter, perhaps you could find experimentally the size of throat which would give us the required output in combination with the valve gear, induction pipes, and pistons with which the engine is to be fitted. E.{Mr Elliott - Chief Engineer} | ||