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).
The economic running speed and fuel consumption of an airship engine, likely named 'Moby Dick'.
| Identifier | ExFiles\Box 151\3\ scan0135 | |
| Date | 21th January 1930 guessed | |
| II Since the speed of an airship varies not as ³√HP it does not pay to use full throttle work for ordinary purposes, and we estimate the most economic and satisfactory speed to fly Moby Dick is going to be somewhere around 1400 r.p.m, or even lower, or else just one unit (2 engines) running at 1600 r.p.m. The radiators being retractable any emergency full throttle work could be accommodated by lowering them till normal temperatures are reached i.e. circ. 80°C. If we can lower [raise crossed out] the specific consumption at 1400 r.p.m by .05 pts/BHP/hr you will appreciate it is going to save us thousands of gallons on long flights – no mean consideration | ||