Operating expenses of both types are practically same, but in case of 400-hp. engines the air-cooled one is 200 kg. lighter and will carry that extra weight of freight 160,000 km. in 1000 hr. of flight.
Financial comparison of air-cooled and watercooled airplane engines
Moteurs d'avions a refroidissement par l'air ou par l'eau
Nature (Paris) ; n 2727
1926
5 pages
4 Figs.
Aufsatz (Zeitschrift)
Englisch
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