These were typically known as putt–putts, even in official training documents. ĭuring World War II, a number of large American military aircraft were fitted with APUs. One of the first military fixed-wing aircraft to use an APU was the British, World War 1, Supermarine Nighthawk, an anti-Zeppelin Night fighter. These powered a generator for the craft's radio transmitter and, in an emergency, could power an auxiliary air blower. The Riedel APU installed on a preserved BMW 003 jet engine, with what appears to be an electric starter for the Riedel APU.ĭuring World War I, the British Coastal class blimps, one of several types of airship operated by the Royal Navy, carried a 1.75 horsepower (1.30 kW) ABC auxiliary engine.
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