donkey
 n.— «Contrary to myth, a helicopter doesn’t necessarily fall out of the sky when the engine, affectionately known among pilots as the “donkey,” stops. The machine can glide to a survivable landing (albeit a brick-like one), much as a sycamore seed rotates to the ground, but only if the pilot makes the right moves, and quickly.» —“Get your rotors running: learn to fly a helicopter” by Tony Newton Belfast Telegraph (Ireland) June 5, 2006. (source: Double-Tongued Dictionary)

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