Answer: windmilling

AnswerCrossword Clue
windmilling(of the propeller or rotor of an aircraft, or the aircraft itself) Spin unpowered
windmillingMove (one's arms) around in a circle in a manner suggestive of the rotating sails or vanes of a windmill
windmillingWINDMILL, to rotate from the force of air
windmilling(of one's arms) Move in such a way