A device, system, and method for measuring the airspeed of a slow moving aircraft are disclosed. The device comprises a pitot tube at the end of a rotating arm. When installed on an aircraft, the pitot tube is exposed to a relative wind that is the result of the sum of the speed due to rotation and the forward speed of the aircraft. The pressure is turned into an electrical signal by a pressure sensor. This pressure sensor’s output is processed by an electronic unit which extracts the aircraft’s airspeed, ignoring the speed due to rotation. The difference between the highest and the lowest pressure is an indication of the aircraft’s airspeed.
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"AIRSPEED MEASUREMENT DEVICE FOR SLOW AIRCRAFT", Technical Disclosure Commons, (January 02, 2019)