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As the aircraft becomes lighter, it flies higher in air of lower density to maintain the same airspeed.
This false perception of descent may cause the pilot to pull back on the stick, which would reduce airspeed.
Develop a compact, laser based sensor that can accurately measure the airspeed at all altitudes.
Whilst engaged on operational tasks the plane cannot hover like a helicopter, it requires airspeed of about 50 mph to remain airborne.
Thus, the effect of the varying airspeed as a result of blade rotation is nullified.