You guys made me finally pull the trigger and buy a gps like yours. Its obvious even experts have a hard time 'eyeballing' a plane and guesstimating its speed.
Very weird that at it's terminal velocity the prop acts as an air brake, or at least doesnt accelerate the plane. I'm sure some aeronautic engineer could explain what happened.
Interesting result powered vs unpowered! I’m guessing that the prop is more of a high thrust setup for quick climbing than a high speed setup. At full power in a dive it’s probably just banging off the redline and creating drag more than anything. 95 mph unpowered is pretty damn impressive in my book! Great video!!!