Online Community of Zenith Builders and Flyers
With Roger flying the STOL CH 750, I tracked his speeds with a handheld radar (just like the police use in speed traps). The unit is actually a "stationary Dopplar radar" with a "conical microwave antenna."
With no winds, we tested the aircraft IAS with flaps up and with flaps down (Vso + 5, and all the way up at various increments). Our indicated speeds are quite accurate!