WITH THE POWER TO IDLE AND FULL FLAPS, the Texas Aircraft Colt lingers over Texas Hill Country just above a stall. "Keep pulling, keep pulling," coaxes chief pilot and test pilot Humberto Vivanco as the airspeed dips below 40 knots on the Dynon display. Finally, the nose drops gently and uneventfully at 35 KIAS. BY SARAH DEENER P H OT O G R A P H Y B Y M I K E F I Z E R aopa.org/pilot AOPA PILOT | 67http://www.aopa.org/pilot