Even so, the flight characteristics were not totally satisfactory. The aircraft was characterized by good ground handling, good takeoff and landing, but the pilot's cockpit was set too low in the fuselage and at an excessive height from the ground, so the visibility was not good. In flight, the aircraft was quite stable, but vibrations occurred at high speed in turbulence, and control response was considered sluggish. Also, the first series example was affected by several problems of tail vibration and even poorer control response. The maximum speed of the series examples was inferior to the prototype. Several of the pre-series aircraft suffered landing accidents, which although not serious further delayed the project's development.