An experimental investigation has been made to determine the dynamic sta¬bility and control characteristics of a 0.13-scale flying model of a vectored-thrust jet vertical-take-off-and-landing (VTOL) airplane in hovering and tran¬sition flight. In hovering flight in still air the model could be flown smoothly and easily, and there was no noticeable change in trim, stability, or lift due to proximity to the ground for hovering flight when the model wheels were 3 inches or more above the ground. Vertical take-offs and landings in still air could be made smoothly and easily although there was a longitudinal trim change caused by a nose-up pitching moment when the wheels were less than 2 inches above the ground. Transitions from hovering to forward flight and back to hovering could be made smoothly and consistently. The model was longi-tudinally stable in the high-speed part of the transition range and in low-speed conventional flight, but was neutrally stable in the low-speed part of the transition range.
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