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Stability and Control Flight Tests of a Vertically Rising Airplane Model Similar to the Lockheed Xfv-1 Airplane (en Inglés)
Nasa Technical Reports Server (Ntrs)
(Autor)
·
Robert H. Kirby
(Autor)
·
Bibliogov
· Tapa Blanda
Stability and Control Flight Tests of a Vertically Rising Airplane Model Similar to the Lockheed Xfv-1 Airplane (en Inglés) - Kirby, Robert H. ; Nasa Technical Reports Server (Ntrs)
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Reseña del libro "Stability and Control Flight Tests of a Vertically Rising Airplane Model Similar to the Lockheed Xfv-1 Airplane (en Inglés)"
This paper presents the results of an investigation of the dynamic stability and controllability of a model which approximately represents the Lockheed XFV-1 airplane to a 1/8 scale. The investigation consisted of hovering flights in still air at a considerable height above the ground, hovering flights very close to the ground, vertical take-offs and landings, flights through the transition range from hovering to normal forward flight, and sideways translational flights. The model could be flown smoothly and easily in hovering flight despite the fact that the uncontrolled pitching and yawing motions were unstable oscillations. There was a noticeable reduction in the controllability of the model when hovered very close to the ground but take-offs could be made easily and landings on a g, ven spot could be made accurately in spite of this adverse ground effect. Flights through the transition range from hovering to normal forward flight could be performed fairly easily. The model seemed to have stability of angle of attack and angle of roll over most of the transition range. The yawing motion was divergent in the very high angle-of-attack range but could be controlled easily. At the lower angles of attack, the model seemed to become stable in yaw. In sideways flight there was an increasingly strong tendency to diverge in roll as the speed was increased and finally, at a speed of about 25 knots (full scale), the model rolled off despite efforts of the pilot to control it
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