Longitudinal Stability and Control of a Ducted-Rotor Flying Platform (1)

摘要

An analysis is presented for the prediction of the longitudinal stability and control characteristics of a ducted-rotor Flying Platform. The stability characteristics of this vehicle are corroborated by the investigations and exhibited rather clearly by various stability diagrams. Artificial stabilization is discussed and can be used to stabilize certain configurations. The predictions of excessive trim requirements and large tilt angles for forward flight are substantiated. Also, the effects of changing duct design and vertical center of gravity location on the stability derivatives are discussed, and material is presented to reflect the degree to which these changes can be used as aids in stabilizing the Platform.