Abstract

Morphing technologies are a major thrust in current unmanned aerial vehicle (UAV) research. A morphing wing is one that can change its geometry to accommodate multiple flight regimes. Wing morphing methods include the following: camber change, aspect ratio change, twist change and wing sweep change. This paper explores the effect of changes in aspect ratio on the stability properties of UAVs. Stability coefficients are calculated in order to verify that variable aspect ratio (VAR) wings maintain stability during symmetric changes in span. Wind tunnel test data is used to validate models of the variation of roll and yaw moment with symmetric changes in aspect ratio. This paper presents a preliminary study of the stick fixed free response of a generic VAR UAV with symmetric changes in span.

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