Wind-tunnel Investigation at Low Speed of the Lateral Control Characteristics of an Unswept Untapered Semi-span Wing of Aspect Ratio 3.13 Equipped with Various 25-percent-chord Plain Ailerons

A wind-tunnel investigation was made at low speed to determine the lateral control characteristics of an unswept untapered semi span wing of aspect ratio 3.13 equipped with 2%-percent-chord plain unsealed ailerons having various spans and spanwise locations. In general, changes in the wing angle of attack, aileron deflection, aileron span, and aileron spanwise location produced trends in the lateral control characteristics that were similar to but of different magnitude from those for unswept wings of higher aspect ratio. An aileron of a given percent span was most effective in producing roll when located outboard on the wing semi span, and this aileron also retained the greater part of its effectiveness through the angle-of-attack range in this spanwise position. The rate of change of hinge-moment coefficient with angle of attack Ch(alpha) was relatively unaffected by aileron span and spanwise location. The rate of change of hinge-moment coefficient with aileron deflection Ch(delta) became more negative as the span of outboard ailerons was increased and also as a half-span aileron was moved inboard on the semispan wing.