An In-Flight Investigation of Lateral-Directional Dynamics and Roll- Control Power Requirements for the Landing Approach
CORNELL AERONAUTICAL LAB INC BUFFALO NY
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Lateral-directional handling qualities and roll control power requirements for the executive jet class of airplanes in the landing approach flight phase were investigated in the USAFCAL variable stability T-33 airplane. Particular emphasis was placed on the effects of crosswinds and turbulence. Simulated IFR ILS approaches and VFR offset and crosswind approaches were made. Specifically, two Dutch roll frequencies, three Dutch roll damping ratios, three roll-to-sideslip ratios and three roll mode time constants were investigated. It was found tht for the range of parameters investigated, lateral-directional dynamics do not establish a limiting crosswind value however, they do determine the ease or difficulty with which a crosswind approach can be accomplished. Roll control power requirements were determined from actual control usage data obtained throughout the evaluation program and were found to be a function of the lateral-directional dynamics. Minimum acceptable levels of roll control power were determined by re-evaluating a number of configurations with limited roll control power. It was found that available roll control power can establish a limiting crosswind component.