United States Department of Transportation
i
Simplified methods of predicting aircraft rolling moments due to vortex encounters
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1977-05-01
[PDF-1.48 MB]
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NTL Classification:AGR-SAFETY AND SECURITY-SAFETY AND SECURITY;NTL-AVIATION-AVIATION;NTL-AVIATION-Air Traffic Control;NTL-AVIATION-Aviation Safety/Airworthiness;
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Abstract:Computational methods suitable for fast and accurate prediction of rolling moments on aircraft
encountering wake vortices are presented. Appropriate modifications to strip theory are developed which account for the effects of finite wingspan. It is shown that in the case of an elliptic wing the aspect ratio corrertion to the lift curve slope should be based on the semispan. A reciprocal theorem is used to relate the rolling moment on a wing in an arbitrary downwash field to that on a wing in steady rolling motion. Calculations are presented for a wing encountering a vortex with a Betz velocity distribution. It is shown that the ratio of
the spans of the generating and encountering aircraft is the most significant parameter in
determining the possible hazard.
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