Initial Results of a Flight Investigation of the Wing and Tail Loads on an Airplane Equipped with a Vane-controlled Gust-alleviation System
Initial Results of a Flight Investigation of the Wing and Tail Loads on an Airplane Equipped with a Vane-controlled Gust-alleviation System

Author: T. V. Cooney

Publisher:

Published: 1956

Total Pages: 31

ISBN-13:

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Results are given of an analysis of wing and horizontal-tail spar strains measured on a twin-engine light transport airplane which was modified for the installation of a control system to alleviate airplane motions in turbulent air and thus improve passenger comfort. From a sample of the measurements obtained in flight through clear-air turbulence, normal acceleration at the airplane center of gravity was reduced 43 percent, wing main-spar bending strains were reduced, and wing-spar shear strains were increased. Horizontal-tail shear and bending strains were increased. Measurements of aerodynamic loads obtained in a pull-up with the gust-alleviation system in operation are also presented.

Probability and Frequency Characteristics of Some Flight Buffet Loads
Probability and Frequency Characteristics of Some Flight Buffet Loads

Author: Wilber B. Huston

Publisher:

Published: 1956

Total Pages: 684

ISBN-13:

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The frequency characteristics and statistical properties of the buffet loads measured on the unswept wing and tail of a fighter airplane have been studied in the stall and in the shock regime. The results indicate that the wing loads in buffeting can be treated as the Gaussian response of a simple elastic system. The tail loads appear to represent a more complicated pattern.