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In life we get opportunities to make decisions that will either change our lives for the better or pose problems for years to come. Exploring these "hinge moments," Gordon College president Michael Lindsay shares faith-based stories of success and failure from his ten-year study of other leaders, providing both practical and spiritual insights for making the most of each stage of life.
Summary: The results of a theoretical analysis of the hinge-moment characteristics of various sealed-internal-balance arrangement for control surfaces are presented. The analysis considered overhangs sealed to various types of wing structure by flexible seals spanning gaps of various widths or sealed to the wing structure by a flexible system of linked plates. Leakage was not considered; the seal was assumed to extend the full spanwise length of the control surface. The effect of the developed width of the flexible seal and of the geometry of the structure to which the seal was anchored was investigated, as well as the effect of the gap width that is sealed.

Report

United States. National Advisory Committee for Aeronautics

Published: 1949

Total Pages: 24


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Fatigue tests have been conducted to determine the effect of bolt fit upon the lifetime of lap joints of 24S-T Alclad sheet of various thicknesses joined by steel bolts an designed for sheet failure under repeated loading.
Theoretically derived charts showing steady-state and first- and second-harmonic flapping coefficients are presented for helicopter rotors having hinged rectangular blades with a linear twist of 0, -8, and -16 degrees. The charts, showing the rotor flapping coefficients for combinations of inflow ratio and blade pitch angle, are presented for tip-speed ratios ranging from 0.05 to 0.50.