Wind-tunnel tests to determine the flutter characteristics of a model wing, carrying a localised mass, are described. The investigation covers the effects of wing sweepback, and of the magnitude and position of the localized mass. Consideration is also given to the effects of pitching radius of gyration and aerodynamic shape. The mass values-used vary from 0•13 to 1•17 times the wing mass. The test results indicate that the parameters that have the greatest effect on critical flutter speed are mass value, spanwise and chordwise position of the localised mass, and wing sweepback. Radius of gyration and aerodynamic shape of the localised mass are found to be secondary in their effects. It was found that the flutter speed of a wing could be considerably increased or decreased by attaching a localized mass ; under certain conditions the flutter speed could be more than doubled.
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