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This report reveals information relating to flutter research with military implications to aircraft design. Since the safeguarding of this information is necessary in the interests of national security, this report, exception the title, has been classified "Confidential" in its entirety in accordance with paragraphs 2.s and 24.a(9) of AFR 205-1. WADC TR 53-161, Part 2 54WCLSA-416 ULNCLASSIFIED) ABSTRACT A wind tunnel model was designed, constructed, and tested in order to accumulate experimental data on the effects of systematic changes of various tip pod mass parameters and of rigid body degrees of freedom on wing flutter characteristics, and to compare these data with the results of theoretical analyses. A tapered wing with quarter chord swept back 400 was tested with heavy tip pods in cantilever, symmetric, and antisymmetric configurations. Flutter analyses were made of two selected configurations in each of the cantilever, symmetric, and antisymmetric modes. Computed results from analyses based on strip theory aerodynamics, with one exception, gave good agreement with experimental results, whereas analyses based on finite wing aerodynamics in general yielded appreciably unconservative flutter speeds.

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