Accession Number:

AD0274571

Title:

CALCULATED MODE SHAPES AND PRESSURE DISTRIBUTIONS AT FLUTTER FOR A HIGHLY TAPERED HORIZONTAL TAIL IN SUBSONIC FLOW

Descriptive Note:

Corporate Author:

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON D C

Personal Author(s):

Report Date:

1962-04-01

Pagination or Media Count:

46.0

Abstract:

The mode shapes and pressure distributions of a highly tapered horizontal-tail surface moving in its flutter mode are determined by the subsonic kernel-function method for calculating unsteady aerodynamic loads. The tail surface investigated was previously flutter tested at Mach numbers from 0.75 to 1.20, and a kernel-function flutter analysis was performed for Mach numbers from 0 to 0.98 and reported in NASA TN D-379 AD-241 923. The present investigation covers Mach numbers from 0.50 to 0.90 at reduced frequencies determined from the analytical flutter investigation. Those regions of the tail which absorb energy from the airstream at flutter are identified. The boundaries of these regions do not change appreciably with Mach number in the range investigated however, a decrease in the aerodynamic stiffness forces with increasing Mach number is indicated. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE