Variable Geometry Aerofoils As Applied To The Beatty B-5 And 8-6 Sailplanes

Authors

  • R. Streather

Keywords:

Aerodynamics, Structures, Design

Abstract

Two variable-geometry aerofoils using flexible surfaces have been developed by Beatty for his B-5 and B-6 sailplanes. The B-5 has a basic Eppler 1001 section with a flexible upper surface which is raised to form a thick, high-camber profile for thermalling. The B-6 uses a Wortmann FX 05-H-126 section with flexible upper and lower surfaces over the rear 40% of the chord. Predictions for tne polars of the two sections using the Eppler and NASA viscous, two-dimensional computer programs are presented. Predictions for the overall aircraft polars are compared with flight-test measurements obtained by conventional methods and by using a prototype glide-angle indicator.

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Issue

Vol. 8 No. 1 (1983)

Section

Articles

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