EFFECT OF STABILIZER LIFT ON SAILPLANE PERFORMANCE

Judson Bauman

Abstract


Since the sailplane represents a highly optimized aerodynamic form, the influence on performance of small effects such as stabilizer lift is worth considering. This paper analyzes the induced drag of the stabilizer and its effect on sinking speed. An equation is derived relating the fractional increase in sinking speed to the stabilizer lift coefficient and the aircraft's shape parameters. The equation for aircraft pitching moment in steady flight is introduced in order to obtain the relationship between fractional increases in sinking speed and airspeed and center of gravity location. Data from a Schleicher K-8B is used to illustrate the resulting formula. It is concluded that non-zero stabilizer lift increases sinking speed and for a K-8B the greatest effect is with a forward C.G. position and a high airspeed.

Keywords


Aerodynamics, Structures, Design

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