English

DTIC AD0265189: PYROLYTIC REFRACTORY MATERIALS FOR SOLID-FUEL ROCKET MOTOR APPLICATIONS

The effect of ground proximity on the aerodynamic characteristics of aspect-ratio-1 airfoils was investigated. The investigation was made with the model moving over the water in a towing tank. The results indicated that, as the ground was approached, lift-drag ratio was increased. The profile drag remained essentially constant for each airfoil. Near ground, the addition of end plates to the airfoil resulted in a large increase in lift-drag ratio. Lift characteristics of the airfoils indicated stability of height at positive angles of attack and instability at negative angles; therefore, the operating range of angles of attack would be limited to positive values. At positive angles of attack, static longitudinal stability was increased as height above the ground was reduced.

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