A THEORETICAL INVESTIGATION OP THE AERODYNAMICS OF WING-TAIL COMBINATIONS PERFORMING TIME-DE PENDENT MOTIONS AT SUPERSONIC SPEEDS

摘要

A theoretical investigation is presented of the contribution of horizontal tails to the lift and pitching moment due to angle of attack, a constant rate of pitch, and a constant vertical acceleration. Numer¬ical values of the aerodynamic coefficients associated with these motions are presented for a number of two-dimensional wing-tail combinations, a triangular wing-tail combination, and a number of rectangular-wing— triangular-tail combinations.nMethods for calculating the flow fields behind wings with constant vertical acceleration are developed. Calculated results are presented for the upwash behind two-dimensional wings and for certain regions behind triangular and rectangular wings for a constant rate of pitch and for constant vertical accelerations. A method of treating unsteady aerodynamics based on an infinite series of stability derivatives of succes¬sively higher order is also presented.