Flight tests were conducted with a light airplane equipped with a cross-wind landing gear to compare the ground distance required for take-off in calm air and with a 90 degree cross wind. These tests show that approximately 24 percent less ground run was required to attain take-off speeds of 40 to 50 miles per hour in a 16-mile-per-hour 90 degrees cross wind than in calm air.

The aerodynamic forces and moments exerted on pitched and yawed wing-body combinations consisting of a slender body of revolution and a cruciform arrangement of thin wings have been investigated by two theoretical methods. One method, an extension of the slender wing-body theory of NACA TN No. 1662, makes possible the determination of simple closed expressions for the load distribution, of simple closed expressions for the load distribution, the forces, and the moments for slender cruciform-wing and body combinations in which the wings may be dissimilar plan form. The second method treats cruciform-wing and body combinations consisting of a body of revolution and identical wings of arbitrary aspect ratio and plan form. The results are valid at subsonic, transonic, and supersonic speeds.