at angles of attack greater than 2'. Addition of canards caused a decrease in long- tudinal stability and an ir~crease in directional stabilitv. Oil-flow studies revealed exten- sive areas of separated and vortex flow on the fuselage lee surface. A limited comparison of wind-tunnel data wlth several hypersonic approximations indicated that. except for the directional stability, the tangent-cone method gave adequate agreement at control settings between 50 and -50 and positive lift coefficient.

Louis E. Clark

Papers

Research aircraft configuration