Large-scale wind-tunnel investigation of a model with an external jet-augmented flap

An investigation has been conducted i n t h e Ames 40by 8 0 -~o o t Wind Tunnel of a large-scale model powered by t u r b o j e t engines.The wing had 38.5O sweep of t h e leading edge, an aspect r a t i o of 5.38, a t a p e r r a t i o of 0.23, and a dihedral of 3 O .The t r a i l i n gedge f l a p s extended from 8 t o 63 percent semispan.spanned t h e main f l a p .The exhaust from t h e engines w a s d i r e c t e d against t h e f l a p s t o augment l i f t .The wing a i r f o i l s e c t i o n w a s an NACA 65-412.A s m a l l a u x i l i a r y f l a p Longitudinal aerodynamic c h a r a c t e r i s t i c s f o r various combinations of main and a u x i l i a r y f l a p deflections a r e shown f o r t h r u s t c o e f f i c i e n t s f r o m 0 t o approximately 1.4.t i c s a r e shown f o r a simulated engine-out condition.Results a l s o demonstrate t h e f e a s i b i l i t y of using t h e s m a l l a u x i l i a r y f l a p as a means f o r providing d i r e c t -l i f t f l i g h t -p a t h control.Limited longitudinal and l a t e r a l -d i r e c t i o n a l c h a r a c t e r i s -