WIND-TUNNEL INVESTIGATION OF SINGLE AND TANDEM LOW-ASPECT-RATIO WINGS IN GROUND EFFECT
LOCKHEED-CALIFORNIA CO BURBANK
Pagination or Media Count:
The effects of end-plate and camber changes on the aerodynamic characteristics of five basic wings in ground effect were investigated by the image technique, and the effect of gap-chord and aspect ratio was investigated on tandem-wing combinations over a ground board. For a given end-plate structural clearance height, the addition of end plates shows an increase in LD for AR-1 however, better LD is obtained with end plates off for AR-4. For a given wing trailing edge structural clearance height, end plates show considerable improvement in LD. Improved LD is also noted for a small down flap deflection, b contoured end plates, c wedge-bottom end plates, d thin wing, and e high aspect ratio. Static stability improves as the ground is approached and is particularly evident for the tandem-wing combinations. Limited data were obtained in roll and yaw.
- Fluid Mechanics