Adjustable blowing slot for circulation control airfoil
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsJames B. Grant, George A. McCoubrey
Life of this patent
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Abstract
A circulation control airfoil having an edge slot formed by upper and lower uct panels. A plurality of struts are spaced along the length of the edge slot and are adjustably attached to the upper and lower duct to maintain the edge slot height. A reinforcing saddle is provided at each attachment position on the panels for distributing load applied to the struts over a large area of the duct panels. Each strut is provided with a differential lead thread system which provides high resolution adjustment capability for the edge slot.
Claims3
A circulation control airfoil comprising,
- an upper duct panel and a lower duct panel spaced apart to form an edge slot, each said duct panel having a plurality of dimples therein,
- a plurality of saddles attached one each in each said dimple,
- a plurality of threaded fasteners positioned in each said saddle, and
- a plurality of struts each having a first threaded end of a first pitch threadedly attached to a fastener in said upper duct panel and each having a seconded threaded end of a pitch different from said first pitch threadedly attached to a fastener in said lower duct panel whereby the different thread pitches provide a high resolution adjustment for maintaining the edge slot height and whereby said saddles transfer the load of said struts over a large area of said duct panels.
A circulation control airfoil comprising,
- an upper duct panel and a lower duct panel spaced apart to form a trailing edge slot, each said duct panel having a plurality of spherical-shaped dimples therein,
- a plurality of spherical-shaped saddles bonded one each in each said spherical-shaped dimple,
- a plurality of threaded fasteners pivotally mounted in each said saddle, and
- a plurality of struts each having a first threaded end of a first pitch threadedly attached to a fastener in said upper duct panel and each having a seconded threaded end of a pitch different from said first pitch threadedly attached to a fastener in said lower duct panel whereby the different thread pitches provide a high resolution adjustment for maintaining the edge slot height and whereby said saddles transfer the load of said struts over a large area of said duct panels.
Dependencies are inferred from the claim text.