US4137008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable blowing slot for circulation control airfoil
Assignee: United States Department of the Navy
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Filing: 1977-09-21
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Granted: 1979-01-30
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Expires: 1997-09-21
Abstract
Abstract A circulation control airfoil having an edge slot formed by upper and loweruct 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.
Inventors
- 👤 James B. Grant
- 👤 George A. McCoubrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:32
CPC Classifications
B; B64; B64C; B64C3/00; B64C3/10; B64C3/14; B64C3/141
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
136 words
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.
Claim 2
Dependent Claim
136 words
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.
Claim 3
Dependent Claim
19 words
A circulation control airfoil as set forth in claim 1 wherein said saddles are adhesively bonded in said dimples.
Claim 4
Dependent Claim
141 words
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.
Claim 5
Dependent Claim
141 words
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.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |