Patent US3778009A successfully refreshed from Google Patents.
US3778009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aerodynamic surfaces
Assignee: BAE Systems PLC
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Filing: 1971-06-23
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Granted: 1973-12-11
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Expires: 1991-06-23
Abstract
Abstract A high lift device at the trailing edge of an aircraft wing, consisting of members that can be extended or inflated to produce a bluff thickened trailing edge of generally semicylindrical profile. Air is blown over this semi-cylindrical profile from one or more naturally or forcibly blown slots to achieve boundary layer control.
Inventors
- 👤 P Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:13
CPC Classifications
B; B64; B64C; B64C9/00; B64C9/14; B64C9/16; B64C9/20; B64C23/00; B64C23/005
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
190 words
An aircraft wing, having a main body and a trailing portion, with a recess in the underside of said trailing portion, a high lift device comprising a plurality of interconnected members stowed in a folded condition in said recess when the device is not in use, and means for unfolding and extending said interconnected members into an operative condition below said recess thereby to form on the trailing portion of the wing an under and rear surface which is made up of a convexly curved approximately semi-cylindrical bluff rear part extending downward from the region of the wing trailing edge to a position well below the level of the undersurface of the main body of the wing, and a substantially flat under part, connected at its rear edge to said convexly curved bluff rear part of said position well below the main body surface level, and extending therefrom forward and upward to a region adjacent the forward extremity of said recess, at least one slot being defined in the region of the upper extremity of said convexly curved bluff part to issue air rearwardly over said convexly curved bluff part.
Claim 2
Dependent Claim
190 words
An aircraft wing, having a main body and a trailing portion, with a recess in the underside of said trailing portion, a high lift device comprising a plurality of interconnected members stowed in a folded condition in said recess when the device is not in use, and means for unfolding and extending said interconnected members into an operative condition below said recess thereby to form on the trailing portion of the wing an under and rear surface which is made up of a convexly curved approximately semi-cylindrical bluff rear part extending downward from the region of the wing trailing edge to a position well below the level of the undersurface of the main body of the wing, and a substantially flat under part, connected at its rear edge to said convexly curved bluff rear part of said position well below the main body surface level, and extending therefrom forward and upward to a region adjacent the forward extremity of said recess, at least one slot being defined in the region of the upper extremity of said convexly curved bluff part to issue air rearwardly over said convexly curved bluff part.
Claim 3
Dependent Claim
17 words
A wing according to claim 1, wherein forced blowing is provided through said at least one slot.
Claim 4
Dependent Claim
24 words
A wing according to claim 1, wherein natural blowing of air from the lower wing surface is provided through said at least one slot.
Claim 5
Dependent Claim
16 words
A wing according to claim 1, wherein the high lift device comprises an inflatable flexible bag.
Claim 6
Dependent Claim
17 words
A wing according to claim 4, wherein the material of the bag is stretchable circumferentially upon inflation.
Claim 7
Dependent Claim
35 words
A wing according to claim 4, wherein, in the operative condition of the device, forced blowing takes place through said slot which slot is formed in the upper part of the circumference of the bag.
Claim 8
Dependent Claim
19 words
A wing according to claim 1, wherein the high lift device comprises movable rigid segments hinged to one another.
Claim 9
Dependent Claim
40 words
A wing according to claim 7, wherein, in the operative condition of the device, natural blowing takes place through said slot which slot is formed between one of said rigid segments, and a fixed trailing edge portion of the wing.
Claim 10
Dependent Claim
88 words
A wing according to claim 7, wherein the high lift device comprises a generally flat lower plate that substantially closes off the recess when the device is stowed but drops below the wing main body, when the device is extended, into a disposition in which it slopes down in the rearward direction to form said substantially flat surface part and creates a scoop-type gap between its leading edge and the bottom of an adjacent main body region of the wing to gather air for naturally blowing said slot.
Claim 11
Dependent Claim
22 words
A wing according to claim 9, wherein the segments and the plate are hinged together to form a substantially continuous articulated surface.
Claim 12
Dependent Claim
40 words
A wing according to claim 10, wherein during extension and retraction the segments are carried rearward and forward on a trolley running along a fore-and-aft curved track that is fixed to the trailing portion of the wing above the recess.
References Cited (Backward Citations)
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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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |