US3873233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double slotted circulation control airfoil
Assignee: United States Department of the Navy
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Filing: 1974-02-19
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Granted: 1975-03-25
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Expires: 1994-02-19
Abstract
Abstract A circulation control airfoil includes at least two slot blades supported by a rib structure positioned in the airfoil trailing or leading edge. The rib structure is attached to a main spar, to the airfoil trailing edge (or leading edge) and to the slot blades thereby maintaining the blowing jet slot heights and the geometric integrity of the trailing (or leading) edge of the airfoil.
Inventors
- 👤 Drew W Linck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:32
CPC Classifications
B; B64; B64C; B64C3/00; B64C3/10; B64C3/14; B64C3/141
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
108 words
A multislotted circulation control airfoil comprising: a main spar for supporting the multislotted circulation control airfoil; a first slot blade attached substantially immovably to said main spar; a support rib attached to said main spar; a second slot blade attached substantially immovably to said support rib; a sliding support rib attached to said first slot blade and positioned within a groove in said main spar and a groove in said second slot blade; a blunt trailing edge including a coanda surface said first slot blade and said second blade forming a first blowing slot; and said second slot blade and said trailing edge forming a second blowing slot.
Claim 2
Dependent Claim
108 words
A multislotted circulation control airfoil comprising: a main spar for supporting the multislotted circulation control airfoil; a first slot blade attached substantially immovably to said main spar; a support rib attached to said main spar; a second slot blade attached substantially immovably to said support rib; a sliding support rib attached to said first slot blade and positioned within a groove in said main spar and a groove in said second slot blade; a blunt trailing edge including a coanda surface said first slot blade and said second blade forming a first blowing slot; and said second slot blade and said trailing edge forming a second blowing slot.
Claim 3
Dependent Claim
22 words
The circulation control airfoil of claim 1 further including first adjustment means for adjusting the slot height of said second blowing slot.
Claim 4
Dependent Claim
22 words
The circulation control airfoil of claim 2 further including second adjustment means for adjusting the slot height of said first blowing slot.
Claim 5
Dependent Claim
30 words
The circulation control airfoil of claim 2 further including adjustment means for adjusting the position of said sliding support rib and thereby the slot height of said first blowing slot.
References Cited (Backward Citations)
US2135887A
Cited
US2406917A
Cited
US2617487A
Cited
US2885160A
Cited
US3525577A
Cited
US3554664A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |