US4108403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vortex reducing wing tip
Assignee: Individual
•
Filing: 1977-08-05
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Granted: 1978-08-22
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Expires: 1997-08-05
Abstract
Abstract An airfoil tip is constructed to droop downward and extend aft of the trailing edge of the air foil structure and to include air foil configuration both chordwise and spanwise with camber in both the chordwise and spanwise directions and further including a vortex opposing twist in the chordwise direction.
Inventors
- 👤 Reginald Vernon Finch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:10
CPC Classifications
B; B64; B64C; B64C23/00; B64C23/06; B64C23/065; B64C23/069; Y; Y02; Y02T; Y02T50/00; Y02T50/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
154 words
A counter vortex airfoil tip for countering the vortex created by relative movement between the airfoil and a body of air, said tip comprising: an inboard end for mounting on the outer end of an airfoil, the inboard end having a configuration substantially conforming to the profile of the airfoil to which said tip is mounted, said airfoil tip defined by upper and lower surfaces extending outward and curving downward and extending aft at the outboard end thereof to a trailing tip extending approximately one half the length of the inboard end behind the trailing edge of the inboard end, said upper and lower surfaces joined at a leading edge that extends outward and curves downward to a lower edge that extends below the lower surface of said inboard end from the leading edge thereof to the trailing tip, and said airfoil tip having an airfoil configuration in both its chordwise and spanwise direction.
Claim 2
Dependent Claim
154 words
A counter vortex airfoil tip for countering the vortex created by relative movement between the airfoil and a body of air, said tip comprising: an inboard end for mounting on the outer end of an airfoil, the inboard end having a configuration substantially conforming to the profile of the airfoil to which said tip is mounted, said airfoil tip defined by upper and lower surfaces extending outward and curving downward and extending aft at the outboard end thereof to a trailing tip extending approximately one half the length of the inboard end behind the trailing edge of the inboard end, said upper and lower surfaces joined at a leading edge that extends outward and curves downward to a lower edge that extends below the lower surface of said inboard end from the leading edge thereof to the trailing tip, and said airfoil tip having an airfoil configuration in both its chordwise and spanwise direction.
Claim 3
Dependent Claim
15 words
The airfoil tip of claim 1, wherein said tip has a vortex opposing twist therein.
Claim 4
Dependent Claim
19 words
The airfoil tip of claim 2, wherein said twist is defined by the lower surface of said airfoil tip.
Claim 5
Dependent Claim
34 words
The airfoil tip of claim 1, wherein said lower edge extends below the lower surface of said inboard end at the thickest portion of said end at least the thickness of said end thereat.
Claim 6
Dependent Claim
21 words
The airfoil tip of claim 1, wherein said trailing tip is displaced inward from the outboard end of said airfoil tip.
Claim 7
Dependent Claim
15 words
The airfoil tip of claim 5, wherein said airfoil tip converges toward said trailing tip.
Claim 8
Dependent Claim
28 words
The airfoil tip of claim 6, wherein said trailing tip is below the lower surface of said airfoil when said airfoil is at a zero angle of attack.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-21 | 1982-02-20 | 1982-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-21 | 1986-02-20 | 1986-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-21 | 1990-02-20 | 1990-08-22 | $7700.00 | Window Closed / Lapsed |