US4004514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roll rate stabilized wrap around missile fins
Assignee: United States Department of the Navy
•
Filing: 1976-01-20
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Granted: 1977-01-25
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Expires: 1996-01-20
Abstract
Abstract An air launched weapon having wrap-around fins wherein the fins are provi with fences, slots and roll tabs to stabilize the roll-rate at all angles of attack.
Inventors
- 👤 Peter Daniels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:05
CPC Classifications
F; F42; F42B; F42B10/00; F42B10/02; F42B10/14; F42B10/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
71 words
An air dropped weapon having a warhead, tail-mounted, wrap-around fins and means for stowing and deploying the fins wherein the improvement comprises: a fence mounted on the convex side of each fin adjacent the outer extremity thereof for balancing differential drag caused by the asymmetrical roll configuration; and a slot provided in each fin to cause each fin to change vortices at high angles of attack whereby roll-rate stabilization is obtained.
Claim 2
Dependent Claim
71 words
An air dropped weapon having a warhead, tail-mounted, wrap-around fins and means for stowing and deploying the fins wherein the improvement comprises: a fence mounted on the convex side of each fin adjacent the outer extremity thereof for balancing differential drag caused by the asymmetrical roll configuration; and a slot provided in each fin to cause each fin to change vortices at high angles of attack whereby roll-rate stabilization is obtained.
Claim 3
Dependent Claim
30 words
An air dropped weapon as defined in claim 1 wherein a roll tab is mounted on the aft end of each fin to produce stabilizing roll at a predetermined rate.
Claim 4
Dependent Claim
21 words
An air dropped weapon as defined in claim 1 wherein the ratio of slot area to fin area is approximately 0.3.
Claim 5
Dependent Claim
21 words
An air dropped weapon as defined in claim 2 wherein the ratio of slot area to fin area is approximately 0.3.
References Cited (Backward Citations)
US2793591A
Cited
FR1104534A
Cited
US3111088A
Cited
US3260205A
Cited
US3421714A
Cited
US3702588A
Cited
US3697019A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-25 | 1980-07-26 | 1981-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-25 | 1984-07-26 | 1985-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-25 | 1988-07-26 | 1989-01-25 | $7700.00 | Window Closed / Lapsed |