US3890902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projectile
Assignee: United States Department of the Army
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Filing: 1973-12-04
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Granted: 1975-06-24
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Expires: 1993-12-04
Abstract
Abstract A projectile having a pair of longitudinally spaced rotating bands, one of which is forwardly adjacent the projectile center of gravity to provide a projectile bearing surface that minimizes projectile yaw within and at the exit of the gun barrel. An improved aerodynamic stability of the projectile at the gun muzzle exit is obtained, as well as increased projectile accuracy at the target.
Inventors
- 👤 Bruce W Travor
- 👤 Samuel L Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:08
CPC Classifications
F; F42; F42B; F42B14/00; F42B14/06; F42B14/064; F42B12/00; F42B12/02; F42B12/04; F42B12/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
140 words
In an aerodynamically stable projectile having a heavy penetrator positioned within a non-discarding sabot, said non-discarding sabot including a sabot body portion and an aerodynamic windshield nose member threadedly secured thereto, said heavy penetrator secured within said sabot body portion and said nose member, said nose member having a forward tapered external surface, said nose tapered surface terminating in a closed forward end, said sabot body portion having a forward exterior surface containing a cylindrical portion and a tapered portion forwardly thereof defining an origin of ogive therebetween, said tapered sabot portion being a mating continuation of said nose tapered surface, said sabot body portion carrying a first rotating band rearward of the center of gravity of said projectile, and a second rotating band having a mid-point located on said sabot body portion forward of said projectile center of gravity.
Claim 2
Dependent Claim
140 words
In an aerodynamically stable projectile having a heavy penetrator positioned within a non-discarding sabot, said non-discarding sabot including a sabot body portion and an aerodynamic windshield nose member threadedly secured thereto, said heavy penetrator secured within said sabot body portion and said nose member, said nose member having a forward tapered external surface, said nose tapered surface terminating in a closed forward end, said sabot body portion having a forward exterior surface containing a cylindrical portion and a tapered portion forwardly thereof defining an origin of ogive therebetween, said tapered sabot portion being a mating continuation of said nose tapered surface, said sabot body portion carrying a first rotating band rearward of the center of gravity of said projectile, and a second rotating band having a mid-point located on said sabot body portion forward of said projectile center of gravity.
Claim 3
Dependent Claim
29 words
The structure in accordance with claim 1 wherein the ratio of maximum surface diameters of said second and first rotating bands is in the range of 0.965 to 0.985.
Claim 4
Dependent Claim
10 words
The structure of claim 2 wherein said ratio is 0.975.
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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |