US4091731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection with flameholding
Assignee: United States Department of the Navy
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Filing: 1976-07-06
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Granted: 1978-05-30
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Expires: 1996-07-06
Abstract
Abstract A method and apparatus for improving combustion efficiency in external bung assisted projectiles by providing a stepped configuration of the projectile body and placing the injector ports in the recirculation zone created behind said step near the base of the projectile.
Inventors
- 👤 Klaus C. Schadow
- 👤 Don J. Chieze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:49
CPC Classifications
F; F42; F42B; F42B10/00; F42B10/32; F42B10/38; F42B10/40; Y; Y10; Y10S; Y10S60/00; Y10S60/917
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
135 words
A rocket assisted projectile comprising: a projectile body including an ogival nose portion and a bluff base; a solid propellant motor in said body including a primary combustion chamber; said combustion chamber communicating externally of said body through injector port means having at least one exit around the periphery of said body near said bluff base; said body having a substantially uniformly increasing circular cross section from the forward end of said nose portion to a point just forward of said injector port means; said body at said point being reduced sharply to present a step at a predetermined distance forward of said injector port means so that a recirculation zone is created behind said step and, when said motor is activated, the products of combustion from said chamber are injected into said recirculation zone.
Claim 2
Dependent Claim
135 words
A rocket assisted projectile comprising: a projectile body including an ogival nose portion and a bluff base; a solid propellant motor in said body including a primary combustion chamber; said combustion chamber communicating externally of said body through injector port means having at least one exit around the periphery of said body near said bluff base; said body having a substantially uniformly increasing circular cross section from the forward end of said nose portion to a point just forward of said injector port means; said body at said point being reduced sharply to present a step at a predetermined distance forward of said injector port means so that a recirculation zone is created behind said step and, when said motor is activated, the products of combustion from said chamber are injected into said recirculation zone.
Claim 3
Dependent Claim
22 words
A rocket assisted projectile according to claim 1 wherein said injector port means comprises a plurality of openings spaced around said body.
Claim 4
Dependent Claim
41 words
A rocket assisted projectile according to claim 2 wherein said injector point means is so arranged that the products of combustion are injected into the recirculation zone at an angle of about 45° to the longitudinal axis of the projectile body.
Claim 5
Dependent Claim
51 words
A rocket assisted projectile according to claim 2 further including primary nozzle means between said combustion chamber and said injector port means; said primary nozzle means in combination with said injector port means being effective to slow said products of combustion to subsonic speed before being injected into the recirculation zone.
Claim 6
Dependent Claim
41 words
A rocket assisted projectile accrding to claim 1 wherein said injector port means is so arranged that the products of combustion are injected into the recirculation zone at an angle of about 45° to the longitudinal axis of the projectile body.
Claim 7
Dependent Claim
49 words
A rocket assisted projectile according to claim 1 further including a primary nozzle between said combustion chamber and said injector means; said primary nozzle in combination with said injector port means being effective to slow said products of combustion to subsonic speed before being injected into the recirculation zone.
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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) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |