Projectile, adapted to be given a rotation on firing, which makes the projectile spin-stabilized
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F42B-013/32
출원번호
US-0570423
(1984-01-13)
우선권정보
SE-7908002 (1979-09-27)
국제출원번호
PCT/SE80/00228
(1980-09-25)
§371/§102 date
[Act 371]19810514
([Act 101]19810514)
국제공개번호
WO81/00908
(1981-04-02)
발명자
/ 주소
Andersson, Kurt
Bartelsson, Nils
Bondesson, Stig
대리인 / 주소
Fleit, Jacobson, Cohn & Price
인용정보
피인용 횟수 :
20인용 특허 :
4
초록▼
A projectile adapted to be given a rotation on being fired which makes the projectile spin-stabilized. With the object of facilitating the terminal guidance of the projectile or increasing the effect of an explosive charge with a hollow-charge effect carried by the projectile, the projectile is prov
A projectile adapted to be given a rotation on being fired which makes the projectile spin-stabilized. With the object of facilitating the terminal guidance of the projectile or increasing the effect of an explosive charge with a hollow-charge effect carried by the projectile, the projectile is provided with stabilizing fins (6-9) which are extended at a desired point in the trajectory of the projectile and brake the rotation of the projectile. The projectile is so dimensioned that its center of pressure (C2) is situated behind the center of gravity (G) of the projectile in the extended position of the fins (FIG. 2) and so that the center of pressure (C1) lies in front of the center of gravity of the projectile in the retracted position of the fins (FIG. 1), so that, with braked rotation, the projectile changes over from being spin-stabilized to being fin-stabilized. The fins (6-9), which can consist of so-called wrap-around fins, are held in the retracted position, in an embodiment shown, by covering plates (2-5) which are held in place by a so-called base bleed unit (1). A delay device is adapted to be separated from the projectile at the desired point in the trajectory, so that the covering plates (2-5) are removed and expose the fins (6-9), as a result of which these can be extended.
대표청구항▼
1. A guided projectile system for firing a projectile from a barrel and guiding the projectile through its trajectory, said guided projectile system comprising: rotating means for firing said projectile from said barrel and for rotating said projectile at a spin rate in the range of 300-2000 rad/
1. A guided projectile system for firing a projectile from a barrel and guiding the projectile through its trajectory, said guided projectile system comprising: rotating means for firing said projectile from said barrel and for rotating said projectile at a spin rate in the range of 300-2000 rad/sec to enable said projectile to be in a stabilized state in its trajectory solely by rotating motion, said projectile travelling at least half of its trajectory outside the barrel in said stabilized state; said projectile including stabilizing fins located in a retracted position during said stabilized state and being extendable to an extended position at a desired point in the trajectory of said projectile to thereby brake rotation of said projectile; said projectile having an aerodynamic center of pressure located in front of the center of gravity of said projectile when said stabilizing fins are in said retracted position, and the aerodynamic center of pressure of said projectile being moved, when said stabilizing fins are in said extended position, to be located behind the center of gravity of said projectile for stabilization of said projectile; and said projectile, upon extension of said stabilizing fins to said extended position for braked rotation of said projectile, changing over from being stabilized solely by rotating motion to being fin-stabilized by said stabilizing fins shifting said aerodynamic center of pressure to be located behind the center of gravity and said projectile. 2. A guided projectile system as claimed in claim 1, further comprising locking means for holding said stabilizing fins in said retracted position, said locking means being separable from said projectile to expose said stabilizing fins at said desired point in the trajectory. 3. A guided projectile system as claimed in claim 1, wherein said stabilizing fins are formed as wrap-around fins. 4. A guided projectile system as claimed in claim 2, wherein said stabilizing fins are formed as wrap-around fins. 5. A projectile comprising: a projectile body being rotatable in the range of 300-2000 rad/sec during at least half of its trajectory for stabilization of said projectile body solely by rotation; stabilizing fins located in a retracted position on said projectile body during said at least half of the projectile body's trajectory and said stabilizing fins moving to an extended position at a desired point in the trajectory of said projectile body to brake rotation of said projectile; and an aerodynamic center of pressure of said projectile body being located in front of the center of gravity of said projectile body during said at least half of the projectile body's trajectory and said aerodynamic center of pressure being moved behind said center of gravity for stabilization of said projectile upon extension of said stabilizing fins to said extended position and for changing stabilization of said projectile body from stabilization solely by rotation to stabilization by said stabilizing fins. 6. A projectile as claimed in claim 5, further comprising locking means for holding said stabilizing fins in said retracted position, said locking means being separable from said projectile to expose said stabilizing fins at said desired point in the trajectory. 7. A projectile as claimed in claim 6, wherein said stabilizing fins are formed as wrap-around fins. 8. A projectile as claimed in claim 5, further comprising a base bleed unit mounted at the base end of the projectile body.
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이 특허에 인용된 특허 (4)
Humphries Waymon (Laurel MD) Nahas Joseph A. (Laurel MD), Expanding stabilizing fin cup.
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