Abstract:
Darts is a famous throwing sport in which small missiles or arrows are thrown at a circular dartboard fixed to a wall. A conventional dart comprises a point, a barrel, a shaft and a flight. A disadvantage of the conventional dart is that the dart frequently wobbles while completing a trajectory between a hand releasing the dart and a board acting as target. The current invention provides a flight for a tail assembly of a throwing dart describing a trajectory after release, wherein the tail assembly comprises an elongated flight holder, comprising: - connecting means for connecting the flight to the elongated flight holder; - an inflatable inner space; and - a deformable surface arranged to the inflatable inner space such that when the inflatable inner space is inflated the deformable surface is shaped for continuously generating drag while the throwing dart describes the trajectory.
Abstract:
An air vehicle (10), such as a munition like a guided bomb or missile, has a control system (12) that allows control surfaces (14, 20, 22) to be mechanically uncoupled from one or more actuators (46, 48) to allow the control surfaces to freely move (rotate) relative to a fuselage (16) of the vehicle (10), for example allowing the control surfaces to "weather vane" by assuming an orientation corresponding to the direction of airflow past the air vehicle (direction of airflow relative to the air vehicle). When active positioning of the control surfaces is desired, the control surfaces may be mechanically coupled to one or more actuators that are used to position the control surfaces. The selective coupling of the actuator(s) and the control surfaces may be accomplished by selectively coupling together a sleeve (36, 38) that is mechanically coupled to the control surfaces, and a nut (62) that moves along a shaft (32, 34) of an actuator, for example using a resilient device (64, 114, 118).
Abstract:
An airfoil is disclosed. The airfoil may comprise a leading edge, a body portion and a trailing edge formed from a high-modulus plating. The body portion of the airfoil may be formed from a material having a lower elastic modulus than the high-modulus plating. The high-modulus plating may improve the stiffness of the trailing edge, allowing for thinner trailing edges with improved fatigue life to be formed.
Abstract:
According to the invention, the balance weights of the missile are made from pellets (15) whereof the particle size is at most equal to 1mm and which is enclosed in a closed package (16).
Abstract:
A multi-caliber fuze kit includes a fuze housing configured for coupling with multiple projectiles. One or more canards are moveably coupled with the fuze housing. The one or more canards are adjustable between two or more canard configurations. In a first canard configuration, the one or more canards are at a first canard angle relative to a bore sight of the fuze housing, and the first canard angle is configured for use with a first projectile. In a second canard configuration, the one or more canards are at a second canard angle relative to the bore sight of the fuze housing, and the second canard angle is configured for use with a second projectile. The first and second canard angles are different. In another example, in the first canard configuration the one or more canards include a first canard shape configured to provide a first specified trajectory with the first projectile. In the second canard configuration the one or more canards include a second canard shape configured to provide a second specified trajectory with the second projectile. The first canard shape and the second canard shape are different.
Abstract:
A projectile (50) is propelled from a location in air, through anair/water interface, and toward an underwater object (24). The projectile (50) is of a full caliber that is directly received into and fired from a gun barrel (22). The portion of the projectile (50) that contacts the bore of the gun (22) is made of a material that will not unduly damage or be transferred to the bore of the gun upon firing. The projectile (50) includes a forward end stinger head (74) that forms a cavitation void (30) around the projectile (50) in water, minimizing water drag on the remainder of the projectile (50). The projectile (50) further includes a shoulder (90) that contacts the side of the cavitation void (30) in the event that the projectile (50) yaws into a wall of the cavitation void (30) as it passes through water, producing a restoring force that prevents the projectile (50) from tumbling.
Abstract:
Um die Abschussfestigkeit eines Vollkaliber-Übungsgeschosses (1), welches ein massives Kopfteil (3) und einen sich heckseitig an das Kopfteil (3) anschließenden rohrförmigen Leitwerkskörper (5) umfasst, auf kostengünstige Weise sicherzustellen, schlägt die Erfindung vor, den Leitwerkskörper (5) derart auszugestalten, dass die beim Abschuss des Übungsgeschosses (1) entstehenden Treibladungsgase auch auf die Außenseite (6) der Seitenwand (7) des rohrförmigen Leitwerkskörpers (5) wirken. Zur Vermeidung eines außenseitigen Vorbeiströmens der Treibladungsgase an dem Übungsgeschoss (1) innerhalb des Waffenrohres ist ein Dichtungssystem (10) im Bereich des massiven Kopfteiles (3) des Übungsgeschosses (1) vorgesehen, welches einen von einem Keilring (12) beaufschlagten Dichtungsring (11) umfasst. Sowohl der axial verschiebbare Keilring (12) als auch der Dichtungsring (11) sind dabei in einer im heckseitigen Bereich des Kopfteiles (3) befindlichen Ringnut (13) angeordnet. Dabei weist der in Schussrichtung des Übungsgeschosses (1) vor dem Keilring (12) angeordnete Dichtungsring (11) einen hinteren kegelförmigen Innenhohlraum (14) auf, in den der vordere Bereich des Keilringes (12) kraft- und formschlüssig eingreift, derart, dass bei einer axialen Druckbeaufschlagung des Keilringes (12) dieser axial verschoben wird und den als Dichtlippe wirkenden äußeren Seitenwandbereich (15) des kegelförmigen Innenhohlraumes (14) des Dichtungsringes (11) radial gegen die Innenwand des Waffenrohres drückt.
Abstract:
Um die Abschussfestigkeit eines Vollkaliber-Übungsgeschosses (1), welches ein massives Kopfteil (3) und einen sich heckseitig an das Kopfteil (3) anschließenden rohrförmigen Leitwerkskörper (5) umfasst, auf kostengünstige Weise sicherzustellen, schlägt die Erfindung vor, den Leitwerkskörper (5) derart auszugestalten, dass die beim Abschuss des Übungsgeschosses (1) entstehenden Treibladungsgase auch auf die Außenseite (6) der Seitenwand (7) des rohrförmigen Leitwerkskörpers (5) wirken. Zur Vermeidung eines außenseitigen Vorbeiströmens der Treibladungsgase an dem Übungsgeschoss (1) innerhalb des Waffenrohres ist ein Dichtungssystem (8) im Bereich des massiven Kopfteiles (3) des Übungsgeschosses (1) vorgesehen, wobei auf der Außenseite (9) des Kopfteiles (3) ein als Dichtungsfläche ausgebildeter umlaufender Bereich (10) vorgesehen ist, dessen Außendurchmesser derart gewählt ist, dass das Kopfteil (3) beim Abschuss des Übungsgeschosses (1) in diesem Bereich (10) selbst das Dichtungssystem (8) bildet. Vorzugsweise befindet sich in der Dichtungsfläche (10) eine Rillendichtung, die mindestens drei axial von einander beabstandete, ringförmig angeordnete Rillen (11) umfasst.
Abstract:
A projectile includes a cartridge and a hollow bullet. A propellant fills the cartridge and the hollow bullet to increase the velocity of the bullet when fired. The hollow bullet has a flattened leading end and an annular ring is secured to the flattened leading end in the center of the flat region. The flattened leading end and the annular ring move a center of pressure forwardly so that a center of pressure is forward of a center of gravity of the bullet when the bullet is in flight. In a second embodiment, a plurality of circumferentially spaced apart slits is formed in a trailing end of the hollow bullet, creating a plurality of circumferentially spaced apart fins that flare radially outwardly upon impact with a soft target.
Abstract:
A vibration controlled housing. The novel housing includes a housing structure and a mechanism for receiving a control signal and in accordance therewith electronically tuning a structural response of the structure. In an illustrative embodiment, the housing structure includes a composite material containing a plurality of piezoelectric fibers adapted to generate an electrical signal in response to a deformation in the structure and to deform the structure in response to an electrical signal applied thereto. A control circuit receives the sensed signal from the fibers and generates an excitation signal that is applied to the fibers to increase the stiffness or compliance of the fibers at predetermined frequencies. In an illustrative embodiment, the control signal is adapted to provide low frequency stiffness and strength performance while attenuating high frequency vibrations to protect electronics housed within the structure.