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SMOOTHBORE GUN BARREL WITH ELECTROMAGNETICAL PROJECTILE SPIN

[Category : - OTHER]
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A gun barrel that consists of a frame tube (1) that encloses a barrel tube (2) that is used to induce rotation to a projectile. The gun barrel as a whole constitutes an electric motor such that the barrel tube (2) is a permanent magnet and acts as the rotor of said motor. The stator coils (3) of said motor are located outside the barrel tube (2) and are used to induce rotation to the rotor, i.e., the barrel tube (2).

In the traditional solution the angular velocity is induced by the spiral grooves (rifles) in the inner wall of the borehole of the gun barrel. The rifles cause additional friction between the projectile and the gun barrel, which increases the amount of energy needed to accelerate the projectile to the desired muzzle velocity. The angular velocity of the projectile is proportional to its forward velocity, which means that to achieve sufficient angular velocity the forward velocity, too, has to be large enough. Said angular velocity cannot be adjusted or chosen freely as it depends on the structure of the gun barrel and its rifles.

The basic idea of the invention is that the projectile of a gun, pistol, artillery gun, etc. is rotated before the release using a smoothbore barrel tube having an extremely large angular velocity. At the release the barrel tube and the projectile have identical angular velocities. Due to the absence of rifles in the barrel tube there is no excess friction between the projectile and the barrel tube in the forward direction. Thus, a larger forward velocity is obtained with less energy. The rotation of the barrel tube is achieved such that the gun barrel as a whole constitutes an electric motor. The middle part of the gun barrel is built as a permanent magnet that acts as the rotor of an electric motor having an extremely large angular velocity (e.g. 70,000 - 250,000 rounds per minute). The large rotational speed is reached for a short moment just prior to the release. After release, any backward or forward movement of the barrel tube is hindered by using a suspension mechanism that includes ball bearings.

Benefits Compared to the traditional method the desired muzzle velocity is achieved using a smaller amount of gunpowder, or a larger muzzle velocity using the same amount of gunpowder. Better accuracy and longer reach is thereby achieved for the projectile. The angular velocity of the projectile can be chosen arbitrarily depending on current needs. A large angular velocity will bring more stability and accuracy while a smaller angular velocity will allow the projectile to turn so as to be aligned with its ballistic path. By means of the present invention it is possible to achieve large angular velocities even with small forward velocities.

Patent publications:

WO 2015173462

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markohii (Finland)

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