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Title:
BULLET HAVING GAS CURVED PATHS OF BOAT TAIL FOR EQUALLY DISCHARGING COMPRESSED GAS
Document Type and Number:
WIPO Patent Application WO/2018/230807
Kind Code:
A1
Abstract:
The present invention relates to a bullet having flight stability capable of maintaining trajectory from when the bullet leaves from the muzzle of a gun, by guiding the emission of compressed gas toward three or more gas curved paths earlier than a boat tail, increasing initial acceleration in a predetermined range, by using the compressed gas so as to push the bullet further and emitting the gas while surrounding the outer surface of the bullet, improving accuracy and destructive power according to the stabilization of the flight, and also increasing an effective range. An angle of a boat tail of a conventional bullet and the length thereof at a point at which the rear surface of a middle end of the bullet starts are formed in order to reduce a rear vortex influencing the bullet as a warhead proceeds during flight, but it is difficult to exhibit an effect since the angle capable of forming a natural flow of air is not formed. In order to improve the problem above, a start end, at which three or more gas curved paths for guiding fluid to a fin end of the bullet start, is formed to be longer than a start end, at which the boat tail starts to be formed, by a predetermined length so as to equally discharge the compressed gas to the outer surface of the front of the bullet before the start end of the boat tail comes out of a cross section of the muzzle of the gun (cannon). A length from the start end, at which the boat tail starts, to a base bottom is formed to be greater than or equal to 1/4 of a bullet full length (L), and a length from the start end, at which the gas curved path starts, to the base bottom is formed to be greater than or equal to 1/3.5 of the bullet full length (L). The bullet of the present invention greatly increases the effective range since the acceleration of the bullet is increased in a predetermined range by the flight stabilization of an initial trajectory and the gas curved paths, and increases the destructive power since the bullet hits a target more accurately (accuracy improvement) and the overturning of the bullet is reduced. In addition, compared to the prior art for improving bullet performance by increasing mass (weight) of the conventional bullet, the present invention can manufacture the bullet, which has accuracy and does not finally overturn only with a small amount of mass, flies, by using propellant gas regardless of the pitch angle of rifling grooves so as to stabilize the trajectory in an early stage, and obtains an effect of increasing acceleration in the predetermined range, so as to extend the effective range and have excellent performance in destructive power.

Inventors:
KIM, Junkyu (805-301, 3 Baeul2-ro,,Yuseong-gu, Daejeon, 34021, KR)
KIM, Hyungse (805-301, 3 Baeul2-ro,,Yuseong-gu, Daejeon, 34021, KR)
Application Number:
KR2018/001556
Publication Date:
December 20, 2018
Filing Date:
February 06, 2018
Export Citation:
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Assignee:
DURETEK INC (Room711, Foundation of University-Industry Research Collaboration 99 Daehak-ro,,Yuseong-gu, Daejeon, 34134, KR)
International Classes:
F42B10/44; F15D1/00; F42B10/26
Foreign References:
KR101021055B12011-03-14
US7934455B22011-05-03
KR101713529B12017-03-08
US4063511A1977-12-20
KR101660887B12016-09-28
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