Research Papers

In-Bore Yaw Effects on Lateral Throw-off and Aerodynamic Jump Behavior for Small Caliber Projectiles Firing Sidewise From Air Vehicles

[+] Author and Article Information
Dimitrios N. Gkritzapis, Elias E. Panagiotopoulos

Department of Mathematical and Engineering Sciences, Hellenic Military Academy, Vari, Attiki, 16673, Greece; Laboratory of Firearms and Tool Marks Section,  Criminal Investigation Division, Hellenic Police, Athens, Attiki, 10442, Greece

J. Appl. Mech 78(5), 051017 (Aug 05, 2011) (7 pages) doi:10.1115/1.4004294 History: Received November 26, 2010; Revised May 24, 2011; Published August 05, 2011; Online August 05, 2011

The present study investigates the effects of in bore-yaw phenomenon on lateral throw-off and aerodynamic jump behavior for small caliber rotational symmetric (both in configuration and mass distribution) projectiles launched horizontally at supersonic firing speeds and various altitudes from high-subsonic air vehicles. The ammunition used is the caliber .50 API M8 bullet type firing from M2 machine automatic gun. The projectile is considered to be eccentrically engraved, tilted as it enters the rifling, and it is assumed that the tilt persists throughout its passage through the rifled barrel of the used weapon system. The modified linear 6-DOF flight simulation modeling is applied for the bullet free-flight trajectory predictions. The coupled epicyclic pitching and yawing motion analysis for the first 100 m of the examined trajectories are taken into account.

Copyright © 2011 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 1

Sketch of the caliber .50 API M8 projectile and Browning M2 machine gun

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Figure 2

No-roll (moving) and fixed (inertial) coordinate systems for the free-flight atmospheric trajectory of flat-firing projectiles from an aircraft

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Figure 3

Top view of the initial muzzle velocity at the firing point from browning M2 aircraft automatic gun

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Figure 4

Coupled pitching and yawing motion for the 12.7 mm bullet fired sidewise from an aircraft at three different departure angles 20 deg, 60 deg, 90 deg with 0.2 deg in-bore clearance

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Figure 5

Deflections produced by lateral throw-off and aerodynamic jump due to flat sidewise firing at different angles from an aircraft, with 0.2 deg, 0.3 deg and 0.4 deg in-bore clearance, at 100 m height

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Figure 6

Deflections produced by lateral throw-off and aerodynamic jump due to flat sidewise firing at 20 deg, 60 deg and 90 deg deg from the subsonic aircraft, with different in-bore clearance angles, at 100 m height




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