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.

Issue Section:
Research Papers
Keywords:
aerospace simulation, aircraft, projectiles, weapons, in-bore yaw effects, lateral throw-off behavior, aerodynamic jump analysis, 12.7mm API M8 bullet type, modified linear 6-DOF trajectory simulation, supersonic firing, high-subsonic air vehicles, tilt angle
Topics:
American Petroleum Institute, Bullets, Firing, Flight, Projectiles, Trajectories (Physics), Vehicles, Yaw, Simulation, Aircraft, Deflection, Spin (Aerodynamics)

References

1.
Bundy
,
M.
, 1999, “
The Regional Nature of Aerodynamic Jump
,” Ballistic Research Laboratories Report No. 1872.
2.
Sterne
,
T. H.
, 1944, “
On Jump Due to Bore Clearance
,” Ballistic Research Laboratories Report No. 491.
3.
Cooper
,
G.
, 2004, “
Extending the Jump Analysis for Aerodynamic Asymmetry
,” Army Research Laboratory, Paper No. ARL-TR–3265.
4.
Cooper
,
G.
, 2003, “
Projectile Aerodynamic Jump Due to Lateral Impulsives
,” Army Research Laboratory, Paper No. ARL-TR–3087.
5.
Gkritzapis
D. N.
,
Panagiotopoulos
,
E. E.
,
Margaris
,
D. P.
, and
Papanikas
,
D. G.
, 2007,
“Computational Atmospheric Trajectory Simulation Analysis of Spin-Stabilized Projectiles and Small Bullets
,”
Atmospheric Flight Mechanics Conference and Exhibit
,
Hilton Head, SC
, August 20–23, AIAA Paper No. 2007–6584.
6.
Hainz
,
L.
 and
Costello
,
M.
, 2005, “
Modified Projectile Linear Theory for Rapid Trajectory Prediction
,”
J. Guid. Control Dyn.
28
(
5
), pp.
1007
–
1009
.
7.
Costello
,
M.
 and
Peterson
,
A.
, 2000, “
Linear Theory of a Dual-Spin Projectile in Atmospheric Flight
,”
J. Guid. Control, Dyn.
23
(
5
)
8.
Murphy
,
C. H.
, 1961, “
Circular Pitching and Yawing Motion of Nose Cone Configurations
,”
Planetary and Space Science
,
4
, pp.
328
–
336
.
Crossref
Search ADS
 
9.
Rasmussen
,
M. L.
 and
Kirk
,
D. B.
, 1964, “
On the Pitching and Yawing Motion of a Spinning Symmetric Missile Governed by an Arbitrary Nonlinear Restoring Moment
,” Paper No. NASA TN D–2135.
10.
Burchett
,
B.
,
Peterson
,
A.
, and
Costello
,
M.
, 2002, “
Prediction of Swerving Motion of a Dual-Spin Projectile With Lateral Pulse Jets in Atmospheric Flight
,”
Math. Comput. Modell.
35
(
1/2
), pp.
1
–
14
.
11.
McCoy
,
R. L.
, 1999,
Modern Exterior Ballistics
,
Schiffer
,
Attlen, PA
.
12.
Etkin
,
B.
, 1972,
Dynamics of Atmospheric Flight
,
Wiley
,
New York
.
13.
Amoruso
,
M. J.
, 1996, “
Euler Angles and Quaternions in Six Degree of Freedom Simulations of Projectiles
,” Technical Note.
14.
McCoy
,
R. L.
, 1982, “
Aerodynamic Characteristics of the 30mm XM788 and XM789 Projectiles
,” Ballistic Research Laboratories Report No. 2432.
15.
Gkritzapis
,
D. N.
,
Panagiotopoulos
,
E. E.
,
Margaris
,
D. P.
, and
Papanikas
,
D. G.
, 2008, “
Flat-Fire Aerodynamic Jump Performance of Projectiles Fired From a Helicopter
,”
Journal of Battlefield Technology, Firepower and Protection
,
11
(
2
), pp.
1
–
8
.
Copyright © 2011
 by American Society of Mechanical Engineers
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