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Shock and Vibration
Volume 8, Issue 3-4, Pages 239-251
http://dx.doi.org/10.1155/2001/362815

Aerodynamic Jump: A Short Range View for Long Rod Projectiles

Mark Bundy

US Army Research Laboratory, AMSRL-WM-BC, Aberdeen Proving Ground, MD 21005-5066, USA

Received 15 October 2001; Revised 15 October 2001

Copyright © 2001 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

It is shown that aerodynamic jump for a nonspinning kinetic energy penetrator is not – as conventional definitions may infer – a discontinuous change in the direction of motion at the origin of free flight, nor is it the converse, a cumulative redirection over a domain of infinite extent. Rather, with the aid of an alternative kinematical definition, it is shown that aerodynamic jump for such a projectile is a localized redirection of the center-of-gravity motion, caused by the force of lift due to yaw over the relatively short region from entry into free flight until the yaw reaches its first maximum. A rigorous proof of this statement is provided, but the primary objective of this paper is to provide answers to the questions: what is aerodynamic jump, what does it mean, and what aspects of the flight trajectory does it refer to, or account for.