Regional Nature of Aerodynamic Jump

It is shown that aerodynamic jump for a nonspinning kinetic energy penetrator is neither a point change in direction, nor a curving change that takes place over a domain of infinite extent, as conventional definitions may infer. Rather, with the aid of an alternate 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 report 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?Army Research Lab Aberdeen Proving Ground is the author of 'Regional Nature of Aerodynamic Jump', published 1999 under ISBN 9781423554141 and ISBN 1423554140.