Accession Number : ADA303096

Title :   Directed Energy Effects on the Flight Path of a Spinning Ballistic Projectile.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Capen, George S.

PDF Url : ADA303096

Report Date : JUN 1995

Pagination or Media Count : 95

Abstract : This thesis will examine the equations of motion for a spinning ballistic projectile. The goal of such an examination is to determine the possible mechanisms by which a directed energy weapon may induce sufficient instability as to significantly alter the projectile's flight path. A ballistic projectile is generally launched with a "fire and forget" philosophy. The desired impact point is determined before firing. It may be possible to alter the projectile in such a way that it fails to follow the desired trajectory thereby missing the intended target. Several variables appear to be worthy of investigation to assess their contribution to a required instability or range reduction. Skin friction drag may be increased from surface roughness generated by a pulsed energy source. The results that this thesis will examine include: impulse generated by the laser interaction, additional Magnus effects and aerodynamic drag. Moment induced instability may also result from these in the form of a Magnus moment or drag torque. Increasing the drag force appears to be the most promising theoretical solution to defeating an incoming spinning ballistic projectile.

Descriptors :   *DIRECTED ENERGY WEAPONS, *BALLISTIC TRAJECTORIES, *LASER TARGET INTERACTIONS, YAW, EQUATIONS OF MOTION, INTERACTIONS, PROJECTILES, SURFACE ROUGHNESS, THESES, MOMENTS, REDUCTION, LIGHT PULSES, AERODYNAMIC DRAG, SPINNING(MOTION), FLIGHT PATHS, BALLISTICS, PROJECTILE TRAJECTORIES, INSTABILITY, TORQUE, SKIN FRICTION, IMPACT POINT, MAGNUS EFFECT.

Subject Categories : Ballistics
      Directed Energy Weapons

Distribution Statement : APPROVED FOR PUBLIC RELEASE