is obviously impractical the interaction time t during which the interception can occur i e the time during which the target and the intercepting projectile are side by side longitudinally is proportional to the sum of the lengths of the target l and the intercepting projectile l i while being inversely proportional to the sum of the corresponding two velocities v and v i i e in order to increase the probability of intercept i e interaction between the target and the intercepting projectile the interaction time t has to be maximized the only parameters that can be manipulated here are the velocity of the intercepting projectile v i which should be made as small as possible and the total length of the intercepting projectile l i which should be made as long as possible the length of the intercepting projectile cannot be made to be too long particularly since when using a propeller type of interceptor since the u201c thickness u201d longitudinal dimension of the propellers cannot be excessive an intercepting projectile with a slow linear velocity would however make the aforementioned interception distance l the distance away from the system or structure that is to be protected and at which the interception occurs too small it is therefore shown that the probability of intercept is maximized by using intercepting projectiles that have large cross sections a i and travel at relatively slow speeds however both prospects have serious drawbacks since they require that very large caliber projectiles to be fired at the target which is to be intercepted a very short distance from the vehicle or other.