Abstract: A discriminating sensor for contact fuzing capable of discriminating between vibrations in flight and terminal impact includes one or more mass-spring systems constituting the moving portion of the sensor. Each mass-spring system is provided with controlled damping. The masses restrained by springs are displaced upon terminal impact to close an electric circuit. Each mass-spring system is provided with controlled damping so that the circuit will not be closed under frequently repeated perturbations or vibrations in flight. One form of damping is by one or more permanent magnets so placed that the magnetic force exerted on the moving mass opposes the motion in either direction.

Abstract: Disclosed is a spear having an elongated rod to penetrate hard targets. The spear is delivered either from the air or the ground and is accelerated by a rocket motor to achieve the required impact velocity, for penetration.