Abstract: A projectile base plug with enhanced separation capability has a body which fits into an end of a spinning projectile casing and drag-producing vanes being spaced apart about the circumference of the object and pivotally mounted thereto for movement between stowed and deployed positions. Upon ejection of the base plug from the projectile casing, the vanes are released from stowed positions within the aerodynamic outline of the base plug where they have no substantial effect on the flight of the projectile, to deployed positions by centrifugal force generated by the spinning body where they project into the air stream and produce drag on the ejected base plug.

Abstract: In combination: a frame; an outer gimbal mounted in the frame for pivotal movement about a first axis; an inner gimbal mounted in the outer gimbal for pivotal movement about a second axis orthogonal to the first axis; a sensor having a longitudinal axis; apparatus mounting said sensor in the inner gimbal with the longitudinal axis orthogonal to said second axis; apparatus carried by the frame for causing rotation of the outer gimbal about the first axis; and apparatus carried in part by said frame and in part by said inner gimbal for causing rotation of the inner gimbal about the second axis.

Abstract: An oscillatory driving mechanism for use with a scanning transducer includes a configured magnet structure having an associated torque coil cooperating therewith. The torque coil is mounted on a pivoting armature which, in turn, carries the scanning transducer through the predetermined arcuate path. A split pole piece magnetic structure is also positioned adjacent the armature. The armature carries a permanent magnet into an adjustable position relative to the split pole piece members. Hall plate sensors are positioned with respect to the pole piece members to detect the position of the armature at any instant.