Abstract: A sonobuoy suspension system is disclosed wherein a spring motor having a substantially constant output torque is mounted within an upper sonobouy unit secured to a buoyant flotation member. Formed from a coiled band, constant force extension spring wound in opposite directions about a pair of rotatable drums so that the spring is extended tangentially therebetween, the motor is coupled to a lower sensor unit by a non-compliant suspension cable for supporting the sensor unit at a predetermined underwater depth substantially isolated from the wave affecting the upper unit and flotation member.

Abstract: A low cost sonobuoy is constructed of plastic pipe and fittings. A simple design is used comprising a section of plastic pipe and two end caps. One end cap is tapered and adapted for having an antenna mounted thereon. The other end cap has a recess for storing a hydrophone, cable and plastic streamers. The hydrophone and cable are held in place by water soluble tape. The sonobuoy may be launched from aircraft and thus the plastic streamers trail from the second end cap to provide in-air stability. The sonobuoy is designed to be self-righting and self-scuttling.