Document: 990-0000046-1000
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4200 TOWFISH
The 4200 towfish is a hydro-dynamically stable towed body, which contains the transducers
and electronics necessary to generate and receive the side scan sonar signals, and
communicate with the topside unit. It is a compact stainless steel cylinder equipped with
stabilizing fins and lead nose weight for hydrodynamic balance. One person can handle it, but
it is recommended that 2 persons team up to carry the towfish.
Identical but separate, port and starboard transducers are mounted along the side of the
towfish. The whole length of the towfish is a watertight pressure vessel, housing the
electronics. The front and rear end caps are secured to the housing, and waterproofed using
double bore O ring seals. A guide pin is provided to ensure proper alignment.
The electronics chassis is connected to the rear end cap through a Delrin insulating plate.
The towfish was designed to only require a single tool for maintenance. A 4mm Allen key is
used to secure the arrays, the tail cone and accessing the electronics.
All connections to the arrays are terminated at the rear (aft) end cap.
The end caps are retained in the pressure housing by using nylon line in a shared end cap/tube
retention groove, minimizing the need for fine securing screws in the external assembly.
