E-3 



DEEP TOW 



Operating Depth : 6,096m (20,000 ft) 



Uimensions (lxwxH) : 2m x O.T5ni x 0.5ni (6.6 ft x 2.5 ft x 1.6 ft ) (approximate' 



Weight (Dry ): 90'Tkg (2,000 lbs) 



Towing Speed : 1-5 knots (2.8km/hr) 



Power : 120 and UUO VAC, 60 Hz, 20 amps, winch: 12kW, Ijl+O V, 60 Hz, 



3 phase. 



Instrumentation: CCTV (uses strobe light for illumination and produces 



successive reproductions of individual exposures), side scan sonar, stereo 



camera system, proton-precession- type magnetometer, sub-bottom profiler 



(1+kHz, 50 to 100m penetration typical), pressure/depth gage, speedometer, 



water temperature sensor, up/down-looking echo sounder, forward-looking 



(obstacle avoidance) sonar, plankton sampler (optional), magnetic compass, 



transponder. 



Navigation: Bottom-oriented transponder positioning system providing 



2 to 5m (T to 16 ft) accuracy. 



Support Ship Requirements: Must have installed winch or equivalent deck 



load carrying capability, ability to install crane, space for 2m x 3m 



(6 ft X 10 ft) storage and workshop van, at least 37 sq m (UOO sq ft) 



of enclosed and dry lab area. Ship must have good low speed propulsion 



(diesel electric, cycloidal propulsion, variable pitch propellers, auxiliary 



low speed system, etc.) and bow thruster with enough horsepower to turn 



into a reasonable wind while maintaining a U, 536kg (10,000 lb) line pull 



at 1 to 2 knots. Almost any AGOR or AGSS should be satisfactory. Offshore 



drilling supply boats often satisfy all but the low speed capability, 



which could be provided by a pair of Murray-Tregurtha Harbormaster \inits, 



and the laboratory and living space requirements, which can be met 



with vans. Power: 20 amps of reasonably regulated 60 Hz 110 V single 



phase for the actual equipment. Crane has its own small diesel engine. 



Winch (if not normally installed) required 120 kW i+UO V, 60 Hz, 3 phase power. 



Crew : 13 for 2^+ hour operating capability, six of these must be 



experienced in DEEP TOW operations. 



Status : Operational 



Builder /Operator : Marine Physical Laboratory 



San Diego, CA 



