SEA OTTER 



LENGTH: 13.5 ft 



BEAM: 5 ft 



HEIGHT: 7.2 ft 



DRAFT: 5.5 ft 



WEIGHT (DRY): 3.2 tons 



OPERATING DEPTH: 1,500 ft 



COLLAPSE DEPTH: 3,650 ft 



LAUNCH DATE: 1971 



HATCH DIAMETER: 19 in. 



LIFE SUPPORT (MAX): 192 man-hr 



TOTAL POWER: 13.8 kWh 



SPEED (KNOTS): CRUISE 1/6>r 



MAX 3/1.5 hr 



CREW: PILOTS 1 



OBSERVERS 2 



PAYLOAD: 550 lb 



PRESSURE HULL: Two 0.625-in. -thick, section welded, mild steel, hemispheric sections are welded to the ends of a 0.75-in. -thick, 57.0-in.-long, 



48.0-in.-wide, mild steel cylinder, with a 0.75-in. -thick, 19.0-in.-diam., hatch tower welded in with double plates to the pressure hull. 



BALLAST/BUOYANCY: Launched positively buoyant. Buoyancy is controlled by two 250-lb main buoyancy air/water ballast tanks and two 



62.5-lb forward trim air/water ballast tanks. The tanks are alternately flooded and vented for descent, ascent and trim as required. Venting air is 



supplied by a BOO-ft^, 3,000-psi air flask. 



PROPULSION/CONTROL: A 3-hp, DC motor drives a 9-in. by 15-in. propeller for main propulsion. Two Vi-hp, DC, horizontal thrusters located 



fore and aft provide steering along with a hydraulically controlled rudder (mounted on the main thruster) which serves as a trim tab for use in cross 



currents. A Va-hp vertical thruster is mounted forward. All thruster and main propulsion motors are air compensated. A Kort nozzle surrounds the 



stern propeller. 



TRIM: Bow angle and fine trim are controlled by high pressure (3,000-psi) air and water in either the main or forward ballast tanks. 



POWER SOURCE: Twelve 2-V lead-acid batteries provide 13.8 kWh. They are located inside the pressure hull and are equipped with catalyzers to 



eliminate H2- 



LIFE SUPPORT: Three 40-ft^ tanks of medical grade O2 supply the life support system. Scrubbing of CO2 is accomplished by recirculating air 



through a 6.4-lb LiOH cannister. Three cannisters provide 192 man-hr of available life support on each dive. CO2 and O2 percentages along with 



atmospheric pressure are monitored. A backup emergency breathing system (air supply through mouthpieces), is also provided off the high pressure 



air. 



VIEWING: Four viewports are provided forward for the pilot and passengers, with two viewports along the side to accommodate reading 



externally-mounted instruments. Three viewports are located in the hatch tower, providing 270 of viewing and one viewport is located in the hatch, 



providing visibility toward the surface. 



OPERATING/SCIENTIFIC EQUIPMENT: Two underwater telephone systems are provided (27-kHz primary, 42-kHz secondary). A directional 



gyrocompass and a narrow, horizontal bandwidth, 27-kHz receiving antenna are provided for navigation along with five air-compensated lights 



totaling 1,5 x 10^ cp of illumination. Also provided are external depth and temperature gages, a pressure gage, a Hydro Products 400-exposure 



70-mm camera and strobe, 1 6-mm cine camera with a capacity of 400 ft of film and a video camera with both audio and video recording capabilities. 



A 23-channel CB radio is provided for surface communication and direction finder location. A 27-kHz pinger for location, tracking and 



diver/submersible rendezvous operations and a upward/downward-looking echo sounder. 



MANIPULATOR: The Beaver MKI Manipulator gives all the degrees of freedom of the human arm and hand plus 360° of rotation at the wrist and a 



wrist extension. Additional tools are available and can be provided on the manipulator for specific tasks. An "A" frame which is hydraulically 



controlled is also provided and is utilized as an attachment point for core samples, cable cutters, collection basket and many other simple tasks and 



applications as required. 



SAFETY FEATURES: A 200-lb, mechanically-releasable, emergency ascent weight. A releasable buoy and messenger line that can be released by the 



pilot through a thru-hull penetrator. A magnesium release pin is used to provide release if the pilot is incapacitated. The messenger line is used to 



send down a self-tocking clamp and lift line. The submersible can be retrieved even if flooded. Eight hours of emergency breathing air is also 



provided. Xenon light, life vests, fire extinguisher, distress rockets, CB radio, emergency food rations. 



SURFACE SUPPORT; Can be transported by aircraft, ship, truck, or trailer. Submersible Is normally on a trailer and can be launched from small 



boat launching ramp. Can be towed at 4-5 knots. Tows completely submerged. 



OPERATORS; Arctic Marine, Ltd., North Vancouver, B.C., Canada. 



BUILDER: Anautics Inc., San Diego, California. 



REMARKS: Operational. This vehicle was originally PAULO I, it was purchased by Candive of Vancouver, B.C. and is now leased by the present 



operator. 



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