BEAVER (ROUGHNECK) 



LENGTH: 26.3 ft 



BEAM: 11.5 ft 



HEIGHT: 10.3 ft 



DRAFT: 6.6 ft 



WEIGHT (DRY): 17 tons 



OPERATING DEPTH: 2.000 ft 



COLLAPSE DEPTH: 4,000 ft 



LAUNCH DATE: 1968 



HATCH DIAMETER: 25 in. 



LIFE SUPPORT (MAX): 360 man-hr 



TOTAL POWER: 44 kWh 



SPEED (KNOTS): CRUISE 2.5/8 hr 



MAX 5/0.3 hr 



CREW: PILOTS 2 



OBSERVERS 2 



PAYLOAD: 2,000 lb 



PRESSURE HULL: Two spheres joined by a cylindrical tunnel. All hull components are of HY 100 steel. The forward hull is 7-ft OD and 0.481 in. 



thick with an overhead access hatch. The aft hull is 5.5-ft OD; 0.387 in. thick and has a diver lock-out hatch on the bottom. The connecting tunnel is 



25-in. ID; 71 in. long and 0.75 in. thick. 



BALLAST/BUOYANCY: Main ballast is obtained from two 24-ft3-capacity (each) tanks mounted port and starboard. A variable ballast system 



(combined with the trim system) is capable of obtaining neutral buoyancy within +1.5 ft by admitting or blowing seawater from two, port/starboard 



spherical tanks. A hydraulically-driven stern winch carries 500 ft of cable to which an anchor may be attached (2,000-lb capacity). 



PROPULSION/CONTROL: Three 18-in. diam. propellers provide all propulsion. One thruster is mounted topside and the other two port and 



starboard just below the centerline; all are driven by a 5-hp motor. The inverted "y" configuration of the propellers and their control (360° 



rotatable; reversible) allows six degrees of freedom maneuvering and hovering. 



TRIM: Between three spherical tanks, one aft (1,238 lb) and two amidships (943 lb each), 1,474 lb of water can be transferred in various 



combinations to produce +30*^ pitch and +12° roll. 



POWER SOURCE: Main power source is from pressure-compensated, lead-acid batteries which provide 30 kWh at 64 VDC to propulsion motors and 



hydraulic motors. Auxiliary power is from pressure-compensated, lead-acid batteries which provide 14 kWh at 28 VDC to lights, vehicle controls. 



electronics. Emergency batteries in the forward sphere are sealed, non-gassing, lead-acid and provide 24 V at 8 amp-hr to jettison squids. 



LIFE SUPPORT: Both forward and aft pressure hulls have a fife support capacity of 48 hr each. A self-contained automatic O2 supply is carried 



within the hull and Baralyme and Purafil scrubbers remove CO 2- The aft sphere can be pressurized to a maximum depth of 1 ,000 ft, but cannot be 



depressurized less than ambient pressure. 



VIEWING: There are 11 acrylic plastic viewports, 1 in each of the 2 hatches and 9 in the forward pressure sphere. These nine ports are equipped 



with blowers to prevent fogging. These ports have a 5.19-in, ID, an 8.75-in. OD, are 1,78 in, thick, and have a 70° field of view underwater. Of the 



nine main viewports, five look ahead, down, and to the sides. These are the ports most commonly used during oceanographic missions. The 



remaining four ports look upward and are used primarily during work or inspection missions. The small port in the hatch of the forward sphere has a 



2. 19- in. ID, a 3.65-in. OD, and a thickness of 0.73 in. The smallest port, located in the hatch of the after sphere, has a 1 .1 15- in. ID, a 1 .87 5- in. OD, 



and is 0.38 in. thick. 



OPERATING/SCIENTIFIC EQUIPMENT: UQC(8.087-kH2) Pan- & titt-mounted TV camera (W/90° pan), interior still camera synchronized 



w/exterior strobe, sonar, gyrocompass, speedometer, depth gage, current meter (speed & direction) w/optional strip chart recorder, 



upward/downward-fooking sonar w/strip chart recorder, depth indicator w/visual or strip chart recorder readout, azimuth-scanning sonar w/CRT 



readout, exterior-mounted 70-mm stiM camera, two 200-W-sec strobes, interior-mounted 16-mm cine camera w/400-ft capacity, 35-mm and 2Vd-in.2 



still cameras, water sampler (sample is drawn directly into aft sphere). 



MANIPULATORS: Each of the two manipulators has a 9-ft reach, eight degrees of freedom, and a 50-lb lifting capacity. The two manipulators can 



be equipped with nine different tools to perform various tasks. These tools are: impact wrench, hook hand, parallel jaws, cable cutter, stud gun, 



centrifugal pump, grapple, drill chuck, and tapping chuck. Rates of motion are variable. 



SAFETY FEATURES: Non-combustlble or slow-burning material within pressure hull, external fittings for gas replenishment. The following is 



jettisonable by emergency electrical power: Propellers (40 lb each), manipulators (150 lb each); pan/tilt lights, camera and current sensor {155 lb 



total), anchor (100 lb) and main battery (2,532 lb). Emergency battery, breathing systems and seawater actuated flashlights, pinger, marker buoy 



with dye and recovery attachment, flares. Personnel may lock-out. 



SURFACE SUPPORT SOO. 



OWNER: International Underwater Contractors, New York. 



BUILDER: North American Rockwell Corp., Seal Beach, California. 



REMARKS: Operational. The above description is as the vehicle was originally built. 



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