SEA CLIFF & TURTLE 



LENGTH: 26 ft 



BEAM: 12 ft 



HEIGHT: 12 ft 



DRAFT: 7.4 ft 



WEIGHT (DRY): 24 tons 



OPERATING DEPTH: 6,500 ft 



COLLAPSE DEPTH: 9,750 ft 



LAUNCH DATE; 1968 



HATCHDIAMETER: 19.75in. 



LIFE SUPPORT (MAX): 100 man-hr 



TOTAL POWER: 60 kWh 



SPEED (KNOTS): CRUISE 1/8 hr 



MAX 2.5/1 hr 



CREW; PILOTS 2 



OBSERVERS 1 



PAYLOAD: 300 lb 



PRESSURE HULL: Spherical shape of 1 .33-in. -thick, quenched and tempered HY-100 steel. Sphere is 7-ft OD of two welded hemispheres which 



thicken to 3.5 in. at viewports. Entire sphere stress-relieved. 



BALLAST/BUOYANCY: The submerslbles descend by flooding the two main ballast tanks and partially emptying the two variable ballast oil-filled 



bladders into the four variable ballast tanks. This variable ballast system is the primary ballast control for diving and surfacing. The variable ballast 



system can attain a buoyancy differential of 880 lb. The two main ballast tanks are used primarily to gain freeboard while on the surface. 



PROPULSION/CONTROL A single stern shroud and propeller and two side propulsion units are the principal propulsion systems. The stern 



propeller is powered by a variable speed, hydraulic motor and can be trained through 45° left and right. The side pod propulsion units are powered 



by reversible, variable-speed, DC electric motors and can be trained together through 360° by an electric motor. The three motors and reduction 



gears are encased in a pressure-compensating oil environment and can be operated in three modes stern propeller alone, side pods alone, side pods & 



stern propeller together. 



TRIM; Up/down bow angles of +25° are obtainable by transferring 540 lb mercury/oil fo^e or aft to three (two forward & one aft) small fiberglass 



spheres. 



POWER SOURCE; Electrical power is supplied by two 60- V and two 30-V, pressure-compensated, lead-acid batteries. The 60-V batteries have a 



total capacity of 500 amp-hr at a 6-hr discharge rate; energy stored totals 30 kWh. The 30-V batteries also have a total capacity of 500 amp-hr at a 



6-hr discharge rate; energy stored totals 15 kWh. Power is available as: 120 VAC, 60 Hz, single phase, 120 VAC, 400 Hz, single phase. 60 VDC, 30 



VDC; 24 VAC, 40 Hz, three phase (fed directly to gyrocompass). Two 30-V, silver zinc safety batteries located within the personnel sphere have a 



total capacity of 12 amp-hr at a 1-hr discharge rate. 



LIFE SUPPORT; O2 'S carried in a 0.6-ft3 tank at 3,000 psi. LiOH is used to remove CO2 by air blown through cannisters at 7 SCFM. 



VIEWING : There are five viewports, four in the sphere and one in the hatch. The four main viewports are oriented one dead ahead, two (one each 



side) on the port and starboard quadrant at an approximate 40° declination and one on centerline looking downward at approximately 80 from the 



horizontal. The main ports are 3.5 in. thick with an ID of 5 in. and an OD of 12 in. The fifth smaller port is located in the center of the hatch and is 



used for obstacle avoidance and ambient light observations, it is 2 in. thick, has an ID of 2-^/8 in., and an OD of 6 in., and a 45 angle of view. 



OPERATING/SCIENTIFIC EQUIPMENT: UQC 18.087-kHz) Two closed-circuit TV cameras (one mounted on pan & tilt mechanism the other on 



starboard manipulator), gyrocompass, depth indicator, altimeter, speedometer, odometer, CTFM sonar, electromagnetic log, inclinometer, echo 



sounder. 



MANIPULATORS; Each submersible is equipped with two identical manipulators. Each manipulator can be equipped with tools to perform varied 



tasks such as drilling, cable cutting, and grasping of objects. These tools are stored in racks on the submersible and can be interchanged durmg a 



mission. Each manipulator is capable of seven degrees of freedom. 



SAFETY FEATURES: Emergency breathing apparatus (3 man-hr). Manipulators jettisonable. The three banks of batteries weighing 3.400 lb can be 



dumped. Ultimately, the personnel sphere and buoyancy ring can be separated from the rest of the vehicle from within the sphere; its 1,800 lb of 



positive buoyancy will float the sphere to the surface. Emergency power in pressure hull, 



SURFACE SUPPORT Air (C5A), ship and truck/trailer transportable. Presently launched/retrieved at sea aboard a leased offshore work boat of 



1 64-ft length, 1 98.4 tons and equipped with a 1 OO-ton-capacity non-articulated crane. 



OWNER; U.S. Navy, Submarine Development Group-One, San Diego, Calif. 



BUILDER: General Dynamics Corp., Groton, Conn. 



REMARKS; Both operational. These vehicles were originally designated AUTEC I 61 (!. The Navy's numbered designation is DSV-3 (TURTLE) and 



DSV-4 (SEA CLIFF). 



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