SDL-1 



LENGTH: 25 ft 



BEAM: , 10 ft 



HEIGHT: 8 ft 



DRAFT: NA 



WEIGHT (DRY): 14.25 tons 



OPERATING DEPTH: 2,000 ft 



COLLAPSE DEPTH: . 4,000 ft 



LAUNCH DATE: 1970 



HATCH DIAMETER: fore sphere 25 in. 



aft spfiere 22 in. 

 tunnel 22 in. 



LIFE SUPPORT (MAX): 204 man hr 



TOTAL POWER: 68 kWh 



SPEED (KNOTS): CRUISE 1/8 hr 



MAX 2/4 hr 



CREW: PILOTS 1 



OBSERVERS 5 



PAY LOAD: 1,300 lb 



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



thick with an overhead access hatch. Aft hull is 5.5-ft OD, 0.387 in. thick with a bottom diver lock-out hatch. Connecting tunnel is 25-in. ID; 71 in. 



long and 0.75 in. thick (Identical to BEAVER hulls.) 



BALLAST/BUOYANCY: Main ballast tanks forward and aft which can be blown at 2,000 ft to supply 7,000-lb lift. Two variable ballast spheres 



(tanks) hold approximately 780 lb of seawater and a're filled and emptied by a pump. In the event of pump failure the VBT's can be blown dry. Two 



lead blocks each weighing 350 lb can be dropped in the event of an emergency. Syntactic foam provides additional positive buoyancy. A 



hand-operated bilge pump is in the diver's compartment. 



PROPULSION/CONTROL: Two, 5-hp port/starboard side-mounted, reversible, variable-speed thrusters provide lateral maneuvering. Thrusters are 



fixed in a horizontal position, but may be operated independently to provide maneuvering about the vertical. 



TRIM: Bow angles of ±30° can be obtained by moving one of the battery packs and droppable lead weights fore or aft. Movement is accomplished 



by a hydraulic pump. 



POWER SOURCE: Externally-mounted, pressure-compensated, lead-acid batteries supply 60, 120, 12, and 28 V from three separate banks totaling 



495 amp-hr. Emergency power is from two 15-V nickel-cadmium batteries. 



LIFE SUPPORT: O2 is carried externally in a 750-SCF, 3,000-psi tank and internally in two 60-SCF tanks. Each sphere contains a CO2 scrubber. 



O2 is controlled automatically and partial pressure is constantly monitored in both spheres. CO2 "S monitored with a Drager system in the forward 



sphere, as is temperature and pressure. 



VIEWING: Ten acrylic plastic viewports (identical to BEAVER). 



OPERATING/SCIENTIFIC EQUIPMENT: UQC, scanning sonar, up/down sounders, aircraft gyrocompass, two depth gages. 



MANIPULATORS: Two; one is articulated, the other is for grasping. 



SAFETY FEATURES: Hydraulically jettisonable weights, motors and manipulators. Pinger, flashing surface light. Emergency breathing masks, fire 



extinguishers, VHF radio transceiver, pinger. 



SURFACE SUPPORT: SOO. 



OWNER: Canadian Forces, Halifax, Nova Scotia. 



BUILDER: International Hydrodynamics Ltd., Vancouver, B.C. 



REMARKS: Operational. The pressure hulls of this vehicle were originally intended for a second BEAVER, but these plans never materialized. 



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