TRIESTE II 



LENGTH: 78.6 ft 



BEAM: 1 5.25 ft 



HEIGHT: 26.9 ft 



DRAFT: 21ft 



WEIGHT (DRY): 87.5 tons 



OPERATING DEPTH: 20,000 tons 



COLLAPSE DEPTH: >40,000 ft 



LAUNCH DATE: 1964 



HATCH DIAMETER: 19.8-in. ID 



LIFE SUPPORT (MAX): 72 man-hr 



TOTAL POWER: NA 



SPEED (KNOTS): CRUISE 2/12 hr 



MAX NA 



CREW: PILOTS 2 



OBSERVERS 1 



PAYLOAD: 5 tons 



PRESSURE HULL: Spherical shape composed of two hemispheres of HY-120 steet damped together on an equatorial flange. ID of 84 in., 3.9 in. 



thick to 6 in. at viewports and penetrations. 



BALLAST/BUOYANCY: Aviation gasoline (65,830 gal) is carried in a thin-walled float to provide positive buoyancv- Electromagneticalty hetd iron 



shot (22 tons) provides negative buoyancy and is incrementally released to ascend or decrease the vehicle's buoyancy. Trailing ball (250 & 750 lb) on 



150-ft cable. 



PROPULSION/CONTROL: Three, stern-mounted, 1,750-rpm, 120-VDC, 6.5-hp (each) motors provide main propulsion. A horizontal thruster is 



mounted on the bow. 



TRIM: Shot hoppers mounted port/starboard amidships and one aft may be differentially filled to obtain ±12 list, and +33 to —27 down bow 



angles at 20,000 ft. 



POWER SOURCE: Externally-mounted, pressure-compensated silver-zinc batteries. Sixteen cells provide 5,000 amp hr apiece at 24 V and 80 cells 



provide 952 amp-hr apiece at 120 V. 



LIFE SUPPORT: Gaseous Oj, three bottles, each 72 ft^ at 2,250 psi (two normal, one emergency). CO2 removed by LiOH. Monitors for O2, CO2. 



cabin pressure, temperature and humidity. Air conditioning system, Hull heat exchange system. Emergency breathing off Oj bottle. 



VIEWING: Four plastic viewports. One is 16-in. OD, the remaining three are 3-in. OD. 



OPERATING/SCIENTIFIC EQUIPMENT: UQC, CTFM sonar. Doppler navigator, X-Y plotter, gyrocompass, altitude/depth sonar, echo sounder, 



transponder interrogator system, sound velocimeter, three still cameras, one cine camera, three TV's. 



MANIPULATORS: One with six degrees of freedom. 



SAFETY FEATURES: Shot and several outboard equipments jettisonable. Emergency breathing of 36 man-hr. Fail-safe shot jettison. Fire 



extinguisher. Distress rockets. Surface lights. 



SURFACE SUPPORT: Transported by floating Dry Dock towed by an ocean-going tugboat. 



OWNER: U.S. Navy, Submarine Development Group One, San Francisco, Calif. 



BUILDER: U.S. Navy, Mare Island Shipyard, San Francisco, Calif. 



REMARKS: Operational. Studies underway to substitute aviation gasoline with Isopar F., a lower flash-point fluid. Since its first major 



modification in 1964, TRIESTE II has undergone numerous, significant design and operational changes. The above description is how it now (Aug. 



1974) stands. 



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