YOMIURI 



LENGTH: 14.5 m 



BEAM: 2.45 m 



HEIGHT: 2.80 m 



DRAFT: 2.20 m 



WEIGHT (DRY): 41 tons 



OPERATING DEPTH: 300 m 



COLLAPSE DEPTH: 519 m 



LAUNCH DATE: 1964 



HATCH DIAMETER: 63.5 cm 



LIFE SUPPORT (MAX): 492 man-hr 



TOTAL POWER: 45 kWh 



SPEED (KNOTS); CRUISE 2/10 hr 



MAX 3/6 hr 



CREW: PILOTS 3 



OBSERVERS 3 



PAYLOAD: 1,900 lb 



PRESSURE HULL: Cylindrical shape with one heml-spherical endcap (stern) and one spherical mirror plate(bow). Hull material is high tensile steel 



(46 Hg/mm^), cylinder is 2.05-m OD, 16 mm thick and 10.683-m length. Stern endcap is 1.02-m radius, bow endcap is 2.0-m radius. 



BALLAST/BUOYANCY: The superstructure above pressure hull serves as the surface buoyancy tank with a capacity of 8 tons and is blown by 



compressed air. A 2-ton-capacitv ballast tank is located within the pressure hull which is flooded to descend and pumped dry to ascend. 



PROPULSION/CONTROL: A 12-kW, 100-rpm motor drives a 3-bladed, stern-mounted propeller for forward propulsion. A vertical rudder and 



horizontal stern plane aft of the propeller provides vertical and lateral maneuvering. 



TRIM: Two tanks of 0.4-ton capacity each are within the pressure huM (fore and aft) between which seawater is pumped to obtain desired trim 



angles. 



POWER SOURCE: Fifty lead-acid batteries within the pressure hull supply main power to the vehicle. An AC motor generator supplies AC power at 



60 Hz, 11 V and 1 .5 K V A. Battery recharging is performed at the surface by the submersible's motor generator. 



LIFE SUPPORT: O2 is carried in a 46.7-1 flask. COj is removed with LiOH scrubbers. During battery charging a fan circulates air in the pressure 



hull and the gases generated by charging are removed by absorbing them into the (recharging) diesel engine. 



VIEWING: Two viewports are in the bow of the pressure hull and one is in the bottom. They are 120-mm diam. and 62 mm thick and are made of 



optically homogeneous glass. Four viewports in the access trunk (conning tower) are 60-mm diam. and 40 mm thick. 



OPERATING/SCIENTIFIC EQUIPMENT: UQC, obstacle avoidance sonar, echo sounder, transponder. 



MANIPULATORS: One with six degrees of freedom. 



SAFETY FEATURES: Breathing masks are provided for each occupant in emergency. Two droppable blocks of 400-kg weight. Skirt under access 



trunk can be used to exit the vehicle by pressurizing interior. 



SURFACE SUPPORT: Vehicle is towed and supported at dive site by the 34.57-m (LOA), 235.7-ton ship YAMAMOTO. 



OWNER: Yomiuri Shimbu Newspaper, Tokyo. 



BUILDER: Mitsubishi Heavy Industries, Kobe, Japan. 



REMARKS: Not operating. 



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