MAKAKAI 



LENGTH: 18.5 ft 



BEAM: 8 ft 



HEIGHT: 7.5 ft 



DRAFT: 5.9 ft 



WEIGHT (DRY): 5.3 tons 



OPERATING DEPTH: 600 ft 



COLLAPSE DEPTH: 4,150ft 



LAUNCH DATE: 19'1 



HATCH DIAMETER: 18.5 in. 



LIFE SUPPORT (MAX): 72 man-hr 



TOTAL POWER: 36 kWh 



SPEED (KNOTS): CRUISE 0.75/8 hr 



MAX 3 



CREW: PILOTS 1 



OBSERVERS 1 



PAYLOAD: 870 lb 



PRESSURE HULL: Acrylic plastic (Plexiglas G) sphere composed of 12 spherical pentagons bonded together with adhesive. Hull is 66-in. OD and 



2.5 in. thick. Top (hatch) and bottom plates are of cadmium plated 4130 steel. Bottom plate is for passage of penetrators. Hull weighs 1,500 lb in air 



and displaces 5,500 lb in water. A 0.5-in-thick acrylic cap around the pressure hull protects it from abrasion or accidental impact. 



BALLAST/BUOYANCY: Variable weight system consisting of four pressure-compensated ballast tanks mounted at each corner of the vehicle from 



which water mav be pumped into or out. System is limited to three complete fill/refill cycles by the volume of compressed air used for pressure 



compensation, 400 lb may be gained or lost. 



PROPULSION/CONTROL: Two Kirsten Boeing, pi-pitch cycloidal propellers provide four degrees of maneuvering freedom and are driven by a 4-hp 



hydraulic motor. 



TRIM: Gross trim is adjusted manually before diving by fore or aft movement of 1 ,200-lb (each) battery pods. Trim is controlled up or down by 



pumping water fore or aft in the ballast tanks. Roll is controlled by pumping water overboard on one side and taking water onboard on the other. 



POWER SOURCE: External, pressure-compensated, lead-acid batteries in two pods, each containing a 1 20-V and 30-V battery string. The 120-V 



string is made up of twenty 6-V, 190-amp-hr batteries which power the propulsion and ballast systems and lights. The 30-V string powers the 



controls, electronics and scientific instrument payload. 



LIFE SUPPORT: Oj is stored in the pressure hull in high pressure flasks and is bled through a pressure reducer at 2 ft^/hr. COj is removed by 



Baralyme and water vapor by silica gel. Both O2 and CO2 are monitored visually from instruments within the sphere. Three blowers circulate the air 



to remove water vapor and CO2. 



VIEWING: Panoramic viewing is provided through plastic pressure hull. 



OPERATING/SCIENTIFIC EQUIPMENT: UQC (8.08-kHz), two depth gages, altimeter. 



MANIPULATORS: None. 



SAFETY FEATURES: Emergency breathing through two closed-circuit O2 rebreathers of 36-hr capacity each. Pressure hull mechanically releasable 



from chassis. Jettisonable 50-lb ballast weight. Jettisonable 1 ,200-lb battery pods (2,400 lb total). Additional surface freeboard (3 ft total) may be 



obtained by inflation of four modules (one at each corner of the chassis). 



SURFACE SUPPORT: Air, ship, or truck/trailer transportable. May be launched/retrieved from conventional ship with necessary capacity handling 



system. Has been deployed and retrieved with LARP system (see chap. 12). 



OWNER: U.S. Naval Undersea Center, San Diego, Calif. 



BUILDER: USNUC, Kaneohe Bay, Hawaii. 



REMARKS: Placed in storage in 1974. 



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