JIM 



LENGTH: 



BEAM: 3.1 ft 



HEIGHT: 6.5 ft 



DRAFT: 



WEIGHT (DRY): 1,100 lb 



OPERATING DEPTH: 1,300 ft 



COLLAPSE DEPTH: NA 



LAUNCH DATE: 1973 



HATCH DIAMETER: NA 



LIFE SUPPORT (MAX): 16 man-hr 



TOTAL POWER: Manual 



SPEED (KNOTS): CRUISE NA 



MAX NA 



CREW; PILOTS 1 



OBSERVERS 



PAYLOAD NA 



PRESSURE HULL: Main body and dome, knee spacer and boots are composed of magnesium alloy RZ5. All joints are composed of aluminum 



alloy forgings, as are the elbow spacers and hand enclosures. 



BALLAST/BUOYANCY: Lead ballast of approximately 150 lb is required to reach neutral buoyancy. Additional buoyancy of 15 to 50 lb 



(depending upon bottom conditions) is required for negative buoyancy. This ballast is jettisonable. For independent mobility the lifting cable can be 



jettisoned. By dropping all ballast the operator will ascend at a rate of about 100 fpm. 



PROPULSION/CONTROL: A lift cable provides ascent/descent. Mobility on the sea floor is by walking. 



TRIM: No systems provided. 



POWER SOURCE: Manual. 



LIFE SUPPORT: Sufficient O2 is carried externally in two flasks (440 I at 1 50 atm. each) and provides 4 hr for working with a 1 2-hr reserve. The 



operator yvears an oronasal mask with an inhale and exhale tube, both are connected to CO2 scrubbers (soda lime) and work at atmospheric pressure. 



Two complete O2 and CO2 sets are provided, one for backup. Monitoring instruments in the suit are for O2 internal pressure, temperature. 



Lightweight clothing can be worn and in the waters where Jl M has worked (Scotland) the internal temperature has stabilized at 19 to 20 °C. 



VIEWING: Four viewports in the dome and two at the back. The viewports are concave-convex lenses machined from Plexiglas 222. 



OPERATING/SCIENTIFIC EQUIPMENT: Compass. 



MANIPULATORS: Initially four simulated fingers were used and operated on a 1-to-1 mechanical linkage with a thumb on a swivel base, though 



satisfactory, other alternatives to these general purpose manipulators are beTng sought. 



SAFETY FEATURES: Lift cable can be released if snarled. Ballast jettisonable. Two life support systems. 



SURFACE SUPPORT: SOO. 



OWNER: DHB Construction Ltd., England. 



BUILDER: Underwater Marine Equipment Ltd., Farnborough, Hants, England. 



REMARKS: Developmental stage in August 1973 at which time it had dived to 442 ft. Classification to 1,300 ft operating depth was under 



contemplation by Lloyds Register of Shipping, JIM's design and operation fulfill every definition of a manned submersible (chap. 1 ). 



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