Crane Barge / Weed Cutter / Boot Retrieval system. Hull is made from 10millimeter thick marine plywood with the bow section sealed by a solid bulkhead, there is a second bulkhead in the centre of hull, dividing hull into three watertight sections. The box on stern (or container) has two uses, When empty it = Bouyancy . When crane is lifting heavy loads water is pumped in to counterbalance load. The weed cutter is a modified hedge trimmer, Fitted to a long drive shaft with motor fitted at top end of it, This allows it to be raised and lowered at will, depending on depth of water, It clamps to side of hull, And when not in use, it swivels under hull and comes up behind stern. It can also be removed easily, The boat retrieval system is operated by the crane, which lowers a large weighted net into water, Then you steer barge up to casualty and lift up net with boat inside. The crane can lift 35lbs with jib flat level with deck, When jib is upright it is considerably more.
Specs.
Crane jib height = 60inch when folded down 30inch
Load capacity = Straight ought level with deck =35lbs
Upright = Unknown at least 80lbs+
Depends on number of pulleys used on lift cable
Battery power =12volt 620 Amps = part of ballast
Hull size = Beam 30inch
= Length 64inchs
Depth of side panels = 8inch
= Weight at 4inch draught 273lbs. 1 inch =68lbs
Motors = Two direct drive to 75mm Korts 4 blade props
= Two bow thrusters, 60mm Korts 6 blade props
= Three large crane winch motors, = converted windscreen wiper
motors
= A powerful water pump to fill balance water tank
Electrics =I will not comment on this subject, study the photos? It might look complicated but is very basic, All switch boards are easy to remove for maintenance, if required. I find Micro Switches, Relays, And my oil cooled resistors very reliable, They might be old fashioned but they don’t blow up at the smallest problem,