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GY21 Amphibious Catamaran

Yet another amphibious boat designed for a keen New Zealand diver.

The 6.52m Catamaran,  is designed to be built from marine grade aluminum alloy.

As a day diving boat and taking a lots of gear on board the design brief was for a large cockpit (3.36m length X 2.145m wide).

The cockpit floor is fully welded and provides watertight compartments in both hulls. Its level is above the water surface which makes the cockpit self-draining (thru 2 large transom mounted spring loaded scuppers).

There are also 2 watertight bulkheads in each hull.

This amphibious catamaran is capable to be driven on tidal and soft sand.

Specifications

Length Overall

5.70m

(incl. the anchor plates and swim platforms)

Hull Length 5.10m
Beam 2.14m
Draught (Engine up) 0.30m
Displacement (Full load) ~1000kg
Weight to immerse 1.0cm 67.0 Kgf/cm
Deadrise at transform 19 Deg
Engine (outboard) 50-90hp