6 and 7 are attached to the hull by hinges and can also serve as decking if so desired they could be replaced by an open framework fig2 shows the floats 2 and 3 in the retracted position with the forward outriggers 4 and 5 pivoted about upright axes in a forwards direction until they are alongside the central hull 1 and the after outriggers 4 and 5 also about upright axes pivoted sternwards until they too are alongside the central hull 1 the triangular braces 6 are folded upwards and the rectangular braces 7 are folded downwards outboard of the retracted floats 2 and 3 and within their hinge lines fig3 is similar to fig2 but the braces 6 and 7 have been removed for clarity referring now to fig4 which shows a portion of the central hull 1 and the inboard end of one of the outriggers 4 the central hull has at least a portion of its deck 21 overhanging to provide a mounting for an upper outrigger journal 22 a corresponding lower outrigger journal 23 is mounted in a projection 24 from the side of the central hull 1 beneath the projection 24 is a fixed support 25 providing inboard support means for the float 2 not shown for strength the fixed inboard support 25 is attached to both the hull 1 and the projection 24 the cross section of the fixed support is an inverted t member the outrigger 4 which is shown in the figure is pivotally attached to the hull 1 by an upright hinge pin 26 which is rotatably located by the journals 22 and 23 the outrigger 4 has a horizontal lower member 27 which has a cross section the same as that of the fixed support 25 i.