A boat that has a central hull, a pair of floats, and a pair of outrigger spars for supporting the floats on each side of the hull. The outrigger spars are adjustably mounted on the hull so that the floats can be adjustably placed in a given range of positions that lie both (i) substantially spaced away outboard of the side beam of the central hull as well as (ii) substantially spaced rearward of the stern of the central hull. The floats are much smaller than the central hull, partly so that the central hull can be formed with storage recesses in the side-boards thereof for removably storing the floats in a stored position during non- use of the floats. The outrigger spars are preferably mounted to the central hull at or near the opposite rear corners thereof. Also, the outrigger spars are preferably mounted to the central hull for pivotal movement in generally horizontal planes. The boat further includes a set of locking mechanisms between the spars and the central hull, for releasably locking the spars in set positions. Additionally, the spars can be locked in position independently of each other and therefore need not be set in symmetric angles of divergence from the central hull.
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