Abstract: An elongated structural member is provided for releasable anchoring at one end to one end of either the fore or aft transverse bracing structure extending between and anchored relative to fore and aft portions, respectively, of the hulls of a catamaran. The elongated structural member is positionable in a plane normal to the longitudinal centerlines of the hulls and inclined generally 45.degree. relative to a plane containing the hull members with the other end of the structural member spaced outwardly from the underside of the remote hull. An elongated flexible tension member is attached at one end to the remote hull member, the mid-portion of the tension member is engaged with the other end of the structural member and the other free tension member end is free and includes handgrip means.