Abstract: Retractable hulled catamaran boat comprising: Central body also port and starboard hulls. Said body having port and starboard walls with entry openings; also floor with underside having hull span stop means and being smooth and/or having track or channel system for said hulls retractable mounting. Said hulls with upright means having inboard sides with mounting means for roller (slider) mounting on said floor underside enabling hull retraction under said body or extension and having outboard sides attaching an associated hull roof. First embodiment said roof being minimum two fastened panels. Second and third embodiments said roof being three dimensional enclosure. First and second embodiments said roof free top/inboard edge attaching associated said walls. Third embodiment said roof inboard edges angled forming outward span stop and each said roof travels through opening in associated said walls. Said roof folds, detaches, or retracts allowing hull retraction.

Abstract: A catamaran central body portion with floor having front and mid walls also port and starboard side walls and smooth underside having flange lips in alignment with said side walls forming mating surfaces for attaching two roof sheltered hulls whereby said hulls attach to said lips likewise roofs attach to said side walls forming a disassemble catamaran boat. Roofed alcove enclosed by said front, mid, and side walls. First and second embodiments having bridge area with navigation controls rearward of said alcove and further rearward a passenger area. Third embodiment having passenger area roofed cabin rearward of said alcove and further rearward a bridge area with navigation controls. Hull entry openings in both said side walls are in passenger area of first and third embodiments and in bridge area of second embodiment. Rear portion of said side walls having wall bracing structures for strengthening.