MINIMAX, Most Popular of All S&M Boat Plans - By WILLIAM D. JACKSON. Minimax is exactly what the name implies, a boat requiring the minimum in time and material to build that gives you the maximum in performance and water sport fun. It will carry two people, take outboard motors ranging from 3 to 15 hp, has a watertight air compartment that will support 900 lbs even with the cockpit completely filled with Water. As to performance, Minimax will plane a 165 lb. man up to 15 mph with a 3 hp outboard motor. With 10 hp and over, the hull planing area diminishes until Minimax becomes air-borne and rides upon the motor's cavitation plate. The Minimax was, in the late 50's - early 60's, what the jet ski is today. Just a fun little hydroplane for tooling around. Basically two sheets of plywood slapped together ......advertised "Build for under $20 in one weekend". Of course that didn't include steering hardware, etc, but inexpensive none the less.