Capture your student's interest and engineering abilities with KELVIN'S New Multihull Boat Design Challenge. Begin by students researching monohull, catamaran and trimaran boat designs. Have your students then design, build and test rubber band powered vessels that will travel down a tank of water in the fastest time. This kit includes two pieces of balsa wood for pontoons, high density foam, competition rubber band, prop assembly and detailed instructions. Bulk Pack for 10 Students.