Abstract: To permit rapid assembly and disassembly of the water cycle so that, when disassembled, it can be stored or transported in minimum space. The cycle, which has at least three flotation bodies (2a, 2b, 2c), which are elongated or torpedo shaped, is formed of tubular frame elements which are coupled together by push-in connectors with spring-loaded pin locks (9, 30, 30', 33, 41) so that individual frame elements (6,7,8; 12,13,14; 24,25) of the cycle can be disassembled into the frame elements, or, selectively, snapped together. The flotation bodies are preferably inflatable and formed with a keel. A pedal and crank arrangement is coupled to a transmission which can drive a propeller or, directly via a chain, a paddle wheel.