Abstract: A water-craft which comprises a swing assembly including opposed seats and a foot-rest arranged to each make a reciprocative movement and a transmission mechanism to convert the reciprocating movement of the seats into a rotary movement to actuate a paddle-wheel for propelling the craft. The transmission mechanism includes reciprocating pairs of angularly adjustable one-way grippers which grip an endless belt for moving the latter in one direction or in the other or which clear the belt to propel the craft forwardly or rearwardly, or to permit use of the swing assembly while the craft remains stationary.