Abstract: A hollow semi-rigid cigar-shaped float formed with helical external projections in the form of two corkscrew threads for use in water sport. Each corkscrew thread projection is formed from the middle of the float to an end, with one end of the float shaped as a right hand thread and the other shaped as a left hand thread. When a swimmer stands on the middle portion of the float, in water, and causes the float to rotate, the effect of the external rotation of both threads in the water, cancels any sidewise thrust of either thread. However, by shifting his position on the float so that a greater length of one thread is immersed in the water, the user may cause the float to move in one axial direction or the other, when the float is caused to rotate, in simulated log-rolling fashion.