Robic, Robic & Associates
Screw propelled water saddle
 A screw-propelled, water saddle for ride on a water surface. This water saddle is supported by two parallel floats, properly spaced apart and joined by at least one emerging cross-member. A central bar or tubing is fixed parallel to the floats at the middle of the cross-members. The saddle is mounted on the rear part of the central bar approximately at the center of the area defined by the floats while the front end of the same receives a removable propelling and steering device comprising a screw-propeller driven by a pair of pedals and a handle-bar for steering the propeller in a given direction. The rider takes place on the saddle, puts his feet on the pedals and activates the handle-bar to place the propeller in the desired direction. This screw-propelled water saddle is particularly interesting because of its simplicity, lightness, stability, speed and manageability. 
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Georges
Moore