| 摘要 |
Two sets of idle rollers are fixed to the planing bottom of a boat, one set on each side, or to its appendices, for transforming the continuous movement of water against the V-shaped hull, responsible for hindering its forward progress, into a propulsive thrust. This results in faster forward drive, propulsive power being equal. Each set of rollers is housed in a rectangular container placed in a purposely made recess in the stern with the rollers lying perpendicular to the forward direction of the boat. The sets of rollers can be placed separately preferably close to the stern board and to the keel. These rollers are cylindrical or frusto-conical in shape, of any diameter, length and number compatible with the size of the planing bottom of the boat, their surfaces being smooth or suitably grooved to improve thrust, stability and drainage.
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