The invention relates to a wind-powered boat or craft. The vertical rotational plane for a wind propeller 5 rotating about the lateral axis 6 can be pivoted or turned about a vertical axis. From the wind propeller 5, a power transmission 12-15 has been arranged to an underwater propeller 16. As it rotates, the wind propeller 5 acts both as a sail surface and as a power source for the water propeller. IMAGE
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