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Whether it's a submarine, boat, car, whatever, if there is a propeller being driven by the wind it can provide forward motion, even directly upwind. Here's an example. If you're a high-speed wind sailor, you know why. You can sail upwind close-hauled, and the only thing that limits your speed is your drag in the water. Now suppose you tack back and forth - ...


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It is possible in theory but not realistic as you said in your question. You have to pay attention to anchoring mechanism. In water you can partially anchor by spreading a big sheet inside the water. The sheet should be spread in perpendicular direction to wind movement. This way, you can charge a battery while the submarine will move little backward. After ...


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This is not possible. The wind turbine has an efficiency that is somewhat less than 100%. The electricity generated by that wind turbine will power a motor that drives a propeller on the submarine, and the motor and propeller each have an efficiency that is somewhat less than 100%. By the time all of the efficiency losses are accounted for, conservation ...



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