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post #2 of Old 07-31-2012
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Re: speed vs wind

On a broad reach, a sail powered vehicle can exceed wind speed. It's been done on ice and salt flats or paved surfaces, but to my knowledge not on water. Or maybe only on land. I remember reading about a windmill sort of contraption that used wind power to drive the wheels mechanically. I don't recall the details, but think this moment that its claim to fame was its ability to exceed windspeed directly upwind. (In all cases, the apparent wind is the issue. Dead downwind, you can never exceed windspeed. Upwind, though, the v-squared relationship is beneficial, although aero drag also increases at that same rate.)
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