So, initially, you get a forward accelerating force, which is proportional to the wind velocity.
What stops it from being perpetual motion? As you accelerate above windspeed, you'll start to suffer a vaccum effect - the wind is moving slower than the vehicle, so it'll effectively be sucking away some of the force generated by the propellor. So you'll need to start subtracting a force proportional to the relative windspeed from the amount of force you can generate from the propellor. Eventually, that vaccum force will equal GAvcart/2πr. As you get closer and closer, the amount of force that you'll be generating by spinning the propellor will be completely consumed - and you'll be at the maximum attainable speed in that amount of wind.
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