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DDWFTTW - Prop or Turbine
This video was made to address a common misconception about whether the wheels provide the torque that turns the prop or the prop (working as a turbine) provides the torque that turns the wheels. I...
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2. Have you considered that it is east to exceed wind speed at an angle to the wind? With the prop turning, it may be picking up some variations in the wind speed and running on that.
3. When _exactly_ at wind speed, there is no energy available from the wind, the cart should start on a level surface with no wind at all (inertial frames of reference.)
When _exactly_ at wind speed this vehicle is still able to extract energy from the wind relative to the ground, and use that energy to accelerate to beyond wind speed.