FWIW, Xyla Foxlin's side of the story: building a working treadmill model.
She could have saved herself a whole lot of trouble by getting the math right
Her first couple of models had the prop moving air faster than the wheels were going. Those models don't go faster than the wind downwind; if the prop moves faster than the wheels it takes more force to turn the prop against the wind than the wheels can provide. Instead it will turn the propeller with the wind and the wheels force the car against it. They may even go faster than the wind upwind, but they did not test that.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
Last edited by RedDevil; 07-08-2021 at 07:18 PM..
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