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Old 06-16-2021, 11:41 PM   #13 (permalink)
ennored
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Quote:
Originally Posted by AeroMcAeroFace View Post
It doesn't require over-unity, because essentially the energy is coming from the difference between air speed and ground speed.
That's how I understand it. Traveling at say, 10 MPH, with a 7 MPH tailwind, you have 10 MPH of groundspeed to overcome a 3 MPH headwind.
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