- #76

- 3,042

- 16

To think I just read 5 pages of this...

To put it in complete layman's terms. Hold your hand out the window of a moving car. Then hold your hand out the window while holding a fan. The drag caused by the fan pushes your hand back harder now. If you have a 100% efficient wind turbine and a 100% efficient car engine you get all the drag added back as energy, but why? It would be easier to just directly couple the car engine to a generator, and that assumes everything is 100% efficient which is impossible. There is no way you can win.

If you decide to reduce drag and place a turbine in it's place then it's the same result. 10Kw required to keep the car at highway speeds, you reduce the drag to save 3kw then add a turbine that generates 1kw at 30% efficiency. Yup you win it now takes 10 kw to drive the car minus the 1kw you now generate, so 9kw. But, if you can reduce power required by 3kw then why add the generator? You can now drive at highway speeds on 7kw vice 10.

Somebody lock this thread please.

I have no idea where or what these "made up" power values come from.