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409 Posts
Don’t believe everything you read on the internet.
This is breaking basic laws in thermodynamics.
In short, it does not work. Losses in the energy conversion make it impossible to generate more than you consume. This idiot is actually reducing his range.
This is breaking basic laws in thermodynamics.
In short, it does not work. Losses in the energy conversion make it impossible to generate more than you consume. This idiot is actually reducing his range.
Ships have been extracting energy from headwinds for centuries.
That’s pretty cool!
Hum.. sailboat can sail at a narrow angle, minimum 45deg about, with APPARENT wind. The angle with real wind is much wider. Boat with better design can sail closer into wind. But no way it can sail directly into wind, apparent or real. It doesn't exact energy from the head wind. But rather, the energy exacted from the wind abeam is enough to compensate for the loss due to the head wind, and to keep the boat speed.
A lunch paid by someone else is not really free.
-TL
Sent from my SM-N960U using Tapatalk
A lunch paid by someone else is not really free.
-TL
Sent from my SM-N960U using Tapatalk
So when wind is blowing east to west, and you sail east, this is an illusion? lol
When wind is east to west, you CANNOT sail directly to the east. But you can go NNE for a mile and SSE for the next, and zigzag back and forth. You would end up going east, but never directly.
-TL
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I didn't say you could. The energy to go against the direction of the wind, even if it requires zigzagging, is coming from that wind, unless you are thinking maybe it is downhill?
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6,638 Posts
No patience for video but read about this a while ago. It's not like a sailboat going into a headwind, it's like a sailboat going directly downwind. The boat cannot go faster than the downwind speed, which makes sense, right? Well, this craft can go downwind faster than the actual wind, which doesn't make sense, but works.I didn't say you could. The energy to go against the direction of the wind, even if it requires zigzagging, is coming from that wind, unless you are thinking maybe it is downhill?
Don't get hung up on the direction of travel, or the wind direction. As long as the energy extracted from the wind is greater than the rolling, and aero drag you can move forward.
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6,638 Posts
So you have a propeller powered by wind driving the car. The car gets up to the same speed as the wind, so the propeller sees a wind speed of zero. How do you extract energy from the wind at that point?
That's the problem with assuming spherical cows (sorry, old physics joke). It turns out that wind speed isn't steady, but varies slightly. If you can extract energy when it varies above, without losing energy when it varies below, you can go "faster" than the wind.
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6,638 Posts
That was the argument of the physics professor that bet $10,000 it wouldn't work. He claimed it was just temporary and the vehicle couldn't sustain a speed higher than the peak wind speed. He lost the bet.
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