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  #1  
Old 07-28-2021, 05:52 PM
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UCLA physics professor makes a bet and loses. vehicle is faster than the wind.

Quote:
Blackbird is so counterintuitive, in fact, that less than a week after Muller released his video (below), Alexander Kusenko, a professor of physics at UCLA, emailed to inform him that it had to be wrong. A vehicle like that would break the laws of physics, Kusenko said.
He bet $10k and lost.

https://www.yahoo.com/news/youtuber-bet-physicist-10-000-120100405.html

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  #2  
Old 07-28-2021, 08:35 PM
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What an idiot. It is a bit mind bending at first glance but it's actually an incredible display of physics. I wonder if he has ever been on a sailboat.
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  #3  
Old 07-29-2021, 08:00 AM
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From the article.


"Created by Rick Cavallaro, a former aerospace engineer, Blackbird is unique because it can move directly downwind faster than the wind itself for a sustained period. Any sailor worth their salt can tell you that a boat can travel faster than the wind by cutting zigzag patterns; that's called tacking. But the idea that a vehicle can beat the breeze traveling straight downwind, no tacking involved, is controversial."


https://www.yahoo.com/news/youtuber-bet-physicist-10-000-120100405.html

Makes you wonder. How much money did he spend to win $10K?
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  #4  
Old 07-29-2021, 08:04 AM
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It does seem counterintuitive, but I'd never make such a bet without testing and such to be sure. Ten grand is a lot of money.
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  #5  
Old 07-29-2021, 08:13 AM
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Originally Posted by t walgamuth View Post
It does seem counterintuitive, but I'd never make such a bet without testing and such to be sure. Ten grand is a lot of money.
THIS coming from a guy who has a restored Studebaker Coupe Express AND a Cobra replica?
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  #6  
Old 07-29-2021, 09:28 AM
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Quote:
Originally Posted by Mike D View Post
THIS coming from a guy who has a restored Studebaker Coupe Express AND a Cobra replica?
I didn't get them by making foolish bets.
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  #7  
Old 07-29-2021, 03:07 PM
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A sailboat tacking on the wind I can understand. I listened to the explanation, I watched it happen, and it still sort of bends my head around. If they end up sailing de facto into a headwind why does the propeller keep behaving as though it has a tailwind?
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  #8  
Old 07-31-2021, 12:38 PM
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I buy this explanation.

Quote:
The secret to Blackbird, Cavallaro explained, is that once the wind gets the vehicle going, its wheels start to turn the propeller blades - they're connected to the blades by a chain. As the vehicle speeds up, its wheels turn the propeller faster and faster. The propeller blades, in turn, act as a fan, pushing more air behind the land yacht and thrusting it forward.
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  #9  
Old 08-02-2021, 01:10 PM
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Quote:
Originally Posted by cmac2012 View Post
A sailboat tacking on the wind I can understand. I listened to the explanation, I watched it happen, and it still sort of bends my head around. If they end up sailing de facto into a headwind why does the propeller keep behaving as though it has a tailwind?
Think of the prop as having 3 sailboat sails. The wheels are driven by that and actually provide the forward propulsion. I think everyon's first reaction is to think that it is a traditional propeller driven vehicle, when in this case the prop acutally is there to harness the wind and drive the wheels.
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  #10  
Old 08-02-2021, 04:23 PM
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Good explanation. Thanks TBO!
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  #11  
Old 08-02-2021, 07:22 PM
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Quote:
Originally Posted by Kuan View Post
I buy this explanation.
Quote:
Originally Posted by tbomachines View Post
Think of the prop as having 3 sailboat sails. The wheels are driven by that and actually provide the forward propulsion. I think everyon's first reaction is to think that it is a traditional propeller driven vehicle, when in this case the prop acutally is there to harness the wind and drive the wheels.
Ahhhhhhhhhh, we finally found the perpetual motion machine !
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  #12  
Old 08-02-2021, 10:34 PM
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Quote:
Originally Posted by INSIDIOUS View Post
Ahhhhhhhhhh, we finally found the perpetual motion machine !
Nope, just pressure and fluid dynamics. Super cool experiment/exposition.
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  #13  
Old 08-03-2021, 08:43 AM
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A perfect example of a guy having an idea and going for it. Perhaps one day this will lead to something really useful in addition to being really cool!
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  #14  
Old 08-05-2021, 01:01 AM
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Thumbs up Understanding Science

This is great ! .

Kudos to Mr. Cavallaro ! .

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