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(Jalopnik)   That's it, my brain's broken. Y'all figger it out. Man. I mean it. What a time we live in   (jalopnik.com) divider line
    More: Interesting, Wind, Wind power, Perpetual motion, Windmill, Wind turbine, recent video, Veritasium channel, famed El Mirage  
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2020 clicks; posted to STEM » on 10 Jun 2021 at 5:05 AM (10 days ago)   |   Favorite    |   share:  Share on Twitter share via Email Share on Facebook



23 Comments     (+0 »)
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2021-06-10 5:13:43 AM  
The physics are not that complicated, and its not perpetual motion to whichever brain dead mod decided to give it that tag
 
2021-06-10 5:16:00 AM  
Nah.  That one's easy in terms of things you have to do when solving dynamics problems in physics.

You want difficult.  Work out how an explosion in a cylinder in an internal combustion engine becomes a force accelerating a car forward given that at no point, none at all, is there ever an actual force accelerating the car forward until you get to the end of the whole thing.
 
2021-06-10 5:27:20 AM  
The actual video from the source was posted a week or so ago.
 
2021-06-10 7:15:06 AM  
Momentum how hoes it work??
 
2021-06-10 7:21:38 AM  
external-content.duckduckgo.comView Full Size
 
2021-06-10 7:27:33 AM  
Anyone else remember this exact story and car from like 20 year ago?

RealXavori: Work out how an explosion in a cylinder in an internal combustion engine becomes a force accelerating a car forward given that at no point, none at all, is there ever an actual force accelerating the car forward until you get to the end of the whole thing.


Mechanical differential equations are sadistic.
 
2021-06-10 8:30:36 AM  

lifeslammer: The physics are not that complicated, and its not perpetual motion to whichever brain dead mod decided to give it that tag


All of them?
 
2021-06-10 8:34:18 AM  
morbotron.comView Full Size
 
2021-06-10 8:50:53 AM  

Stibium: Anyone else remember this exact story and car from like 20 year ago?


Yeah. Year before last? Can't be bothered to look, but it seems like twenty years ago now.

/The physics math checks out, but our primitive brains can't handle it.
 
2021-06-10 8:51:33 AM  
Once the mechanics were explained in the article it seemed pretty easy to wrap my head around it
 
2021-06-10 8:54:20 AM  
 
2021-06-10 8:58:45 AM  

Stibium: Anyone else remember this exact story and car from like 20 year ago?

RealXavori: Work out how an explosion in a cylinder in an internal combustion engine becomes a force accelerating a car forward given that at no point, none at all, is there ever an actual force accelerating the car forward until you get to the end of the whole thing.

Mechanical differential equations are sadistic.


And 30 years and 40 years and 50 years.  I remember stories about desert racers exceeding wind speeds back in the 1950s.
 
2021-06-10 9:02:10 AM  

natazha: I remember stories about desert racers exceeding wind speeds back in the 1950s.



Directly down-wind?
 
2021-06-10 9:08:27 AM  

Fursecution: Article from 2010.


Much better article too.
 
2021-06-10 9:09:40 AM  
Discovery Channel - Wind Powered Vehicle
Youtube LjLPPInzSzI
 
2021-06-10 9:27:49 AM  

lifeslammer: The physics are not that complicated, and its not perpetual motion to whichever brain dead mod decided to give it that tag


Fark user imageView Full Size
 
2021-06-10 10:53:43 AM  
This Wind-Powered Car Goes Fast Enough To Break Physics
However you think this thing works, I promise it's weirder

Bradley BrownellGo fook your yourself with your carptastic headline bradley bullshiat, it don't break physics you yahoo ass clown.It demonstrates physics is some crazy complicated shiat and does some totally non intuitive seeming magic, if you don't really understand it.
 
2021-06-10 11:08:32 AM  

natazha: Stibium: Anyone else remember this exact story and car from like 20 year ago?

RealXavori: Work out how an explosion in a cylinder in an internal combustion engine becomes a force accelerating a car forward given that at no point, none at all, is there ever an actual force accelerating the car forward until you get to the end of the whole thing.

Mechanical differential equations are sadistic.

And 30 years and 40 years and 50 years.  I remember stories about desert racers exceeding wind speeds back in the 1950s.


I don't think anyone back then was doing it directly downwind. It's a different problem if the wind's at a slight angle and you can get a sideways force from your wheels (or ice skates),

In the past threads I've described a model system for showing that directly downwind is also possible. It only requires accepting two items:
- Energy can be extracted from the relative motion of wind blowing across the ground
- A vehicle with powered wheels can move at a speed not directly related to the wind speed (i.e. only affected by a drag force which can be overcome by applying more power and reduced through a more aerodynamic design).

If you accept both of those then it becomes a matter of engineering (not fundamental physics) to construct a vehicle like the one in the article which does it for real.
 
2021-06-10 11:11:32 AM  

Ivo Shandor: natazha: Stibium: Anyone else remember this exact story and car from like 20 year ago?

RealXavori: Work out how an explosion in a cylinder in an internal combustion engine becomes a force accelerating a car forward given that at no point, none at all, is there ever an actual force accelerating the car forward until you get to the end of the whole thing.

Mechanical differential equations are sadistic.

And 30 years and 40 years and 50 years.  I remember stories about desert racers exceeding wind speeds back in the 1950s.

I don't think anyone back then was doing it directly downwind. It's a different problem if the wind's at a slight angle and you can get a sideways force from your wheels (or ice skates),

In the past threads I've described a model system for showing that directly downwind is also possible. It only requires accepting two items:
- Energy can be extracted from the relative motion of wind blowing across the ground
- A vehicle with powered wheels can move at a speed not directly related to the wind speed (i.e. only affected by a drag force which can be overcome by applying more power and reduced through a more aerodynamic design).

If you accept both of those then it becomes a matter of engineering (not fundamental physics) to construct a vehicle like the one in the article which does it for real.


Exactly, it doesn't break physics, but it is some rather spiffy engineering voodoo.
;p
 
2021-06-10 1:31:57 PM  

RealXavori: Nah.  That one's easy in terms of things you have to do when solving dynamics problems in physics.

You want difficult.  Work out how an explosion in a cylinder in an internal combustion engine becomes a force accelerating a car forward given that at no point, none at all, is there ever an actual force accelerating the car forward until you get to the end of the whole thing.


Linear downward force becomes torque as the piston pushes on the crankshaft. That torque causes various bits to rotate until it reaches an axle. The weight of the car + the friction of the tire on the ground leads to a force opposing the rotation of the wheel and pushing the car forward.
 
2021-06-10 4:46:37 PM  
the prop is being used more akin to a gyrocopter, which is basically a rotary sail

once you're sailing, you just need to know how to high performance sail

https://en.m.wikipedia.org/wiki/High-p​erformance_sailing
 
2021-06-10 6:47:52 PM  

RealXavori: Nah.  That one's easy in terms of things you have to do when solving dynamics problems in physics.

You want difficult.  Work out how an explosion in a cylinder in an internal combustion engine becomes a force accelerating a car forward given that at no point, none at all, is there ever an actual force accelerating the car forward until you get to the end of the whole thing.



Its not an explosion in the chamber, its a "controlled" burn.
 
2021-06-11 11:35:59 AM  
I am not an engineer but I've wondered if putting a small scale wind turbine in the front of an electric car would generate enough electricity to recharge the battery, acting like an alternator in internal combustion car. If not a full recharge at least extend the range between recharges.
 
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