Mythbusters plan to uncover plane on conveyor belt

111,186 Views | 2087 Replies | Last: 5 yr ago by toucan82
HotardAg07
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11:38a, 10/25/07
AG
Unless the plane is moving the same speed relative to the conveyor belt as the conveyor belt is moving relative to the ground, the plane is moving.
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IIIHorn
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11:38a, 10/25/07
quote:
Umm...it is being held in place - just like I get held in place by a treadmill.


( ... snicker ... )
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Husky Boy Jr.
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11:39a, 10/25/07
AG
Did anyone calculate in the earth's rotation?
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IIIHorn
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11:39a, 10/25/07
Yes someone has.
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gambochaman
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11:41a, 10/25/07
AG
i still dont see it

but oh well

i guess i'll have to watch the episode to have a better understanding
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IIIHorn
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11:42a, 10/25/07
Gambo,

Have you seen a wheel?
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Flaith
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11:42a, 10/25/07
AG
there is a youtube video in this thread in which an 8 YEAR OLD CHILD EXPLAINS IT AND PROVES IT
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Husky Boy Jr.
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11:42a, 10/25/07
AG
It doesn't matter what the episode says b/c these smart-guys already have it figured out...
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gambochaman
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11:42a, 10/25/07
AG
yes i have

but i feel to crappy right now to sit down and focus on this so i just choose to be an ignoramus
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IIIHorn
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11:43a, 10/25/07
quote:
It doesn't matter what the episode says b/c these smart-guys already have it figured out...



Exactly ... it is elementary physics.
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HotardAg07
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11:43a, 10/25/07
AG
Brian/gambo...

quote:
What you have to understand is that the plane will be moving ... there will be airflow around the wings. The wheels do not propel the plane at all, they are supposed to be as closed to frictionless as possible. All the conveyor does is spin the wheels, but that will not move the plane.

What moves the plane are the engines. The engines provide a net force forward. In an ideal world, there is NO force backward (edit: other than drag), even if the conveyor is moving 91832409832 mph backward, because the wheels are frictionless.

Therefore, the thrust forward by the engines propels the plane forward the same regardless of whether the plane is on stationary ground or a conveyor moving 2039840823904832098423094823094823094823 mph, and the plane can takeoff normally.

However, in the problem statement there is something incorrect. If the conveyor was truly moving the same speed as the radius of the wheels times the rotational velocity of the wheels in a no-slip condition, then the plane COULD NOT BE MOVING FORWARD. The thing is, this is only possible if the net force on the plane is zero. If there is any net force on the plane, the wheels will be moving faster or slower than the conveyor. THIS is what makes this problem so retarded.
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IIIHorn
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11:44a, 10/25/07
Gambo,

Hope you get to feeling better.
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CDUB98
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11:44a, 10/25/07
AG
gambo, I'll explain it tonight at happy hour
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IIIHorn
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11:46a, 10/25/07
Buy Gambo a beer, CDUB.
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Fenrir
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11:47a, 10/25/07
Will people just shut up about the mfing conveyor belt, please?
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CDUB98
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11:48a, 10/25/07
AG
I don't buy beer for brown people.
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IIIHorn
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11:48a, 10/25/07
The conveyor is moot!
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gambochaman
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11:48a, 10/25/07
AG
quote:
because the wheels are frictionless.


thats the point of information i was missing

i get it now
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NeuroticAg
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11:48a, 10/25/07
AG
If you put a beer on a conveyor-top bar, would it travel to the other end of the bar?


and would someone catch it before it fell off?
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IIIHorn
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11:49a, 10/25/07
Actually the wheels don't even have to be frictionless.
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NeuroticAg
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11:49a, 10/25/07
AG
stupid dp.

[This message has been edited by NeuroticAg (edited 10/25/2007 10:49a).]
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IIIHorn
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11:50a, 10/25/07
I double posted?
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Husky Boy Jr.
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11:51a, 10/25/07
AG
I believe this guy:



Over some 8 year old.
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TexasRebel
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11:51a, 10/25/07
AG
Holy Carp...

i sleep in and ya'll start over?

quote:
the plane uses its engines to combust the air and force it backwards


classic! I didn't know we could combust air
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CDUB98
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11:52a, 10/25/07
AG
Brian, either you are trolling big time, or you really are a dumbass.
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HotardAg07
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11:52a, 10/25/07
AG
But it is key to understand that the wheels are not free-spinning... that their only intention is to be as low in friction as possible so that the engines don't have to do any extra work helping the plane takeoff.
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gambochaman
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11:53a, 10/25/07
AG
brian they r right

i just wasnt thinking in airplane terms

the wheels dont matter because they are spinning on a "frictionless" axle

the plane is is propelled by the engine itself so it will be moving forward, therefore there will be wind speed which will cause lift
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gambochaman
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11:54a, 10/25/07
AG
the wheels are just the medium through which the plane translates while on the ground
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MonkeyKnifeFighter
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11:54a, 10/25/07
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CDUB98
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11:54a, 10/25/07
AG
Hotard, your love for the conveyor will die with your love for Fran on T+2.
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IIIHorn
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11:55a, 10/25/07
They would only have to be wheels typical of any normally functioning airplane. No more, no less.
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Husky Boy Jr.
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11:55a, 10/25/07
AG
I have never heard of a frictionless wheel but whatever.

I love these engineers and their theoretical worlds.

[This message has been edited by Brian2003 (edited 10/25/2007 10:56a).]
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gambochaman
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11:56a, 10/25/07
AG
sorry mKf

it took me a while to figure out because of this effing funk i am in...

i was thinking in car terms where the wheels actually propel the car
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gambochaman
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11:56a, 10/25/07
AG
brian the wheel is not frictionless with respect to the ground

it is near frictionless with respect to the airplane
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Flaith
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11:57a, 10/25/07
AG
DING DING DING


Oh and TexasRebel... ead.. care to rattle off standard combustable air-fuel ratios? its not important to go in to specifics... i just wanted to give an idea
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