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Message
re: Myth Busters/Can a plane take off on a conveyor belt
Posted on 12/4/07 at 12:42 pm to Colonel Hapablap
Posted on 12/4/07 at 12:42 pm to Colonel Hapablap
quote:
But to post only on the OT is evidence of brain damage.
I'd say only posting on the Rant is worse. (Or only posting on the Coaching Changes board...)
Posted on 12/4/07 at 12:43 pm to Thomas Hudson
if the belt is going takeoff speed in the other direction it would be the same as the wheels not actually touching the ground.
its going to be interesting to see them do this though.
i did not feel like reading all the pages. so maybe this discussion is over.
its going to be interesting to see them do this though.
i did not feel like reading all the pages. so maybe this discussion is over.
This post was edited on 12/4/07 at 12:45 pm
Posted on 12/4/07 at 12:44 pm to LSUBoo
I didn't read the whole thread, so I don't know if anyone mentioned this (I'm sure out of all the geniuses on this board someone did), but it seems to me that the plane would not take off. If the conveyer belt is matching the plane's ground speed, the plane would be stationary in relation to the surrounding air. That means that the air pressure would remain the same on both sides of the wing.
Posted on 12/4/07 at 12:49 pm to boxcarbarney
quote:
I didn't read the whole thread, so I don't know if anyone mentioned this (I'm sure out of all the geniuses on this board someone did), but it seems to me that the plane would not take off. If the conveyer belt is matching the plane's ground speed, the plane would be stationary in relation to the surrounding air. That means that the air pressure would remain the same on both sides of the wing.
I suggest you read the thread... or at least the last 2 or 3 pages. You'll find that you're wrong, theoretically.
Posted on 12/4/07 at 12:49 pm to Colonel Hapablap
quote:Agreed.
A pure OTer? I have a hard time with that. Maybe someone who posts in a bunch of places including the OT. But to post only on the OT is evidence of brain damage.
I was merely trying to avoid an 80+% PoliWaterBoarder.
Posted on 12/4/07 at 12:50 pm to just me
quote:
PoliWaterBoarder.
Posted on 12/4/07 at 12:55 pm to LSUBoo
i read a couple of pages. why do so many people think that there would be no wind just because the plane is not moving?
did they finally get it later. maybe i should read more.
did they finally get it later. maybe i should read more.
Posted on 12/4/07 at 12:55 pm to noonan
read some more. You don't get it yet either.
Posted on 12/4/07 at 12:56 pm to noonan
quote:
did they finally get it later. maybe i should read more.
Skip to the last 3-4 pages, there are some good explanations of why it would, theoretically, take off.
Posted on 12/4/07 at 12:59 pm to Colonel Hapablap
quote:
that's stupid on it's face. One is a rotational velocity and the other is linear.
exactly.
Posted on 12/4/07 at 1:00 pm to Colonel Hapablap
quote:
read some more. You don't get it yet either.
i understand the plane will be moving forward whether it is on a conveyor belt or not. i just don't understand why there would be no wind in the wings if the plane were not moving.
Posted on 12/4/07 at 1:09 pm to noonan
quote:
i understand the plane will be moving forward whether it is on a conveyor belt or not. i just don't understand why there would be no wind in the wings if the plane were not moving.
You just answered your own question... the plane WILL be moving forwards according to the thrust of its jet engines, regardless of what the conveyor belt is doing. The two act independently, because due to the plane's tires, there is no direct link between the two. And once the plane is moving forward through the air, it will achieve proper life and take off.
It's just like when a plane is taking off on a regular runway, the wheels aren't pushing it forward, the jet engines are. The wheels are just to mostly eliminate friction, and then to land the plane.
Posted on 12/4/07 at 1:13 pm to LSUBoo
quote:
You just answered your own question... the plane WILL be moving forwards according to the thrust of its jet engines, regardless of what the conveyor belt is doing. The two act independently, because due to the plane's tires, there is no direct link between the two. And once the plane is moving forward through the air, it will achieve proper life and take off.
It's just like when a plane is taking off on a regular runway, the wheels aren't pushing it forward, the jet engines are. The wheels are just to mostly eliminate friction, and then to land the plane.
If the conveyer belt is making the plane stationary relative to the earth, then how is it moving forward through the air??
Posted on 12/4/07 at 1:16 pm to boxcarbarney
quote:
If the conveyer belt is making the plane stationary relative to the earth, then how is it moving forward through the air??
The conveyor belt is NOT making the plane stationary relative to the earth. It's just making the plane's wheels work double-time to keep up with the plane and conveyor moving opposite directions from each other.
If the plane is moving 100 MPH to the left, and the conveyor belt is moving 100 MPH to the right, the wheels will be spinning at 200 MPH radial velocity to keep up with the two forces.
Posted on 12/4/07 at 1:17 pm to LSUBoo
quote:
If the plane is moving 100 MPH to the left, and the conveyor belt is moving 100 MPH to the right, the wheels will be spinning at 200 MPH radial velocity to keep up with the two forces.
But the spinning of the wheels has nothing to do with the planes motion in relation to the earth and the surrounding air.
Posted on 12/4/07 at 1:19 pm to boxcarbarney
quote:
But the spinning of the wheels has nothing to do with the planes motion in relation to the earth and the surrounding air.
Exactly. And only the wheels of the plane are connected to the conveyor belt, so it also will have nothing to do with the plane's motion in relation to the earth and the surrounding air.
Posted on 12/4/07 at 1:20 pm to LSUBoo
quote:How can I apply this to my life?
And once the plane is moving forward through the air, it will achieve proper life and take off.
Posted on 12/4/07 at 1:20 pm to boxcarbarney
quote:
But the spinning of the wheels has nothing to do with the planes motion in relation to the earth and the surrounding air.
You got it, but I don't think you know it.
Posted on 12/4/07 at 1:22 pm to just me
quote:
How can I apply this to my life?
Mile-high club. Life isn't complete without joining. (And I'm not referring to the poster on here.)
Posted on 12/4/07 at 1:47 pm to ags01
quote:
You got it, but I don't think you know it.
I'm sorry, my mind is more geared towards the philosophical than it is the mechanical and physical, and I'm probably not looking at this problem the right way. But, if the plane is stationary, because the conveyer belt negates any forward motion, how do the wings get the appropriate air pressure to create lift?
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