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☖ Forums → Discussion Forum → An airplane on a conveyor belt will take off.
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An airplane on a conveyor belt will take off.
2008-01-30, 12:26 PM #81
Nor will it hinder it.
nope.
2008-01-30, 1:01 PM #82
indeed
"Nulla tenaci invia est via"
2008-01-30, 1:02 PM #83
I suppose if the conveyor was going the same direction as the plane. And it was going at a considerable rate it could accelerate the lift process, but if the engines don't catch up in time the plane will not fly very long.
"Nulla tenaci invia est via"
2008-01-30, 1:22 PM #84
Originally posted by Z@NARDI:
I suppose if the conveyor was going the same direction as the plane. And it was going at a considerable rate it could accelerate the lift process, but if the engines don't catch up in time the plane will not fly very long.


No no no no no no.

It does not matter at all what the conveyor does EVER.
2008-01-30, 2:02 PM #85
sure it does.. if a plane is sitting on the conveyor it will move with the conveyor. If the conveyor is going 300MPH it will have an effect..

it's not like the plane just sits stationary while the conveyor moves beneath it....
"Nulla tenaci invia est via"
2008-01-30, 2:04 PM #86
In an ideal physics situation, that is exactly what would happen, yes. That's what inertia is. Objects in motion stay in motion, objects at rest STAY at rest.
Warhead[97]
2008-01-30, 2:12 PM #87
I would have thought that the faster the conveyer belt goes the more likely the plane is to remain in place.

The old pulling the table cloth trick comes to mind. If you move the tablecloth slowly, everything on it will move with it, move it suddenly and they'll stay still. This effect would be even more pronounced with an aircraft because it takes a hell of a lot of force to move something that heavy, it'd much rather stay where it is.
Detty. Professional Expert.
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2008-01-30, 3:08 PM #88
Originally posted by Detty:
I would have thought that the faster the conveyer belt goes the more likely the plane is to remain in place.


Yes, but instead of stay in place, you mean be unaffected. There is no change in momentum from the belt. There is a change in momentum from the engine's thrust which causes the plane to move forward.
2008-01-30, 3:12 PM #89
conveyor belts are designed to move large stationary objects, and they loop so there is no end to it (like there is an end to a table cloth).. yes if the conveyor instantly accelerated to 300MPH the plane would stand still for a moment (while the wheels moved) but it would eventually begin to move with the conveyor. Once the air-craft reached speeds the air traveling over the wings would create lift. But if the engines are not engaged the plane would start to decelerate because of the drag and then it would land back down on the conveyor.
"Nulla tenaci invia est via"
2008-01-30, 3:15 PM #90
You guys are totally missing the point of the question. You're looking too deep into it.
Warhead[97]
2008-01-30, 3:20 PM #91
Welcome to Massassi.
2008-01-30, 3:37 PM #92
What would :tfti: do?
2008-01-30, 4:07 PM #93
What time is the show on?
2008-01-30, 4:35 PM #94
9 PM EST
2008-01-30, 6:00 PM #95
It is on.
Wikissassi sucks.
2008-01-30, 6:03 PM #96
For some reason Dirty Jobs is still on for me..
2008-01-30, 6:16 PM #97
Oh look, it moved forward under prop power while the belt moved backwards.

...and then ran out of belt and crashed. :/
Wikissassi sucks.
2008-01-30, 6:23 PM #98
Argh, frustrates me that it isn't airing in Canada for some reason.
2008-01-30, 6:24 PM #99
MYTH BUSTED.

It took off, *****es.
Wikissassi sucks.
2008-01-30, 6:39 PM #100
Originally posted by Aglar:
Argh, frustrates me that it isn't airing in Canada for some reason.


Yeah, I like Mike Rowe and all but he needs to piss off so I can watch Mythbusters when its on.
Stuff
2008-01-30, 6:41 PM #101
I didn't get to see the show, but CM's toy plane with a string on a treadmill finally made sense to me. I was about to argue, "OH NO IT WON'T", but after a lot of beating, it makes sense.
"Harriet, sweet Harriet - hard-hearted harbinger of haggis."
2008-01-30, 6:58 PM #102
Now the full-size plane took off too.
Wikissassi sucks.
2008-01-30, 7:01 PM #103
It flew yay physics wins again!
whenever any form of government becomes destructive to securing the rights of the governed, it is the right of the people to alter or to abolish it
---Thomas jefferson, Declaration of Independance.
2008-01-30, 7:37 PM #104
Bwah..i watched it, it took off

First and foremost, I admit it, I was wrong. But just to make things clear, that does not mean I am stupid or need to take a physics class etc. I happen to enjoy the sciences very much. Science is my favorite subject, hands down. It was all in the perception of the forces at work here. It was not that people didn't understand that the plane was not driven by the wheels...The problem was in the perception of what effect the conveyor would have on the plane, thus the misconception. Might I point out that even the pilot in the show(who had several years of experience and is the one person who should know inside and out the forces at work on his plane) thought the plane would stay still. Once I saw these guys do a visual demonstration of what was really going on, it was clear as day.
2008-01-30, 8:25 PM #105
Originally posted by Chewbubba:
I didn't get to see the show, but CM's toy plane with a string on a treadmill finally made sense to me. I was about to argue, "OH NO IT WON'T", but after a lot of beating, it makes sense.


But you are a science teacher!
SnailIracing:n(500tpostshpereline)pants
-----------------------------@%
2008-01-30, 8:26 PM #106
I think you are all have missed one big error in your theories,

it is aeroplane not airplane.

/me runs off and hides.

;)
Snail racing: (500 posts per line)------@%
2008-01-30, 10:09 PM #107
Anybody who personally disbelieves the Mythbusters' outcome, I will ban. Your ticket to comeback will be satisfactory completion of high school physics.
Code to the left of him, code to the right of him, code in front of him compil'd and thundered. Programm'd at with shot and $SHELL. Boldly he typed and well. Into the jaws of C. Into the mouth of PERL. Debug'd the 0x258.
2008-01-30, 10:51 PM #108
Now, what happens when the plane tries to land on the still running conveyer belt?

o.0
2008-01-30, 10:55 PM #109
Assuming it's long enough to allow for the landing, everything should work as normal, unless I missed something. I'm tired and haven't put a lot of thought into it, but I see no reason why it should be different.
2008-01-30, 10:56 PM #110
I just disbelieve JediGandalf :P I think most people in here just needed to visualize it.
obviously you've never been able to harness the power of cleavage...

maeve
2008-01-30, 11:12 PM #111
Originally posted by Aglar:
Assuming it's long enough to allow for the landing, everything should work as normal, unless I missed something. I'm tired and haven't put a lot of thought into it, but I see no reason why it should be different.


Brakes are on the landing gear.
2008-01-31, 12:00 AM #112
Originally posted by Jon`C:
Brakes are on the landing gear.


Gah! Beat me to it. :colbert:
2008-01-31, 1:11 AM #113
It would need some very careful braking indeed. From the wheels' point of view, it would mean landing at double speed, without the effect of the extra lift that would be present if the speed actually was double. However, since a plane can land even with a missing wheel, I don't think it would necessarily be disastrous.
Frozen in the past by ICARUS
2008-01-31, 1:54 AM #114
Originally posted by Phoenix301:
But just to make things clear, that does not mean I am stupid or need to take a physics class etc.

No, it really does.

You're stupid.

Go take a physics class. [http://img508.imageshack.us/img508/7114/emotsciencebt7.gif]
Bassoon, n. A brazen instrument into which a fool blows out his brains.
2008-01-31, 2:20 AM #115
Drawing a very simple force diagram was all that was needed, phoenix. Perception of the forces involved is what the mechanics side of physics is all about!
2008-01-31, 3:10 AM #116
Originally posted by lassev:
I don't think it would necessarily be disastrous.



Giant object skidding across a gigantic rubber surface?

I'd love to see what the passengers would look like when they get out with that amount of static.

:P
nope.
2008-01-31, 3:11 AM #117
but when landing, planes use spoilers and reverse thrusters, the wheel brakes are only useful for taxiing, not actualy stopping the landing aircraft.
Snail racing: (500 posts per line)------@%
2008-01-31, 3:20 AM #118
I just pictures the plane going a little bit sideways, allowing the conveyer to apply some force. >_>

o.0
2008-01-31, 3:23 AM #119
also, i think the real question is, [insert witty snakes on a plane joke relating to conveyer belts here]?
Snail racing: (500 posts per line)------@%
2008-01-31, 4:15 AM #120
Right, wheel brakes only really help to stop the plane from rolling too far.
Bassoon, n. A brazen instrument into which a fool blows out his brains.
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