Will it take off?

250,608 Views | 1027 Replies | Last: 17 yr ago by toucan82
Old Faithful
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I have a drinking problem
highwayman
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quote:
It flies. There are valid visualizations and formulaic proofs ALL OVER this thread. We've proved the system. We've proved the wording of the original question. We've proved the systematic interaction forces. And we've proved the existence of an EXTERNAL force from the jet's turbines.


just curious, but will the jet's turbines create lift by themselves despite air not moving over the wing?

quote:
Stand on a skateboard holding a 100-lb weight. Throw the weight in one direction. You move in the other. THAT is the response of the air going through the turbines. EXTERNAL FORCE. Wheels irrelevant.


I wouldn't move if I was on a conveyor going the opposite direction at the same speed


[This message has been edited by highwayman (edited 12/8/2006 12:49p).]
Dad-O-Lot
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highwayman
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Is the question, 'Can a jetplane take off from a stationary postition?', or 'Can a jetplane advance foward on a conveyor going in the opposite direction at teh same speed of the plane?'
NeuroticAg
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AG
I just finally got around to reading this one. I didn't read much beyond the first post, but here's my input. As the question is worded:
quote:
A plane is standing on a movable runway(something like a conveyor) As the plane moves, the conveyor moves but in the opposite direction. The conveyor has a system that tracks the speed of the plane and matches it exactly in the opposite direction.


I will make three assumptions:
1) When it says "plane speed", it means the speed of the actual plane through the air.

2) The conveyor will simply go fast enough to match the speed of the plane. No faster. In other words, not fast enough to utilize the friction of the wheels in order to keep the plane from going anywhere.

3) The wheels and conveyor will not break.

Using these assumptions, which I think are appropriate, the plane will fly. The wheels will have to turn twice as fast as they normally would, but that's not a big deal, as long as they don't break.

Now, if the question had been worded "the conveyor will go fast enough to prevent the plane from moving", then the plane will not take off as even the small amount of friction within the wheels will be enough to prevent take off given enough wheel speed.

that is all.
Guinea
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we came to that realization on page 7 i believe
NeuroticAg
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guinea, I'm sure, but I'm not going to read all of this, and I just wanted to give my opinion.
Guinea
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some research scientist you are. dont want to do any research. even when its sitting right in front of you! this is important stuff!!
IIIHorn
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ttt for Gina
NeuroticAg
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I don't need to do any research on this. I understand the basic principles of physics and am able to apply them to at least simple theoretical applications.

I don't care what the rest of you yahoos think.
IIIHorn
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ttt for Gina again
Tree Hugger
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AG
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traveler1
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i wonder what the percentage is of the number of people that posted on this thread that actually read it first. i bet it has to be very low.
SolidT05
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I read the whole thing.

I'm amazed at how many people think it won;t fly even after the proof that it flies was posted pages earlier.

And Kramer is the official moron of the thread.
Goose
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AG
It will NOT fly.
Tree Hugger
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But it should DIE!
Goose
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AG
It will NOT die.
IIIHorn
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ttt = CPR
IIIHorn
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* burp *
Dad-O-Lot
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AG
circle jerk

http://www.texags.com/main/forum.reply.asp?topic_id=765504&forum_id=30

[This message has been edited by Dad-O-Lot (edited 12/8/2006 1:23p).]
CDUB98
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AG
http://www.texags.com/main/forum.reply.asp?topic_id=765504&forum_id=30
IIIHorn
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Sweeeeeeeeeet!
IIIHorn
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ttt for Tree Hugger.
CDUB98
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AG
This thing is 17 pages here, and four more pages on the nerdery.
LagAg
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IIIHorn
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ttt for highwayman
tlepoC
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i changed my mind again...it will fly
SolidT05
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The plane flies. The Engines have to exert a little more force than normal to get up to flight speed because of the frictin caused by the conveyor belt, but the plane flies.

Any Aerospace engineers want to model a proof for us?

And Mechanical engineers, would you please post a good equation for modelling rolling friction in Airplane tires?
videoag98
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Caliber
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AG
I love this thread
tlepoC
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I don't think it will fly anymore, bluestank convinced me otherwise through his impenetrable arguments

[This message has been edited by CopeIt (edited 12/9/2006 5:51p).]
SolidT05
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Look! It's Flying!!!


----[]
----[]
>-{())))=>
----[]
----[]




________________________________
(OOOOOOOOOOOOOOOOOOOOOO)

[This message has been edited by SolidT05 (edited 12/9/2006 6:06p).]
Caliber
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AG


look, the forces ar unbalanced...it'll move!
SolidT05
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quote:

look, the forces ar unbalanced...it'll move!


But Brad, won't the conveyor belt just pull the plane backward as fast as it can move forward, so that it doesn't go anywhere {/typical texags poster}
512Ag
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AG
But what if there's a monkey flying the plane? Will he know how to use the controls? Just something to think about.
 
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