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-   -   The "Plane on a Treadmill" Question (http://cellar.org/showthread.php?t=12670)

Flint 12-07-2006 11:04 AM

No. The movement of air over the wings does it. No movement = no lift = it will not take off.

glatt 12-07-2006 11:05 AM

Quote:

Originally Posted by Flint
It's not already in the air, and it will never get there from a staionary position. The engines DO NOT "push" the plane into the air.

The engines push the plane through the air until lift is achieved. When a plane taxis on a runway, it uses its engines pushing against the air to make it move. The wheels just follow the plane along.

Flint 12-07-2006 11:08 AM

Quote:

Originally Posted by Undertoad
The plane will move forward but not enough to gain enough lift.

Quote:

Originally Posted by glatt
Of course there is lift. The plane will move forward against the air, and twice as fast against the runway.

No, read the question:
Quote:

Originally Posted by Kitsune
When the plane's engines throttle up, it begins to move forward, but the treadmill is made to match the forward speed of the plane, only in the opposite direction. So, as the plane moves forward, it moves backwards beneath the aircraft.

The plane cannot move against the air, at all.

Flint 12-07-2006 11:09 AM

Quote:

Originally Posted by glatt
The wheels just follow the plane along.

Forget the wheels. The plane needs to move against the air to generate lift, to take off. It can't move against the air, so it can't take off.

Undertoad 12-07-2006 11:10 AM

OK, OK I'm convinced.

Which makes me a worse job candidate, except that I have the ideal answer to all such interview questions:

Oh, I've already heard that one.

That is, unless you want to use a constructed answer. The answer to why manholes are round? Because men are round. Duh.

"What would you do for a Klondike bar?"
I'm sorry, but I can't discuss salary during a first interview.

Spexxvet 12-07-2006 11:10 AM

Sure, all it would need is a wind blowing at the front of the plane, that is strong enough to create lift.

Flint 12-07-2006 11:12 AM

Spexxvet "gets it"
 
Quote:

Originally Posted by Spexxvet
Sure, all it would need is a wind blowing at the front of the plane, that is strong enough to create lift.


glatt 12-07-2006 11:13 AM

The plane pushes against the air, right?

Picture a different scene. You are in a canoe in a raging river, but you have a pole, and you are using it to push your way up the river. The water is going past the canoe at a very high speed, but since you aren't pushing against the water, this doesn't matter. You push against the ground with a pole.

Here, the plane isn't pushing against the runway, it's pushing against the air. The runway doesn't matter.

Spexxvet 12-07-2006 11:15 AM

It would not take off.

Quote:

the treadmill is made to match the forward speed of the plane
not the speed that the tries rotate. The plane will not move forward, cannot take off.

Flint 12-07-2006 11:17 AM

Quote:

Originally Posted by glatt
Picture a different scene.

No, picture the scene we're talking about: a plane hopping right into the air, straight off the ground. (Commercial jetliners are not designed to do this!) And then say to yourself "oh, gee, what an incredible dumbass I was for even entertaining the fact that this might be possible" . . .

Quote:

Originally Posted by glatt
Here, the plane isn't pushing against the runway, it's pushing against the air. The runway doesn't matter.

And the "pushing" doesn't matter, either. Only the forward motion does. There is no forward motion according to the question.

glatt 12-07-2006 11:20 AM

You're messing with me now, aren't you? You know it takes off, but you are playing devil's advocate just to keep the argument going.

Flint 12-07-2006 11:22 AM

IM ON UR RUNWAY SPINNIN UR TIREZ

glatt 12-07-2006 11:22 AM

Quote:

Originally Posted by Flint
There is no forward motion according to the question.

The question doesn't say that.;)

Undertoad 12-07-2006 11:23 AM

http://cellar.org/2006/ITTAKESOFF.gif

:D

barefoot serpent 12-07-2006 11:23 AM

ok... the pilot 'spins' up the runway to about 150 mph, quickly turns around 180 deg. and 'rides' the runway with enough speed for lift!


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