A question...

[3.4 slow to go]

^^^^ (Mogobs) that makes too much sense and therefore must be wrong.

[BLLDOGG]

Originally posted by asdf1234:
</font><blockquote>quote:</font><hr />Originally posted by airfrmr:
I don't know about Matt, but that scares the **** out of me.
It shouldn't. I understand what he is getting at. Just not how an airplane sitting on a stationary treadmill is still moving forward, and I'm sure I'm not the only one.

Well, as long as you're not designing the airplanes [img]smile.gif[/img]

Hopefully my last post makes some sense of it. </font>[/QUOTE]you always hear of plane crashes because of mechanics and maintanance failure

[BLLDOGG]

Originally posted by Mogobs30th:
</font><blockquote>quote:</font><hr />As the plane moves the treadmill moves but in the opposite direction. The treadmill has a system that tracks the speed of the plane and matches it exactly in the opposite direction

What the wheels are doing doesn't matter. The treadmill is counteracting the speed of the plane, NOT THE SPEED OF THE WHEELS. From the ground, the wheels AND the plane are both moving at the same speed, whether or not a treadmill is under it or not. The whole reason why the plane CANNOT take off is because the treadmill is counteracting the speed of the plane, and not the wheels, hence the plane is not moving at all, hence it cannot take off because of the lack of airflow over the flap, aileron, and droop (depending on the size of the plane is whether or not it has droop capabilities).

In order for the plane to take off, it must outrun the speed of the treadmill THROUGH the wheels. But it cannot because the planes speed is being counteracted by the treadmill THROUGH the wheels, regardless how fast the wheels are spinning. </font>[/QUOTE]Mogobs30th agrees with me. This conversation is OVER!

[asdf1234]

Originally posted by BLLDOGG:
</font><blockquote>quote:</font><hr />Originally posted by asdf1234:
</font><blockquote>quote:</font><hr />Originally posted by airfrmr:
I don't know about Matt, but that scares the **** out of me.
It shouldn't. I understand what he is getting at. Just not how an airplane sitting on a stationary treadmill is still moving forward, and I'm sure I'm not the only one.

Well, as long as you're not designing the airplanes [img]smile.gif[/img]

Hopefully my last post makes some sense of it. </font>[/QUOTE]you always hear of plane crashes because of mechanics and maintanance failure </font>[/QUOTE]Excellent point. Okay so I'm still scared.

[airfrmr]

No, I'm not designing, just fixing. I understand the whole thing about how an airplane works...it is either pushed or pulled through the air and that, depending on the plane, may need to travel roughly 100 mph or more to have enough wind speed to create lift on the wings. Which tells my uneducated mind that it will not move forward or gain flight on a treadmill.

[98Camaro3.8]

Ok, so you tell me...

The engine is making, say 1,000 lbs of thrust. How is the treadmill causing 1,000 lbs of drag on the airplane? The forces must be equal for the plane to stay still.

[3.4 slow to go]

end of discussionj, the plane hasn't even gone as far as this thread.

I therefore provclaim the plane to be of PEIDMONT origin.

[vroom-chirp]

if the tread mill is the runway...then how long is the runway?

[3.4 slow to go]

Originally posted by 98Camaro3.8:
Ok, so you tell me...

The engine is making, say 1,000 lbs of thrust. How is the treadmill causing 1,000 lbs of drag on the airplane? The forces must be equal for the plane to stay still.

it is because it states it in the question.

The treadmill has a system that tracks the speed of the plane and matches it exactly in the opposite direction.

[98Camaro3.8]

Originally posted by 3.4 slow to go:
it is because it states it in the question.

But that doesn't explain how you're getting that much drag. The wheels are rolling...how are you going to get that much drag on the wheels? That just tells me the wheels are turning twice as fast (they are).

[asdf1234]

Originally posted by 3.4 slow to go:
</font><blockquote>quote:</font><hr />Originally posted by 98Camaro3.8:
Ok, so you tell me...

The engine is making, say 1,000 lbs of thrust. How is the treadmill causing 1,000 lbs of drag on the airplane? The forces must be equal for the plane to stay still.

it is because it states it in the question.

The treadmill has a system that tracks the speed of the plane and matches it exactly in the opposite direction. </font>[/QUOTE]It matches the planes speed, not the wheels speed, and even matching the wheels speed wouldn't be relevant.

Say the plane is moving forward at 10mph, then the treadmill would be moving backwards at 10mph, but the wheels would be traveling at 20mph. Therefor the plane would still be moving 10mph forward, and the backwards motion of the treadmill has nothing to do with it.

[3.4 slow to go]

wtf are you talking about? the plane is just going to sit there w/it's wheels spinning, no matter how much thrust is used, as the treadmill will go that much faster to keep the wheels in place

[vroom-chirp]

aircraft engine= 1000lbs of thrust
tread mill= 900mph
we're still not going any where...

[asdf1234]

Originally posted by 3.4 slow to go:
wtf are you talking about? the plane is just going to sit there w/it's wheels spinning, no matter how much thrust is used, as the treadmill will go that much faster to keep the wheels in place

The thrust isn't coming from the wheels, its coming from the prop. The wheels are not doing anything that affects the plane from moving. They're spinning, yes, but as the prop pulls the plane the wheels will just spin faster, why would a spinning wheel stop the plane from traveling?

[BLLDOGG]

well, until the plane is air born, the plane needs the wheel for movement. so if the plane moves forward 1mph, the treadmill is moving backwards instantaniously 1mph which would cuase no movement.