[Video] Plane On Treadmill Problem solved by Mythbusters... or is it not?

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Kenza

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Nov 22, 2005
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Kinda funny tho, the dark spots in the pic that supposedly shows that the "threadmill" isnt moving looks like shadows from the cones to me
 

Mr.Russian

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May 23, 2006
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Kinda funny tho, the dark spots in the pic that supposedly shows that the "threadmill" isnt moving looks like shadows from the cones to me

Well, they also look like ripples on tarpaulin.

+ shadows from the plane, from the car and from the cones don't match.
 
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REZ

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Nov 21, 2005
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That experiment the Mythbusters ran doesnt even come close to replicating the original question.. their expensive experiment was a waste of time.

Whether or not the plane can build up enough air around its wings to actually take off depends entirely on the type of equipment used.. but if everything is magical, and the plane has an infinite thrust threshold, then of course.. it would overpower the friction variable in the wheels, bearings and weight of the plane. It isnt that difficult to imagine.
 

Kenza

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Well, they also look like ripples on tarpaulin.

+ shadows from the plane, from the car and from the cones don't match.
they do! the sun is pretty low casting long shadows from left to right and the dark spots has the same spacings as the cones
 

fiftyone

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May 6, 2006
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I thought I gave you all the answer the last time !
Oh well, back to me skateboard :D
 

Mr.Russian

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May 23, 2006
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they do! the sun is pretty low casting long shadows from left to right...

shadow_truck_6min_43sec.jpg
shadow_plane_6min_47sec.jpg
 

Mr.Russian

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May 23, 2006
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the last pic even prove my point if you look closely

But what about point 1: "tarpaulin is not moving, because otherwise it would rip under 500 lb plane".

It ripped under the weight of just one person. They showed it multiple times.
 

Kenza

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Nov 22, 2005
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dunno tbh, but it could be as simple as the wheels are rolling as opposed to one guy running on it. besides what would they gain from trying to fake it? and then there is that shot in the video (around 1:57) that really shows the plane and the tarpaulin moving
 

Mr.Russian

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May 23, 2006
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dunno tbh, but it could be as simple as the wheels are rolling as opposed to one guy running on it. besides what would they gain from trying to fake it? and then there is that shot in the video (around 1:57) that really shows the plane and the tarpaulin moving

Probably they've already used all their program budget when they realized their experiment wasn't working.

And there is nothing at 1:57 showing the plane and tarpaulin moving.
 

LogisticEarth

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I know this is likely to cause this thread to self destruct, but can someone explain to me why the plane would NOT take off?

On the plane the force is applied to two points, the engine (pulling the plane forward) and the friction between the wheels and the conveyor belt. The belt pulls the wheels back, while the engine pulls the plane forward. The engine would simply have to overcome the friction in the wheel bearings to move the plane forward to takeoff speed relative to the non-moving air mass (which with the wings provides the lift). This should be easy, and the plane should take off.

What am I missing here?
 

Xendance

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Nov 21, 2005
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I know this is likely to cause this thread to self destruct, but can someone explain to me why the plane would NOT take off?

On the plane the force is applied to two points, the engine (pulling the plane forward) and the friction between the wheels and the conveyor belt. The belt pulls the wheels back, while the engine pulls the plane forward. The engine would simply have to overcome the friction in the wheel bearings to move the plane forward to takeoff speed relative to the non-moving air mass (which with the wings provides the lift). This should be easy, and the plane should take off.

What am I missing here?

It's not you. It's just that some people don't get the idea of "free rolling wheels".