Aeroplane on a treadmill...?

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Garry.Crabtree
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Re: Aeroplane on a treadmill...?

Post by Garry.Crabtree »

Didn't Mythbusters confirm that a plane cannot take off it moving at the same speed?
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Re: Aeroplane on a treadmill...?

Post by Username Taken »

Garry.Crabtree wrote:Didn't Mythbusters confirm that a plane cannot take off it moving at the same speed?
Mythbusters had a 747 on a giant treadmill????? :shock:
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terrifiedanimal
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Re: Aeroplane on a treadmill...?

Post by terrifiedanimal »

Plane takes off like it normally would. It's not like the plane uses a drive to the wheels to obtain forward speed, so however fast the wheels are turning is irrelevant.
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Re: Aeroplane on a treadmill...?

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Ttr
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Re: Aeroplane on a treadmill...?

Post by Ttr »

OrangeDragon wrote:Without looking it up and cheating... what do you think would happen it a 747 on a giant treadmill that would go backwards as fast as the plane would move forwards were to try and take off?

And why?
  • Eventually the uplift would force the plane to lift vertically off the conveyer belt.
  • However as there is no forward motion the plane would perform a backflip landing upside down on the conveyer belt.
  • At this point its engines would be driving it backwards in relation to the conveyer belt.
  • I guess it would then fall off the back-end of the conveyer belt.
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StroppyChops
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Re: Aeroplane on a treadmill...?

Post by StroppyChops »

There would be no uplift until the plane is moving forward - however the question is academic (cannot be positively answered).
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Re: Aeroplane on a treadmill...?

Post by General Mackevili »

StroppyChops wrote: - however the question is academic (cannot be positively answered).
Can't we try this? Maybe wait 10 years until treadmills back in the States ARE as big as a 747.
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Re: Aeroplane on a treadmill...?

Post by Garry.Crabtree »

General Mackevili wrote: Can't we try this? Maybe wait 10 years until treadmills back in the States ARE as big as a 747.
Or as they call them in America, "Weapon of Ass Reduction"
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Post by General Mackevili »

Maybe we could convert one of these into a treadmill for a 747:

Image
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IraHayes
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Re: Aeroplane on a treadmill...?

Post by IraHayes »

Lift is caused by airflow over the wing. Therefore in a controlled environment (where the plane cannot move forward) there would be no lift as there would be no airflow over the wing.
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