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How smart is /b/ ? Given: A fully loaded Boeing 747 needs to

The stories and information posted here are artistic works of fiction and falsehood.
Only a fool would take anything posted here as fact.

Thread replies: 32
Thread images: 2

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How smart is /b/ ?

Given: A fully loaded Boeing 747 needs to reach 180 kts for lift off.

Problem: If we can make a treadmill move at 180 kts or more, will the plane lift off?
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No.
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>>646597299
no
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>>646597299
No where is the airflow?
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Yes, because bush did 9/11 using treadmills
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>>646597299
yes, if it lifts off at 180, then it would in effect be going that fast even though it is actually stationary.
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Mythbusters it works.
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Yes it will, because the plane will practically run at 180 kts relative to the ground. Special Relativity. Good look finding a treadmill that can support this kind of weight you faggot.
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Yes. If I inject marijuanas, the hallucinations become real.
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>>646597299
OP, that's a 737 in your pic, it only needs 140 kts for liftoff.

Trick question right?
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No air is rushing past wings therefore there would be no pressure difference to generate lift.
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watch fucking myth busters. You cant.
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Is the treadmill moving at that speed itself while carrying the jet?(possibly?) or is the track simulating that speed?(No?) the questions....
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Mythbusters did this faggots. It will lift off because the wheels are not supplying power, the turbines attached to the wings are.
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>>646597886
Nope

A-319, look at the wingtips
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If spinning wheels fast was all you needed to fly, all cars would fly and planes would not need wings. So no.
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>>646597512 is correct.

It's not the airplane moving fast that gives it life (or the wheels spinning fact), it's air flowing over the wings.

In your example, there is no air flowing over the wings, therefore no lift.
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>>646597299
Once again, for the newfriend. 180kts, air speed, not ground speed you fucktard. In order for an aircraft to achieve lift, air must travel across the wing, whereby it moves slower as it travels over the top of the wing than underneath it, creating a differential of air pressure, thereby creating lift. A treadmill running the wheels at 180kts will not move the necessary wind speed over the wings to allow it to lift off the ground Duh. Don't be such an autist

>inb4 this is bait
Some dumbass is going to believe this shit.
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https://www.youtube.com/watch?v=YORCk1BN7QY
jk you can
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>>646597299
It would because the wheels aren't what's moving it. It's the jets. It would move right off the treadmill, the wheels spinning twice as fast as normal.
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>>646597299
Yes, but only if the treadmill was facing into a 180 knot headwind, otherwise no.
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>>646598365
dafuq does wind have to do with it?
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>>646598365
Not sure if srs, it needs speed not wind
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>>646598259
If it's moving at 180kts, that means air is going over the wings at 180kts. So yes, it will liftoff.

>>646598365
Wrong
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>>646598323
the problem is the plane is moving. if it stayed still, nothing would happen because there is no lift
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File: 1443919295617.jpg (56KB, 480x480px) Image search: [iqdb] [SauceNao] [Google]
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>>646597299
YOu dumb shit you forgot to mention if the engine was on and giving thrust or whatever the fuck it is
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>>646598581
>>646598706
It needs enough airflow over the wings to generate enough lift for it to fly.

You can slow a small plane down enough to have a ZERO forward speed (staying stationary over the same spot on the ground) when flying into a strong enough headwind.
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>>646597299
No, the wheels will spin.
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forward momentum is from the jets not the wheels the treadmill will be meaningless . if the treadmill was long enough the plane would take off
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>>646599079
>You can slow a small plane down enough to have a ZERO forward speed (staying stationary over the same spot on the ground)

I'm calling bullshit on this one. It would fall out of the sky if you did that.
>>
>>646598860

The point the video makes, is that the propeller/jet turbine move the plane independently of the wheels. A plane will always move forward on a conveyor belt running in the opposite direction, because the wheels just spin freely, they don't provide the forward thrust.
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What's the difference between your car and a plane? A plane has wings. Your car doesn't. What typically causes a vehicle to leave flat ground? Lift. Wings cause lift. Your car doesn't have wings. A plane does. What makes wings create lift? It's wind resistance that pushes the plane up. A treadmill moves the ground underneath, but NOT the air above the ground. Wings NOT moving against wind cannot create lift. This means the fundamental feature, lift, the ONLY meaningful difference between a plane and your car is removed. Trying to get the PLANE to fly on a treadmill is identical to trying to get your CAR to fly on a treadmill. Of COURSE we can't get your car on a treadmill to fly, it has no lift. Of COURSE we can't get a plane on a treadmill to fly, it has no lift. You may as well take giant jacks, raise the plane off the runway, spin the tires, deactivate the propeller, and try to take off. On a treadmill, that's almost exactly what it's doing. The answer to this is obviously, no, a treadmilling plane cannot take off.
Thread posts: 32
Thread images: 2



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