Korean Job Discussion Forums

[SuperFly]

A plane is on a runway.
Except the runway is a conveyor belt.
The conveyor belt is infinitely long.
The conveyor belt is spinning at a speed equal to whatever speed the plane would be moving forward if the conveyor belt were not there.
The conveyor belt is spinning backwards. (The plane is trying to move forwards.)
The plane's engines have infinite thrust/power, and the plane has infinite structural integrity.
The plane is on wheels which work properly.
There is no wind, and there are no forces acting on the plane besides the friction between the wheels and the conveyor belt, and the engines.
There is no time limit.
Can the plane take off?

[eamo]

Noooo! Not this again!!!

We did this about two years ago. Boiled a lot of brains. Be good to have another go though. Let the new guys go nuts.

[Underwaterbob]

[adeline]

dude? you can't have friction without gravity and this also wouldn't even work without air and air pressure. i don't think the premise can even work without adding more forces, cause otherwise the plane would be floating off into the ether, is that taking off?

[SuperFly]

L=pn X kdA

where:
L is the Lift,
A is the wing surface area
p is the value of the pressure,
n is the normal unit vector pointing into the wing
k is the vertical unit vector, normal to the freestream direction

The above lift equation neglects the Skin friction forces, which typically have a negligible contribution to the lift compared to the pressure forces. By using the streamwise vector parallel to the freestream in place of in the integral, we obtain an expression for the Pressure Drag Dp (which includes Induced Drag in a 3D wing). If we use the spanwise vector , we obtain the Sideforce Y.

If there is no wind and no other forces other than the friction of the wheels, then the P value in the equation will = zero, causing the equation to = ZERO lift.

[Underwaterbob]

[ernie]

no wind = no air pressure = no lift.

<end of thread>

[RACETRAITOR]

I think an infinitely long conveyor belt would be weaker than a much shorter conveyor belt, and eventually the great stresses caused by its length would cause it to snap somewhere along the way, then the plane would race away and take off.

[Bibbitybop]

What if the plane has engines that can propel the plane upwards, like in True Lies?

[pkang0202]

What if the plane were gripped by the husk?

[ultra]

What if Chuck Norris exhaled onto the leading edge of the wings?

[Faunaki]

You were missed SuperF.

[johndoe]

[johndoe]

[johndoe]