Will the plane takeoff?

[H2 rocks me]

A plane is standing on a runway that can move (like a giant conveyor
belt). This conveyor has a control system that tracks the plane's
speed and tunes the speed of the conveyor to be exactly the same (but
in the opposite direction) instantly.

Will the plane be able to take off?

[dеiтайожни]

Yes.

[KenP]

No. The plane is "standing".

Or:

No. The plane isn't moving.

[PARAGON]

Depends on the plane.

The tires might blow due to the speed.

[PARAGON]

Originally Posted by KenP

No. The plane is "standing".

Or:

No. The plane isn't moving.

be able to

[BlueTJCO]

it would take off. just think physics, F=m*a. The forward force (from the thrust) in both case is always bigger than the backward force (due to the friction of the wheel and ground, and it's very small compare to the thrust force), therefore the net force is always forward. So the plane will accelerate forward in both cases and take off.


Next Please

[BlueTJCO]

Originally Posted by PARAGON

Depends on the plane.

The tires might blow due to the speed.

Thats the correct answer. At 500mph the tires would blow for sure... Aircrafts average take off speed is 120 MPH I think.......

[Mrs.ssippi]

Blue? No, no the answer is yellow. Yes, yellow and that is my final answer. Wait, can I use my phone a friend?

[CO Hummer]

How do you figure the plane can take off when there is no wind moving over the wings to create lift? Can't happen.

[BlueTJCO]

Originally Posted by CO Hummer

How do you figure the plane can take off when there is no wind moving over the wings to create lift? Can't happen.

what do you want to bet?

J/K..........Damn, this question gave me a headache like 3 years ago when it originally popped up on the internet........

[DennisAJC]

Originally Posted by CO Hummer

How do you figure the plane can take off when there is no wind moving over the wings to create lift? Can't happen.

X2 Unless it's a Harrier.

[Adam in CO]

Atlanta, Georgia.

[Wisha Haddan H3]

Yes for self-propelled airplanes but No for gliders towed behind ground vehicles.

In self-propelled airplanes thrust is delivered from the props or jets directly to the air, not to the ground. Since no forward thrust is delivered through the wheels, the conveyor will remain stationary. In fact, the conveyor may even move forward slightly with the plane depending on the amount of friction from the axles and the tire's contact patch. As the plane moves forward through the air, relative airspeed increases, lift is generated on the wings and the plane takes off.

With gliders, thrust is provided by a tow vehicle. If the tow vehicle is a truck on the conveyor, it would deliver its thrust through the wheels to the conveyor. Forward movement would be negated by the conveyor's movement, resulting in zero forward motion. The truck could be going 100 mph (relative to the conveyor) but its airspeed and groundspeed (next to the conveyor) would still be 0. No air would pass over the glider's wings and no lift would be generated for takeoff.

[Mrs.ssippi]

Originally Posted by Adam in CO

Atlanta, Georgia.

That is not the answer it is yellow!!!!!!!!!!!!!!!

[PARAGON]

Originally Posted by Wisha Haddan H3

Yes for self-propelled airplanes but No for gliders towed behind ground vehicles.

In self-propelled airplanes thrust is delivered from the props or jets directly to the air, not to the ground. Since no forward thrust is delivered through the wheels, the conveyor will remain stationary. In fact, the conveyor may even move forward slightly with the plane depending on the amount of friction from the axles and the tire's contact patch. As the plane moves forward through the air, relative airspeed increases, lift is generated on the wings and the plane takes off.

With gliders, thrust is provided by a tow vehicle. If the tow vehicle is a truck on the conveyor, it would deliver its thrust through the wheels to the conveyor. Forward movement would be negated by the conveyor's movement, resulting in zero forward motion. The truck could be going 100 mph (relative to the conveyor) but its airspeed and groundspeed (next to the conveyor) would still be 0. No air would pass over the glider's wings and no lift would be generated for takeoff.

Nope

keep trying

[CO Hummer]

Originally Posted by Mrs.ssippi

That is not the answer it is yellow!!!!!!!!!!!!!!!

Yellow is always a good answer.

[Adam in CO]

Four?

[h2co-pilot]

Originally Posted by CO Hummer

How do you figure the plane can take off when there is no wind moving over the wings to create lift? Can't happen.

X2

[Wisha Haddan H3]

Originally Posted by CO Hummer

How do you figure the plane can take off when there is no wind moving over the wings to create lift? Can't happen.

True that a plane can't take off w/o airflow over the wings to generate lift.

So the underlying question is ... "can a plane generate forward motion (into the wind) on a runway that moves in the opposite direction?"

A car could not, because it generates forward motion by transferring energy to the ground, which would be negated by the conveyor's opposite motion. But a self-propelled plane could still move forward, because it accelerates by pushing the air, irrespective of ground speed or conveyor direction.

[CO Hummer]

Originally Posted by Wisha Haddan H3

But a self-propelled plane could still move forward, because it moves forward by pushing the air, irrespective of ground speed or conveyor direction.

Doesn't the conveyor prevent the plane from moving at all? If so, no movement of air over the wings, no lift.