Plane

[Arthur Wedge]

Maybe it’s a Hawker Siddeley Harrier on the conveyor

I’m just wondering if it’s an African or European 747

 

[Imurg]

What I really need to know is how many calories this plane is eating up on this conveyor..........

 

[Deleted member 35927]

I think you have been led down an internet rabbit hole by a professional wum… or you are playing devils advocate (you little devil )

You are ignoring physics, the plane wing needs horizontal motion to provide lift, the OP says the treadmill somehow negates this (in spite of Pete trying to say it says something else now) no forward motion no lift. Simple stuff.

What would happen in the original scenario is the wheel bearing would overheat and disintegrate, the wheel mount would hit the treadmill that’s travelling at about 600mph and fly off the back.

Your making the error that the conveyor will cancel out the thrust. Quite a common one.

 

[Deleted member 36735]

The engines give it thrust to move through the air not along the ground.

This is what is confusing you.

That is wrong. The engines move it forward if the wheels have something providing friction, such as a runway tarmac. Once the plane gets up to speed, the air around the wings creates the lift.

In your scenario, repeat YOUR scenario, there is no friction on the wheels as the treadmill stops the plane from moving forward, hence it is impossible to get lift as there is no airflow.

Not sure how many explanations that is, hopefully one will resonate with you at some stage if you're not trolling us.

 

[Deleted member 36735]

Your making the error that the conveyor will cancel out the thrust. Quite a common one.

It's common because that's exactly what the scenario says

 

[Deleted member 35927]

This is what is confusing you.

That is wrong. The engines move it forward if the wheels have something providing resistance, such as a runway tarmac. Once the plane gets up to speed, the air around the wings creates the lift.

In your scenario, repeat YOUR scenario, there is no friction on the wheels as the treadmill stops the plane from moving forward, hence it is impossible to get lift as there is no airflow.

Not sure how many explanations that is, hopefully one will resonate with you at some stage if you're not trolling us.

Dear deary deary me. The wheels are irrelevant, planes don't need them. Hopefully at some point you'll take time to read up and realise your errors. Also troll ? Come on surely youre better than that no ?

 

[Beezerk]

Heathrow are going to save millions by not having to build a runway, genius

 

[Billysboots]

Any more accusations of trolling and this thread will be locked. I’m absolutely staggered that a thread which is essentially a bit of fun is causing such bickering.

 

[Deleted member 35927]

OK, don't argue with us, argue with NASA.

NASA - Dynamics of Flight

Im not disagreeing with the laws of motion, just treadmills with planes on.

 

[Deleted member 36735]

NASA - Dynamics of Flight

 

[Swango1980]

Maybe this will be of interest to some. Can just skip to about 6.30ish in clip.

The plane will always be thrust forwards, the ground is irrelevant (unless you put an immovable wall in front of plane), because a car and a plane of thrust forwards using very different methods

As I said before, I think the question is worded badly, because it is impossible for wheels of plane and treadmill to be be moving in opposite directions at same speed. Unless there is a plane whose engine drives the wheels to move it down a runway

 

[Crow]

What makes the wheels turn is the fact that they're moving over the runway, which is static.

If the runway (conveyor belt) moves at the same speed as the plane, then the wheels won't rotate. Say the plane moves at 75 mph for example, runway (conveyor belt) moves at 75 mph, wheels don't rotate but, the plane is still travelling forward at 75 mph and enough velocity to take off.

 

[Swango1980]

Assuming it doesn't skid, then obviously that is correct.
If something lands at 180mph on a surface travelling at 180mph in the opposite direction , it will of course stop immediately with no skid.

If you genuinely believe those words, and not prepared to question where the logic in that breaks down, then I suppose there is no discussion to be had.

However, I'm pretty sure there was never a design consideration to have a treadmill on an aircraft carrier to stop landing planes quickly. And if that prototype was ever made, I feel really really sorry for the test pilot

 

[Deleted member 35927]

Maybe this will be of interest to some. Can just skip to about 6.30ish in clip.

The plane will always be thrust forwards, the ground is irrelevant (unless you put an immovable wall in front of plane), because a car and a plane of thrust forwards using very different methods

As I said before, I think the question is worded badly, because it is impossible for wheels of plane and treadmill to be be moving in opposite directions at same speed. Unless there is a plane whose engine drives the wheels to move it down a runway

A very good explanation.

 

[SatchFan]

Full credit to the OP for starting this thread and keeping people occupied through the day. I spotted this article on Facebook this morning with a similar range of reactions.

 

[Deleted member 36735]

What makes the wheels turn is the fact that they're moving over the runway, which is static.

If the runway (conveyor belt) moves at the same speed as the plane, then the wheels won't rotate. Say the plane moves at 75 mph for example, runway (conveyor belt) moves at 75 mph, wheels don't rotate but, the plane is still travelling forward at 75 mph and enough velocity to take off.

But the scenario is that the conveyor belt is travelling in the opposite direction, ie backwards in relation to the plane, so the plane is therefore not moving in relation to the ground, hence no airflow and no lift.

 

[NearHull]

I have 47 years of aircraft engineering experience and I think that the question ignores the opinion that WHS is geared towards high handicappers.

There….thats got this thread back on track!

 

[Deleted member 35927]

But the scenario is that the conveyor belt is travelling in the opposite direction, ie backwards in relation to the plane, so the plane is therefore not moving in relation to the ground, hence no airflow and no lift.

As has been pointed out time and time again, this is of no consequence as the plane propels itself buy pushing against the air and not the ground. It makes no difference what the wheels are doing

 

[Voyager EMH]

It's obviously yes, but I'm surprised how many try and argue otherwise.

I'm not surprised.

 

[Deleted member 35927]

I'm not surprised.

View attachment 56879

Hey it's the thread killer