Airplane on a Conveyor conundrum

[white akita]

even my girlfriend understands that it would fly after the obvious was pointed out and she is as daft as a brush !

[Slugsie]

OK DieselBoy, do me a favour. Hold off on this until you do get a chance to watch the video.

Then, tell us where the flaw in their reconstruction is. Remember, they actually did it, and the aircraft flies with ease, so it's going to have to be a pretty big flaw to have any actual effect on the outcome.

[Sancho]

I can't believe you're still going. I actually did some work.

[Slugsie]

I can't believe you're still going. I actually did some work.

I'm only doing it as a constructive way to post-whore. Only 9 off my 2K now.

[dieselboy]

Descibe/ define this force, how is it acting on the plane? The only contact it has with the plane is through the wheels, which turn freely. Also, how is this force changed by different levels of thrust from the engines acting on the air. Just tell us how exactly it affect the plane.

the only way that conveyor wouldnt have an effect on the plane is if the plane wasnt touching it at all.

believe me, ive fallen over enough times to know that there is friction on that floor

[dieselboy]

OK DieselBoy, do me a favour. Hold off on this until you do get a chance to watch the video.

Then, tell us where the flaw in their reconstruction is. Remember, they actually did it, and the aircraft flies with ease, so it's going to have to be a pretty big flaw to have any actual effect on the outcome.

their conveyor wasnt moving the same speed as the plane was producing thrust!

thats a ###### big flaw

[dieselboy]

even my girlfriend understands that it would fly after the obvious was pointed out and she is as daft as a brush !

of course it would fly.
the conveyor never moves

[Slugsie]

their conveyor wasnt moving the same speed as the plane was producing thrust!

thats a ###### big flaw

Erm, that was never a condition of the problem, so that argument is pointless. But even if the conveyor was travelling at 10x the speed of the plane, it wouldn't affect the result.

[Slugsie]

of course it would fly.
the conveyor never moves

We have already covered that, the actual speed of the conveyor, relative to anything is irrelevant.

[Chillitt]

the only way that conveyor wouldnt have an effect on the plane is if the plane wasnt touching it at all.

believe me, ive fallen over enough times to know that there is friction on that floor

Yes, but you do not have wheels....

[yoshie]

ok, throttles wide open, and this means that in normal circumstances at this altitude, the plane can say reach 600mph only.
therefore the conveyor is going the opposite way at 600mph
in this case the plane will not take off.
the plane will be stationary relative to the ground.
this means, the plane will appear to be stationary.

Jeeze are you really no getting this the conveyor can do 600000mph but as soon as the plane throttles up it will move forward as drive is from thrust not the wheels.

I think I may be feeding the trolls here, is this a wind up to keep a post going

[MattF]

I think I may be feeding the trolls here, is this a wind up to keep a post going

[MattF]

To win the most drawn out thread trophy, currently held by MattF.

[MattF]

If, as you say, the plane isn't moving, then nor is the conveyor belt...

So how can the plane take off then?

[MattF]

But given that the planes speed is measure relative to the ground, the conveyors speed has also to be measured relative to the ground. Therefore the relative speeds between the plane and the conveyor becomes 20mph if they're both moving at 10mph (one forward, one backward).

**sigh**

One thing you fail to mention however. If both speeds are relative to a fixed point, then both speeds are actually also relative to each other.