Swango1980
Well-known member
The plane is moving forwards relative to earth (relative to me, if I was stood on stationary ground, watching it)
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Deleted member 35927
Guest
Yes and it takes off exactly as it did every other time. Is the weight important, it's either takes off or it doesn't
Arthur Wedge
Well-known member
Sorry can’t find any practical examples or practical tests on the thread - a few “theories” etc
Bunkermagnet
Journeyman Pro
Got to love a rinse and repeat footy/WHS thread.
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Deleted member 35927
Guest
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Deleted member 35927
Guest
No this will fade away soon enough.
RichA
Well-known member
Ffs. So the conveyor isn't reversing against the wheels to keep the plane stationary; it's rolling forwards at high speed and the wheels aren't moving at all, like Crow said earlier.
What a waste of brain energy!
Arthur Wedge
Well-known member
Ffs. So the conveyor isn't reversing against the wheels to keep the plane stationary; it's rolling forwards at high speed and the wheels aren't moving at all, like Crow said earlier.
What a waste of brain energy!
Thought the initial meme said the conveyor belt matches the speed in the opposite direction
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Deleted member 35927
Guest
It's a treadmill doing what a treadmill does. (Or a conveyor)
Swango1980
Well-known member
As I've said several times, whatever the treadmill is doing or is programmed to do (as per OP), it is irrelevant. It won't resist the thrust against the air by the engine.Ffs. So the conveyor isn't reversing against the wheels to keep the plane stationary; it's rolling forwards at high speed and the wheels aren't moving at all, like Crow said earlier.
What a waste of brain energy!
So many comments have been made, and so many of my comments have been spin offs / responses to those.
I think my biggest surprise is that some genuinely seem to believe a treadmill can effectively cancel out the thrust of a jet engine, and keep the plane stationary
Bunkermagnet
Journeyman Pro
What...you actually believe a 747 would be sat waiting on a conveyor belt waiting to take off?
Swango1980
Well-known member
RichA
Well-known member
So what's the craic with referencing the Mythbusters video, in which the "treadmill" goes in the opposite direction to the plane and the treadmill speed and wheel speeds are clearly not matched?
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Deleted member 35927
Guest
That's how treadmills work , the opposite of where youre going
Swango1980
Well-known member
Nor will they be matched in the OP. Which I've already discussed.
They may be programmed to try and achieve the same speed. But, the OP doesn't say they achieve the same speed. As soon as an outside force (thrust) propels aircraft forwards, the wheels speed up. The treadmill will speed up based on it's programming, but that just speeds wheels up even more, etc.
Mind you, OP never says engine is used to propel plane forwards. So, the speeds will definitely match up if they are both moving at 0mph. The plane would not take off if that were the case
Crow
Crow Person
For those asking to see video evidence, there isn't a conveyor belt long enough to film it (as I imagine you all know) but try this:
A planes is on skis.
The skis represent the section of the conveyor under the planes wheels.
As the plane accelerates the conveyor belt/skis speed up to match the speed of the plane and so the wheels don't turn.
The plane reaches take off speed (as does the conveyor belt) and up she goes!
It isn't a treadmill, it's a conveyor belt.
Now watch the video.
A planes is on skis.
The skis represent the section of the conveyor under the planes wheels.
As the plane accelerates the conveyor belt/skis speed up to match the speed of the plane and so the wheels don't turn.
The plane reaches take off speed (as does the conveyor belt) and up she goes!
It isn't a treadmill, it's a conveyor belt.
Now watch the video.
GreiginFife
Money List Winner
I don’t think a plane is aerodynamic enough, treadmill or no.
RichA
Well-known member
Ok. Figured out that I believe Swango and Pete think this thing works very differently.
Swango sees is that the wheels are not rotating but the conveyor belt is travelling at high speed until the plane reaches normal take off speed.
Pete sees is that the plane remains stationary relative to a bystander and airspeed required for takeoff is achieved by airflow across the wings generated by the jet engines.
Is that an accurate summary?
Swango sees is that the wheels are not rotating but the conveyor belt is travelling at high speed until the plane reaches normal take off speed.
Pete sees is that the plane remains stationary relative to a bystander and airspeed required for takeoff is achieved by airflow across the wings generated by the jet engines.
Is that an accurate summary?
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Deleted member 35927
Guest
No, the plane moves forward and takes off as it would any other time. It's a straight forward take off, no magic or jiggery pokery.
No what ifs, just simple physics and the laws of motion
Swango1980
Well-known member
Not on my part.
I believe the treadmill is running very quickly in the opposite direction to the plane. But, it does nothing to slow the plane down, and the engines thrust it forward and it takes off in the normal way a plane takes off
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