Lostcause said:
Are you preposing that the friction between the travelator and the air will create a significant (or at least noticable) wind?
Do I understand you here?
I'd agree it creates a minute draft, but not enough to influence the experiment.
Lostcause said:
Not me! Haha, a friend of mine (who is building) showed me this - and I was compulsed to write. I once built a radio in a college physics class though once lol.
Ah, an outsider, welcome!
You never know, get browsing the other pages and you may be compelled (or is that propelled) to have a go....
You never know, get browsing the other pages and you may be compelled (or is that propelled) to have a go....
Lostcause said:
Yes the belt is ripping right along under the plane. But, for the plane to make any progress relative to its surroundings, it must roll forward faster than the belt rolls backwards. This is not allowed in the given set up.
Draw your two circles and you will see that for one circle to make progress, it must revolve around the other. If one is going around the other, then it must be travelling faster than the other.
Max
eVITAERC said:
Quite possibly.
Now add the influence of the external thrust, (the aircraft engine), to the system. Attach a long piece of string with a weight on the end to the centre of the tape, allowing it to pivot freely around the central axis. Chuck the weight out of the window so it pulls the tape forwards. Now however fast you pull the paper out, the roll will still head towards the window at a high rate of speed. It happens. I just tried it.
Lostcause said:
Ah, well since I can't pm you, I'll say here - thanks for the welcome. I'm a computer builder and might poke around this site a bit looking for some tips about heatsinks and other stuff. (I think I am thread-jacking now).
The thing is, lets just say we agree to disagree on this one.maxro said:
You still have not linked the air the wings are passing through to the ground speed. You cant they are not coupled by anything.
You could have all sorts of wierd things happening to the wheels...it just does not matter...the plane is moving forward as a result of engine propulsion what happens below it is irrelevant.
(back to the fight)
It's very relevant - in fact below is moving in the opposite direction at the same speed cancelling any forward movement relative to the earth
Lostcause said:
It's very relevant - in fact below is moving in the opposite direction at the same speed cancelling any forward movement relative to the earth
RDFan said:
But the rotation of the earth and the airspeed above it are not significantly linked, so that kinda pours water on that argument.
pinkmouse said:
It is relevant. The plane moves forward with respect to the belt. The belt (with the plane on it) moves back with respect to the earth. So the plane's movement relative to the earth is nothing.
I don't think eVITAERC's experiment proves anything contrary to what I said. Maybe he can pip in and answer.
RDFan, you need to decouple the plane from the wheels, thay are not the driving force.
The engines move the air above the ground
The engines are strapped to the plane
The wheels are free to move as the breaks are not on
the movement of the wheels is a result of the movement of the plane not the other way round.
The engines move the air above the ground
The engines are strapped to the plane
The wheels are free to move as the breaks are not on
the movement of the wheels is a result of the movement of the plane not the other way round.
Oh, I wish I could post a video...
Try the experiment yourself. It took me about two minutes to build the apparatus, and about 5 minutes on the kitchen table to prove my hypothesis to my satisfaction. I'm sure the results are repeatable. Whatever speed you try and pull the paper away from underneath the wheel, it moves forward.
Try the experiment yourself. It took me about two minutes to build the apparatus, and about 5 minutes on the kitchen table to prove my hypothesis to my satisfaction. I'm sure the results are repeatable. Whatever speed you try and pull the paper away from underneath the wheel, it moves forward.
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