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Can a Plane on a Treadmill Take Off?



 
 
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  #6  
Old February 5th 06, 04:59 AM posted to rec.aviation.student,rec.aviation.piloting
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Default Can a Plane on a Treadmill Take Off?

Dave Doe wrote:

We aren't talking about the forces at work on the wheel or tire, we are
talking about the forward velocity. I can see this concept is lost on you.


There is no forward velocity - there *is* a change in angular momentum
though. Do you not understand that concept?


I proudly profess to not understand that a point on the top of a tire
does not move at twice the velocity of the axis of the wheel on which
that tire is mounted.
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Alex -- Replace "nospam" with "mail" to reply by email. Checked infrequently.
  #7  
Old February 5th 06, 05:24 AM posted to rec.aviation.student,rec.aviation.piloting
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Default Can a Plane on a Treadmill Take Off?

I undertand that, for any one given point on a wheel, mounted on a vehicle,
traveling horizontally, more or less, there is a forward velocity (not
constant) for exactly one half the time, and a rearward velocity (not
constant) for exactly half the time, in relation the wheels' point of
rotation. The average of this constantly changing velocity just happens to
be the same as the forward speed of the vehicle.

There is no forward velocity - there *is* a change in angular momentum
though. Do you not understand that concept?

--
Duncan



  #8  
Old February 5th 06, 04:27 AM posted to rec.aviation.student,rec.aviation.piloting
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Default Can a Plane on a Treadmill Take Off?

Dave Doe wrote:


Try this for a brain scrambler. Think about a tire on your car, driving down
the highway. At the point where the tire contacts the ground, it's speed is
zero. 180° away, at the top, it is moving forward at twice the speed of the
car.


Negative - yer forgetting centripetal force.

http://www.wordiq.com/definition/Centripetal


Well, I'm impressed that you know of the existence of centripetal
force. But in what possible way do you think it negates the comment
about the speeds (relative to the ground) of points at the top and
bottom of the tire on a moving car?
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Alex -- Replace "nospam" with "mail" to reply by email. Checked infrequently.
 




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