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The conveyor belt runway question - what do YOU think?

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  • The conveyor belt runway question - what do YOU think?

    On a day with absolutely calm wind, a plane is standing on a runway that can move (some sort of band conveyor). The plane moves in one direction, while the conveyor moves in the opposite direction. The conveyor has a control system that tracks the plane speed and tunes the speed of the conveyor to be exactly the same (but in the opposite direction). Can the airplane ever take off?

    smurfco says yes. what's your answer?

  • #2
    Abrasion says no
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    • #3
      Originally posted by Abrasion
      Abrasion says no


      why does Abrasion say no? smurfco said no at first too.

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      • #4
        No.

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        • #5
          Originally posted by smurfco


          why does Abrasion say no? smurfco said no at first too.


          Because as far as Abrasions understanding of aeronautics goes, a plane derives its lift from the air above the wing moving more slowly than the air below the wing, but if on a conveyer belt, the air wont be moving, so the aerofoil wont have any effect

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          • #6
            Keep in mind that an airplane doesn't move forward because of power coming from the wheels. It comes from the propellors / jets.

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            • #7
              yes.

              because it doesn't state the plane is not moving across the conveyer belt. it just says the belt is moving in the opposite direction.


              therefor giving it motion, allowing there to be difference in the air under the wing as to the air above the wing.

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              • #8
                Originally posted by smurfco
                Keep in mind that an airplane doesn't move forward because of power coming from the wheels. It comes from the propellors / jets.


                I dont see the relevance of this?
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                • #9
                  Originally posted by Abrasion


                  I dont see the relevance of this?


                  Pulling air.

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                  • #10
                    i dunno, but people better stop standing like lumps on those things and on escalators. or at least move to the ****************ing side.

                    There is a cult of ignorance in the United States, and there always has been. The strain of anti-intellectualism has been a constant thread winding its way through our political and cultural life, nurtured by the false notion that democracy means that "my ignorance is just as good as your knowledge." - Isaac Asimov, Newsweek (21 January 1980)

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                    • #11
                      w0rd!

                      i like walking on them.. feels like i'm ZOOOOOMING down the hall
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                      • #12
                        Originally posted by smurfco


                        Pulling air.


                        Yes, pulling air from the front and pushing it out the back.

                        This will give thrust, no doubt, but without the air moving past the wings (the engines will only provide some air through the engines, nothing to do with the aerofoil effect) then there would still be no lift, unless the engines were pointed at the ground.
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                        • #13
                          No, the plane has to move to take off. But if you found a way to instantly stop that conveyor, the plane would shoot forward, and the G forces would probably kill everyone inside.
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                          • #14
                            it is moving...
                            "Ohmygod, don't give phunkyfred2 a harp guiter---" ~ Danocoustic

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                            • #15
                              Seems like the huge, rapidly-moving conveyor belt would create negative air pressure approaching its surface, holding the plane down tighter than if it were just standing still.

                              But I don't know. Only took one aero eng class in college, and this topic never came up.

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