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Citation Station: riddle me this gullibies

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  1.  
    • CommentAuthormr. e
    • CommentTimeJul 2nd 2007
     

    plane standing on a runway that can move (conveyer).plane move in one direction, but conveyer move in the opposite direction. This conveyer has control system that tracks the plane speed and tunes the speed of the conveyer to be exactly the same (but in opposite direction).

    The question:

    plane takes off?

    •  
      CommentAuthorYika
    • CommentTimeJul 3rd 2007
     

    No. Please lay off the drugs.

    •  
      CommentAuthorUdoboy
    • CommentTimeJul 3rd 2007
     

    Yika's right. The plane has no air moving under the wings, and therefore cannot generate any lift.

  4.  

    See Bernoulli's theroem, co-efficient of lift etc.

    ( I trained as an aeronautical engineer - but my job now is on an altogether different plane)

    •  
      CommentAuthormargaret
    • CommentTimeJul 3rd 2007
     
    Posted by: mr. e

    riddle me this gullibies

    Gullibies, eh? Are they anything like huckabees? :confused:

    •  
      CommentAuthorYika
    • CommentTimeJul 3rd 2007
     

    I think its Gullifacts told to a person before he sleeps. Gullible Lullabies. Gulliebies. :)

  7.  

    Paul Robeson sang something like..

    So lula, lula lula, gullibye bye."

    I still think he had the most wonderful velvet voice.

    •  
      CommentAuthorUdoboy
    • CommentTimeJul 4th 2007
     
    Posted By: Paulustrious

    See Bernoulli's theroem, co-efficient of lift etc.

    ( I trained as an aeronautical engineer - but my job now is on an altogether different plane)

    Will the puns ever end?

    Sorry, Paul. I'm just playin'

    •  
      CommentAuthorTrance
    • CommentTimeJul 4th 2007
     

    ...On words.

    • CommentAuthor5010
    • CommentTimeJul 6th 2007
     

    Yes the plane will take off of course. The wheel of an airplane does not make it go any faster or slower. It is the thrust from the propellor or jet that gives the forward force.

    So as the prop or jet propels the plane forward at speed X, the belt moves at speed X in the opposite direction and just spin the wheels faster. There is a slight reduction in speed due to wheel friction but wheels are designed to have very low friction so it does not matter. If anything, the ground-effect from the moving belt would increase the lift and allow the plane to take off a little sooner.

    Imagine the problem another way: what if the conveyer belt was slippery and the plane was on sleds?

  11.  

    The ground effect would actually pull the plane down.

    A little experiment. Take a piece of paper, rest your hands on your desk with the piece of paper resting on the back of your hands. Blow sharply underneath the paper. (ie between your thumbs) Instead of rising as you would expect it, the centre will sink down.

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