boats that are designed with car aerodynamic method?

Discussion in 'Hydrodynamics and Aerodynamics' started by dina, Oct 5, 2012.

  1. Remmlinger
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    Remmlinger engineer

  2. Frosty

    Frosty Previous Member

    yeah,-- tunnel boats are made to fly, but never take off.

    Wana see some aerodymic whatsits look the Aussie 1000 MPH car Oh forgot to google it first.
     
  3. tunnels

    tunnels Previous Member

    they used to try and take off till they realised they were not aerodynamicly stable !! so they had to change some of the design of the boat !:p
     
  4. Leo Lazauskas
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    Leo Lazauskas Senior Member

  5. tunnels

    tunnels Previous Member

  6. Frosty

    Frosty Previous Member

    Surley this did not come as a shock to them when you have 90 % of the weight of the boat hanging off the back.

    The word pendulum comes to mind, every one does exactly the same thing.
     
  7. Remmlinger
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    Remmlinger engineer

    Ground effect

    Leo, there is an interesting difference between the russian ekranoplans and Jörg's invention. The ekranoplans have one wing in the middle of the fuselage and a huge tail elevator that is needed for the highly complicated control of the pitch attitude. Attitude and flying hight can only be controlled by an autopilot. Manual control would be beyond the capabilities of a human being. In contrary Jörg's invention uses two tandem airfoils that create a craft that flies inherently stable without electronics. Flying his boat is easier than driving a car. I talked to Jörg in 1984 when he wanted to hire a R&D engineer. He was a great inventor but, as so often, a bad manager and no business man. http://airfoil-flairliners.blogspot.de/
     
  8. Leo Lazauskas
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    Leo Lazauskas Senior Member

    Thanks, Uli. I appreciate that they are not the same, but they are
    interesting historical (and imaginative) examples in their own right.

    I'd like to see how Jörg's invention handles large waves coming from a variety
    of angles. He claims that the boat "flattens" waves, but I'm not convinced
    yet.
     
  9. Remmlinger
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    Remmlinger engineer

    No question http://www.darkroastedblend.com is fun reading and looking at the adventurous designs, especially after all the mathematical equations have made me dizzy.
    You sure are right. His 12-seater, which was built in 1985 (if I remember right) together with a german ship yard, suffered a severe accident when it "capsized" in the air at high speed. It seems that the root cause was never investigated. Instead the ship yard stopped immediately all activities on the project.
    Uli
     
  10. Ad Hoc
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    Ad Hoc Naval Architect

    As Remmlinger has already mentioned, it is about pitch control, not wave control!!

    Sounds fishy to me :p
     
  11. Leo Lazauskas
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    Leo Lazauskas Senior Member

    I assumed he had pitch reasonably under control, but that quartering waves
    could cause it to roll because lift would be higher on one side than the other.
    I imagined it cork-screwing before disintegrating. :eek:
     
  12. BMcF
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    BMcF Senior Member

    H1/100 waves have been the bane of WIG concepts since...forever.
     
  13. Stephen Ditmore
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    Stephen Ditmore Senior Member

  14. Leo Lazauskas
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    Leo Lazauskas Senior Member

    Did they ever live up to their promise at full-scale?
    I know at least one was built about 8 years ago, but I'm not sure if there are
    any in service. Same with the Harley SES concept - have any made it to large
    scale?
     

  15. tunnels

    tunnels Previous Member

    To get a better idea what its all about see if you can find Formular 1 tunnel boat racing .
    See the boats ,
    think of the horse power ,
    and then get the idea how fast they are going ,
    just above the surface of the water .
    There manouverability is increadable and they turn really quickly .
    There speed and performance will make your head spin . i used to travel for miles any where in the country to watch them racing . :D:p:p
     
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