WIG boat with wingsail

Discussion in 'Boat Design' started by 1J1, Sep 23, 2012.

  1. 1J1
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    1J1 Senior Member

    Hello! Recently I came across in the web many multihull hydrofoil boats with either conventional sails or wingsails. First I wanted to build a scale model of my own design of such boat, actually to just test the self-orienting wingsail I thought of, but then I came up with the idea instead of a frame to use a triangle wing (like those on Lippisch's ekranoplans like X-113) in corners of which would be 3 thin hulls. On forward side hulls there would be installed 2 wingsails in arrangement as /___\, also those 2 hulls will have foils like on Hydroptère trimaran & aft hull also having one foil+rudder. So it would look like a wind-powered ekranoplan with foils.
    I'd like to know whether there are already projects or real models or boats like that, or is what I wrote there actually can be feasible?

    Kind regards
     
  2. 1J1
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    1J1 Senior Member

    It would look like this:

    [​IMG]
     
  3. lucdekeyser
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    lucdekeyser Senior Member

    wig is for flying

    WIG make little sense if you intend to keep parts of the boat in the water unless you use "negative" WIG to make sure you do not fly off and stay in the water (like the shrouds in race cars). Luc
     
  4. 1J1
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    1J1 Senior Member

    There were some WIG/ekranoplan projects that had foils to ease the transition or for stability during the flight. Or better to say those are boats with wing to use that WIG effect & take some of the boat's weight from the foils to reduce the cavitation:
    http://motorka.org/ekranoplany/1841-katera-s-aerokrylom.html
    http://asus2.ru/ekranoplany/89-proekty-hakliza-i-veylanda.html
    http://oi49.tinypic.com/11hguvl.jpg
    Also, just stumbled on this futuristic yacht - http://www.news.com.au/travel/holiday-ideas/flying-super-yacht-revealed/story-e6frfqf9-1226003656725
     
  5. Leo Lazauskas
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    Leo Lazauskas Senior Member

  6. 1J1
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    1J1 Senior Member

    Ok, so I read that in case of hydrofoil/ekranoplan the speed should be like 150-200 km/h or the wing should be massive for the WIG to take an effect, so a "wind-powered ekranoplan" is a fail idea unless it can be an extra-light craft + filled with helium... xD
    However, I think with current arrangement it can be just as a wingsail hydrofoil, while equipped with some propulsion like waterjet or just propeller it might be well as an ekranoplan with hydro-stabilization. Also would be usefull to make wingsails to be able to turn around the horizontal axis on like 90 degrees, increasing the overall wing surface of the craft.
     
  7. tspeer
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    tspeer Senior Member

  8. 1J1
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    1J1 Senior Member

    That might be close but not much. The boat glides on the water but not flies above it as the Hydroptere trimaran, uses one foil for stability on course.
     
  9. 1J1
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    1J1 Senior Member

  10. 1J1
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    1J1 Senior Member

  11. kach22i
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    kach22i Architect

    I have Jane's Surface Skimmers in full sized hard cover for the years 1976-77 and 1987.

    There are many interesting variations of historic record which you may wish to visit and are based on similar themes.
     
  12. Mike Graham
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    Mike Graham Junior Member

    It's my understanding that stall speeds for WIG tend to be upwards of 30kts. If this is a fair understanding, it seems like a sail-powered WIG might be on the very border of feasibility.

    I can see that this idea has been played with before, but has there been much in the way of analysis and tests?
     
  13. 1J1
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    1J1 Senior Member

    I wonder how stable will be such WIG wingsail boat & how much the wind would be affecting the WIG effect. In my design stability will be not only provided by delta-wing itself but by aft rudder/foil (with flaps) too, while the forward side foils would be only needed to ease the transition to fly mode & their vertical parts remain in the water to reduce drag. The boat should be as light as possible too.
     
  14. P Flados
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    P Flados Senior Member

    Ok now for some reality.

    I am all about non-conventional configurations and use of airfoils / hydrofoils to avoid misplacement mode drag and the pounding that comes with planing.

    At first it would seem that either airfoil above the surface or hydrofoil below the surface could do the job.

    When you think of all of the issues with hydrofoils (air entrainment, weed accumulation, underwater AOA/flap control, complex shape fabrication issues, cavitation, damage due to impact) the airfoil above the surface would seem to have lots of potential.

    But then there is one item that kills the idea of airfoil above instead of hydrofoil below for a general purpose sailing craft. This issue is fluid speed vs. boat speed. On an upwind run in a fast boat, you have plenty of lift available. Now turn around and try to make headway on a downwind heading. Airfoils have a hard time even generating enough lift to offset their own weight on a downwind run.
     

  15. 1J1
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    1J1 Senior Member

    If it would be able to sail at speed like 2-3 times of wind speed then I think the WIG effect would still be enough to provide some lift.
     
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