New Age Trawler/Motorsailer; Kite assisted PowerYacht

Discussion in 'Boat Design' started by brian eiland, Nov 20, 2007.

  1. brian eiland
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    brian eiland Senior Member

  2. T0x1c
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    T0x1c Junior Member

  3. kach22i
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    kach22i Architect

    UPDATE: 09/30/13

    Meanwhile, in related news back on land.

    Wind-powered car completes 3,100 mile test ride across Australia
    http://phys.org/news/2011-02-wind-powered-car-mile-australia.html
    [​IMG]
    [​IMG]
     
  4. Mr Efficiency
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    Mr Efficiency Senior Member

    Crazy ! Hooking up to a passing road train would be fun.
     
  5. peter radclyffe
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    peter radclyffe Senior Member

  6. skatun
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    skatun Junior Member

    Hi
    I am wondering if any have some ideas on how to launch the kite from the boat without the need of a helper.

    Sigurd, er du norsk?
     
  7. Herr Kaleun
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    Herr Kaleun Junior Member

    HOISTING/STREAMING A KITE FROM A VESSEL.

    For a sailing vessel, I would suggest that the design of kite be such that it has a horizontal cell, that can be inflated to go rigid, thus acting like a spar to the wing. With a quick release fitting [...poss remote control? Or maybe a slip-hitch on the falling part of the tow-cable] attached to a halyard rove through a pulley high up on the forward facing part of a mast, with a trailing main 'tow-cable' obviously affixed to a fore-deck fitting.
    Attached to the quick release fitting would be a shackle-runner, that would run the course of the forestay.

    Inflate cell/spar, hoist atop, up the forestay [much like hoisting a square'sl], when kite fills/catches the wind, activate release[...either electrically or by tugging on the falling part of the tow-cable, releasing the slip-hitch] and allow to pay out to desired height. [gloves might be prudent...]

    The same system could work from a motor vessel, if it has high enough fore mast.

    Does any of that make sense?:confused:
     
  8. brian eiland
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    brian eiland Senior Member

    Just looking back thru this subject thread,...there were lots of good discussions and links. Its worth a read by those that have never thought about this subject.

    But I guess our low fuel prices over the last 3-4 years have stymied a lot of new development work.
     
  9. brian eiland
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    brian eiland Senior Member

    [​IMG]

    Has anyone seen the latest article on the 276 ft tri-hull motoryacht "White Rabbit" in Boats International mar 2019,....a real eye opener in terms of sea keeping and efficiency.

    This is the same BOLD owner that had the first White Rabbit built. Perhaps I will have the extract a few passages to this article, as it also addresses the MYOPTIC view a great number of non-believers have adopted from early on.
     
  10. brian eiland
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    brian eiland Senior Member

    I have written an email to the author of that Boating International article asking his permission to utilize some of his quotes from his article. The opening sentence in his article really caught my attention,...

    I had a feeling this was going to be interesting :cool:
     
  11. bajansailor
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    bajansailor Marine Surveyor

    These big trimarans certainly do seem to have a lot going for them re relative fuel efficiency and sea keeping.
    Austal have built a few as ferries -
    Benchijigua Express https://www.austal.com/ships/benchijigua-express
    Click on the link to the data sheet for more detailed info about her.

    Some basic info about White Rabbit here -
    WHITE RABBIT https://www.boatinternational.com/yachts/the-superyacht-directory/white-rabbit-golf--81573

    Here is an article about White Rabbit from November last year -
    World's biggest trimaran superyacht White Rabbit delivered https://www.boatinternational.com/yachts/news/worlds-biggest-trimaran-superyacht-white-rabbit-delivered--24541

    And one can buy the March issue referred to above by Brian for GBP 7 -
    Boat International 393 (March 2019) - Boat International https://shop.boatinternational.com/Shop/Product.aspx?offerId=410&sId=10
     
  12. brian eiland
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    brian eiland Senior Member

    I got permission from the author of that Boat International article to post some excerpts from his article. I will likely do that in the next several days.
     
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  13. brian eiland
    Joined: Jun 2002
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    brian eiland Senior Member

    Recently posted here
    Multihull Structure Thoughts https://www.boatdesign.net/threads/multihull-structure-thoughts.62361/page-80#post-882490

    [​IMG]

    [​IMG]

    more images HERE
    Ice Kite | Red Yacht Design https://redyachtdesign.com/project/kite/
     
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  14. bajansailor
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    bajansailor Marine Surveyor

    I had previously posted this note on Brian's thread about aft mast rigs, and Brian suggested that I re-post it on this thread.
    Aftmast rigs??? https://www.boatdesign.net/threads/aftmast-rigs.623/page-78

    I said:
    Brian, I just came across this article from almost 40 years ago about wind assistance for commercial shipping, and I thought you might be interested in it..
    A FRESH WIND FOR SAIL POWER https://www.nytimes.com/1981/12/06/magazine/a-fresh-wind-for-sail-power.html

    They mention Jesse Briggs and SAILA - I had a subscription to the SAILA newsletters in the mid 80's, but sadly something happened, and they were no more.
    Later on they also mention Lloyd Bergeson and the Windship Development Corporation - I will attach a copy of a paper that he presented at a conference in 1985 on wind assist developments for commercial shipping.
     

    Attached Files:


  15. Storm_Eagle
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    Storm_Eagle Junior Member

    The problem with soft kites is their limited lifespan. As a kiteboarder just taking the kite out for a few hours on weekends and buying new kites every few years you probably wont notice it so much. But using a soft kite on a sailing yacht for days and weeks continuously in the wind and the sun will wear out the kite really fast, and you need to replace it often.

    If you don't belive me take a look at a windsock that has been hanging out in the breeze for a while. Or talk to a local paraglider club about their windsocks. They are often totally shredded after just one year out in the wind.

    Both flapping in the wind, and exposure to the UV rays of the sun wears out both the fabric and the lines of a soft kite.
     
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