New Age Trawler/Motorsailer; Kite assisted PowerYacht

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

  1. masalai
    Joined: Oct 2007
    Posts: 6,823
    Likes: 120, Points: 0, Legacy Rep: 1882
    Location: cruising, Australia

    masalai masalai

    Fanie, How is that for brainfarts?
     
  2. catmando2
    Joined: Sep 2006
    Posts: 167
    Likes: 4, Points: 0, Legacy Rep: 38
    Location: Australia

    catmando2 Malaysia bound....soon

    I will be very interested to see how that goes as I am again looking at this option for my 50ft cat that I am building.

    How do you think it will go with the fixed blade props?

    Dave
     
  3. FAST FRED
    Joined: Oct 2002
    Posts: 4,519
    Likes: 109, Points: 63, Legacy Rep: 1009
    Location: Conn in summers , Ortona FL in winter , with big d

    FAST FRED Senior Member

    How do you think it will go with the fixed blade props?

    How does any sail boat go with 2 sea anchors being dragged behind ?

    FF
     
  4. Fanie
    Joined: Oct 2007
    Posts: 4,603
    Likes: 170, Points: 63, Legacy Rep: 2484
    Location: Colonial "Sick Africa"

    Fanie Fanie

    You may no get on the plane, Fred :D
     
  5. Fanie
    Joined: Oct 2007
    Posts: 4,603
    Likes: 170, Points: 63, Legacy Rep: 2484
    Location: Colonial "Sick Africa"

    Fanie Fanie

    Hi Mas, ever since you bacame grumpy grampa you cad has deteriorated something terrible :( You have to take extra classes especially before you start your own boat :D
     
  6. masalai
    Joined: Oct 2007
    Posts: 6,823
    Likes: 120, Points: 0, Legacy Rep: 1882
    Location: cruising, Australia

    masalai masalai

    I thought a quick sketch and scan to get it to you before you had a chance to turn your computer off on your way out to go fishing? and as you can read in another thread??? my main toy is down still with motherboard/ram ? defects in manufacture still......... and am using backup notebook with minimal grunt to work up any CAD package.... and I have been in "withdrawal" soo long I have forgotten how to do cad - - - U know - part of the ageing process - the memory fileing system gets corrupted by distractions like boats, booze and sex....
     
    1 person likes this.
  7. eponodyne
    Joined: Aug 2007
    Posts: 327
    Likes: 13, Points: 0, Legacy Rep: 171
    Location: Upper Midwest

    eponodyne Senior Member

    THESE THINGS ARE NOT "DISTRACTIONS!" THESE THINGS ARE THE MAIN EVENT!!!!!
     
  8. masalai
    Joined: Oct 2007
    Posts: 6,823
    Likes: 120, Points: 0, Legacy Rep: 1882
    Location: cruising, Australia

    masalai masalai

    Ok, - - - - their importance starts to over-ride all other considerations in a desperate bid to fulfull ones destiny, to have fun, and procreate, as much as possible - as one gets older one becomes more desperate to "cram it all in".....
     
  9. brian eiland
    Joined: Jun 2002
    Posts: 4,955
    Likes: 181, Points: 73, Legacy Rep: 1903
    Location: St Augustine Fl, Thailand

    brian eiland Senior Member

    ...saw this discussion on another forum...

    Pretty much what I expected, too. Figured if I didn't go, they might fly it and stuff it up even worse (would have been difficult), with no one there to give the other side of the story.

    Outleaders need about 8 knots apparent to fly. This is often available up high, but not at alunch height. Once you know how to fly them, it is possible to launch them on more of a reach, which allows the apparent to work in your favour. However, until you get to this stage, it is much easier to launch and fly them downwind, when apparent works against you.

    As long as the kite always saw 8 knots apparent within 30 degrees either side of ddw, you could hoist it at Cape Verdes, cleat the lines and not worry about it until the other side. What I like about it for shorthanded sailing/racing is that, although it is more likely to fall in the water if the wind changes, it is unlikely to do any harm, just being towed along by the retrieval line (shorter than the flying lines) until you wake up and re hoist it. This compares with a caught aback and/or flogging spinnaker, with the potential to drop the mast and/or capsize the boat.

    Remember that these are first generation kites and there is still a lot to learn, particularly about launching them, line handling ( I have a water driven line retriever which works pretty well) and retrieval. They weigh considerably less than a spi, but are heavier than necessary for light air, when a gossamer version with windsurfer kite lines would fly in lighter air. The lines and kite at present are sized to lift the boat out of the water, which is extreme. Given that the drag of the lines is the biggest performance inhibitor, then lighter lines will make a big difference.

    If you can organise a J24 or similar sized boat, I will bring my 40 sqm across to Sydney next time I visit (or anywhere else I happen to be visiting) and show you how it works.
    regards

    rob
     
  10. rob denney
    Joined: Feb 2005
    Posts: 763
    Likes: 122, Points: 43, Legacy Rep: 436
    Location: Australia

    rob denney Senior Member

    G'day,

    I posted the above after an abortive attempt to fly an Outleader kite on an 80'ter in this years Sydney Hobart. The abort was nothing to do with the kite.

    The offer at the end applies to anyone who is interested in kite technology.

    Also, if anyone has any questions on kite powered boats, I am hapy to try and answer them.

    regards,

    rob
     
  11. brian eiland
    Joined: Jun 2002
    Posts: 4,955
    Likes: 181, Points: 73, Legacy Rep: 1903
    Location: St Augustine Fl, Thailand

    brian eiland Senior Member

    There are a few other 'kite' discussions over here, postings #161 thru #165...
    ...including
    http://www.kit-cats.com/kite/KiteSailPowerboats.htm

    http://www.kit-cats.com/kite/300%20meter%20kite%20sail.htm
     
  12. eponodyne
    Joined: Aug 2007
    Posts: 327
    Likes: 13, Points: 0, Legacy Rep: 171
    Location: Upper Midwest

    eponodyne Senior Member

    Wow, they sure gave up fast.
     
  13. masalai
    Joined: Oct 2007
    Posts: 6,823
    Likes: 120, Points: 0, Legacy Rep: 1882
    Location: cruising, Australia

    masalai masalai

    backwards it seems as the sites are still open....
     
  14. brian eiland
    Joined: Jun 2002
    Posts: 4,955
    Likes: 181, Points: 73, Legacy Rep: 1903
    Location: St Augustine Fl, Thailand

    brian eiland Senior Member

    'Sailing'?? Directly to Windward

    Here's a interesting digression

    So this Dutch artist has created a beautiful propeller-driven skin-on-frame trimaran that only goes directly upwind, without human crew, and set it underway in the western Pacific.

    A fascinating project; be sure to check out the construction photos. Some interesting ideas, to be sure, and good for her for actually getting the thing built and launched.

    Sailing Directly to Windward
     

  15. peter radclyffe
    Joined: Mar 2009
    Posts: 1,416
    Likes: 62, Points: 58, Legacy Rep: 680
    Location: europe

    peter radclyffe Senior Member

    which materials cause the least environmental damage to produce for boatbuilding
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.