10 foot SWATH

Discussion in 'Boat Design' started by amaurer, Jun 30, 2009.

  1. apex1

    apex1 Guest

    Tom where have you seen counter productive dialogues here?

    Richard
     
  2. peterAustralia
    Joined: Mar 2006
    Posts: 421
    Likes: 51, Points: 28, Legacy Rep: 233
    Location: Melbourne Australia

    peterAustralia Senior Member

    To amaurer,

    Does your craft need to be limited to 10ft (is that a requirement)

    If it was up to me, that is to design a 1000lb craft for 4knots, I would copy a Nigel Irens design. He has done some very impressive trimaran motor vessels, with small outriggers. The outriggers is smooth water just touch the surface, and as such have small drag.

    The main hull can be deep and narrow for good wave piercing ability. The batteries can be down low here, only in the center hull, in order to keep the radius of gyration low (correct term? I mean keep the weights close to the center of rotation of roll). The main hull could be 20ft the smaller hulls about 8ft

    Does your craft need a small turning radius for work in confined waters.

    Are you looking for columbian drug running semi-submersibles in tropical rivers?

    For self righting, a trimaran can have outriggers that rotate and can also be filled with water, using 2 in cooperation could assist in self rigthing.

    Something weird, if the central hull has a couple of circular sections, and the outriggers can be changed in angle by about 20 degrees, Then in unlikely event of capsize, the outriggers could have their angle adjusted a little and the upside down main hull rotates 180 degrees inside it's circular ring frames and continues its voyage.... its just an idea......In other words the craft can continue if upside down by adjusting crossbeam angles and rotating the main hull

    peterAustralia.
     
  3. amaurer
    Joined: Jun 2009
    Posts: 39
    Likes: 2, Points: 0, Legacy Rep: 58
    Location: none

    amaurer Junior Member

    10 feet is not a requirement, the only requirement is total deck area that fits my three 3x5.5' panels.

    As you suggest, a 20 footer also accomplishes this, and perhaps better. I, however, have no real stability requirement, so the trimaran configuration is unnecessary.
     
  4. Stumble
    Joined: Oct 2008
    Posts: 1,913
    Likes: 73, Points: 48, Legacy Rep: 739
    Location: New Orleans

    Stumble Senior Member

    Amaurer,

    I know this is a bit of a change from the discussion so far, but have you considered a canoe? They are very efficient hulls at low speed, can be had for cheap, and if you were to place a watertight deck over it would likely be self righting with little additional work to be done. Something like the Kruger Seawind is designed for heavy offshore work.

    Mounting the solar panels high may cause a bit of a stability problem, but by mounting 1000lbs low in the boat I doubt this would be much of a problem, though I am not enough of an engineer to really tell you.
     
  5. Ad Hoc
    Joined: Oct 2008
    Posts: 7,274
    Likes: 1,164, Points: 113, Legacy Rep: 2488
    Location: Japan

    Ad Hoc Naval Architect

    armaurer

    "..I see you've exhausted the extent of the advice you're willing to give, so thank you for that, in any case..."

    The advice is limited by your replies. Since i see no attempt at that which i have suggested in #21. So no need for any further advice.
     
  6. dskira

    dskira Previous Member

    Since it will be unmanned if I understand well, a very cambered deck will give your SWATH hull the self rifhting without almost any ballast. But the deck should be like a turtle back. Some watertignt hatch will give you the necessary access.
    Quite cool a 10' SWATH. You can try several configuration of SWATH without braking the bank by doing some rough models. It will give you some idea and will, with your caculations, give you some good direction to take. I hope to see the 10' SWATH in the water soon, quite a very nice vessel to do. Can be also a valuable test for a bigger one!
     
  7. dskira

    dskira Previous Member

    Amaurer,
    This is SWATH in testing, perhaps 4' long.

    [​IMG]

    As I says to my previus post, I think your project as you descrived can be realy succesful. Some trial and error are always necessary, but fun and valuable to do.
     
  8. apex1

    apex1 Guest

    This is a SWATH ??? Are you sure???
     
  9. apex1

    apex1 Guest

    I´m not convinced.
    The struts look pretty fat (too fat?), the submerged hull is invisible here, but surprisingly the bulb is visible???
    Some slightly larger examples:
     

    Attached Files:

  10. gonzo
    Joined: Aug 2002
    Posts: 15,769
    Likes: 1,196, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    On post 33 you say you have no stability requirements. Are you really meaning that or just being obnoxious?
     
  11. Ilan Voyager
    Joined: May 2004
    Posts: 1,272
    Likes: 196, Points: 63, Legacy Rep: 758
    Location: Cancun Mexico

    Ilan Voyager Senior Member

    I agree with you Apex, a very peculiar cat, but not a true swath. It seems hard to get an effective decoupling with a such shape. What would be the interest of a swath shape on a 10 feet hull? The size and height of a swath is loosely correlated with the size of the expected waves. What's the purpose of a such "drone"?
     
  12. amaurer
    Joined: Jun 2009
    Posts: 39
    Likes: 2, Points: 0, Legacy Rep: 58
    Location: none

    amaurer Junior Member

    Oh come now. :rolleyes:

    I require a stable design, in the sense that it must return to its upright position (as I mentioned), but indeed I do not have a specific criteria for roll stability margin, as the ability to survive an indefinite number of rolls is a natural requirement for an unmanned craft with limited ability to steer during weather, and I have no crew to keep happy. Of course, the most ridiculous of designs that roll when a butterfly lands on them would be problematic, but lets not get too pedantic here - this is solely a personal project.
     
  13. apex1

    apex1 Guest

    Ahh Ilan, there we have our answer! Look # 37 has changed a bit......:D bigmouth that.
     
  14. mydauphin
    Joined: Apr 2007
    Posts: 2,164
    Likes: 53, Points: 48, Legacy Rep: 575
    Location: Florida

    mydauphin Senior Member

    dskira, repost your picture I can't see it.
     

  15. Ad Hoc
    Joined: Oct 2008
    Posts: 7,274
    Likes: 1,164, Points: 113, Legacy Rep: 2488
    Location: Japan

    Ad Hoc Naval Architect

    I can't see it either...
     
Loading...
Similar Threads
  1. Matatout
    Replies:
    34
    Views:
    681
  2. ExileMoon
    Replies:
    5
    Views:
    669
  3. Turbopleb
    Replies:
    15
    Views:
    2,899
  4. B Goodman
    Replies:
    5
    Views:
    1,472
  5. Turbopleb
    Replies:
    7
    Views:
    1,901
  6. Silvertooth
    Replies:
    15
    Views:
    2,440
  7. Ned Lunav
    Replies:
    21
    Views:
    4,949
  8. Keith777
    Replies:
    18
    Views:
    4,624
  9. gofastguy
    Replies:
    135
    Views:
    19,459
  10. DCockey
    Replies:
    2
    Views:
    1,143
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.