trimaran flying on 1 ama

Discussion in 'Multihulls' started by rapscallion, Nov 11, 2007.

  1. rapscallion
    Joined: Oct 2006
    Posts: 504
    Likes: 15, Points: 18, Legacy Rep: 132
    Location: Wisconsin

    rapscallion Senior Member

    The seacart 30s amas displacement are something like 3.5 times the weight of the main hull.

    if you have amas that are 150 or 160 percent displacement of the main hull you can still bury the ama. So what is a good minimum displscement if you are looking to make an ama that won't submarine?

    There is a cool video of a kurt hughes tri on u tube. Watching that video is what got me thinking about this.
     
  2. Doug Lord

    Doug Lord Guest

    I think it depends on whether or not the design is expected to be it's fastest when flying the main hull and whether or not the ama's are designed to plane or use foil assist to reduce displacement when the main hull is flying.
     
  3. rapscallion
    Joined: Oct 2006
    Posts: 504
    Likes: 15, Points: 18, Legacy Rep: 132
    Location: Wisconsin

    rapscallion Senior Member

    I was thinking of a non foil design. I was wondering how big I would have to design an ama in order to insure I wouldn't bury it. I'd rather fly on one ama than bury her in a fantastic spray of white ocean goodness.

    I suppose the seacart 30 proportions would insure that...
     
  4. Chris Ostlind

    Chris Ostlind Previous Member

    200% is a nice place to be, Raps.
     
  5. waikikin
    Joined: Jan 2006
    Posts: 2,263
    Likes: 90, Points: 58, Legacy Rep: 871
    Location: Australia

    waikikin Senior Member

    Raps, a frend of mines got a nice 9.5m tri he drives on one hull, the foils & rudders are in the floats, I sailed on it four times, three times in the Wangi regatta, one race(two where very light) the main hull came clear on windward legs- the difference is cool- gets much quieter & really starts to smoke along- glad he was driving though & I reckon in that size range its a much better flat/inshore thing to do, if ocean bumps enter the equation it might get too interesting! for me, although I'm sure those with the skills & gonads for it would love it. All the best from Jeff. PS: no idea on the volume ratio.
     

  6. rapscallion
    Joined: Oct 2006
    Posts: 504
    Likes: 15, Points: 18, Legacy Rep: 132
    Location: Wisconsin

    rapscallion Senior Member

    I have Kurt's design portfolio. I never noticed this before, but his tomcat 30 design has rudders on the floats. The displacement of the tomcat's amas are greater than his other 30' designs but the boat is about the same weight. I'm thinking he wants that boat to fly on one hull. The more I learn about trimaran design the more I like his stuff.
     
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.