Tweaking a GHOST multihull design for a personal cruising watercraft

Discussion in 'Multihulls' started by Sundevil, Nov 16, 2014.

  1. Sundevil
    Joined: Jan 2012
    Posts: 45
    Likes: 1, Points: 0, Legacy Rep: 15
    Location: Ohio, USA

    Sundevil Junior Member




    Do you guys think a smaller 28-34' version of this boat for personal use would be feasible? (Without the supercavation or anything fancy for those who are familiar with the specs.) Would you change anything about the design of this boat? I know that SWATH boats have some big challenges getting buoyancy and weight just right.

    The only thing I think could be improved on is if the sides were not solid. The wind load would be decreased, and any waves hitting from the side would have less surface area to hit.

    I'm not too concerned about the width of the boat, but I would need an easy way to anchor the boat, and to depart the boat via dingy or kayak. I would think that it would be able to handle the water conditions in the ICW, Great Lakes, Mississippi River, and Florida.
  2. Ad Hoc
    Joined: Oct 2008
    Posts: 7,114
    Likes: 1,056, Points: 113, Legacy Rep: 2488
    Location: Japan

    Ad Hoc Naval Architect


    Look at the size of the 'tubes'. Pencil thin, ergo, not much buoyancy.

    Personal use = lots of heavy bits of kit = not possible on such a small boat.
  3. upchurchmr
    Joined: Feb 2011
    Posts: 3,249
    Likes: 234, Points: 63, Legacy Rep: 579
    Location: Ft. Worth, Tx, USA

    upchurchmr Senior Member

    The only thing I would change would be to eliminate the too small in water bouyancy, reduce the "water wings" to a single center strut, stretch out and smooth out the passenger hull, add a mast and a sail.

    In other words turn it into a real boat not a reject from the stealth development for the military.
    Unless you are into drug running or invasion of Cuba (again).

    Now that I got that out of the way, what do you want it for?
    Is this like the Batman automobile - no real purpose but to have everybody look at your pile of money?

    I'll probably regret this post, but really now - what is this thing going to do for you?
  4. Jim Caldwell
    Joined: Aug 2013
    Posts: 267
    Likes: 8, Points: 18, Legacy Rep: 48
    Location: Cleveland, Ohio

    Jim Caldwell Senior Member

    The power cat's work well on lake Erie. No advantage to reinventing and too many downsides.
  5. Moggy
    Joined: Feb 2011
    Posts: 181
    Likes: 8, Points: 0, Legacy Rep: 76
    Location: Somewhere else!

    Moggy Senior Member

    Looks like it belongs to Darth Vader.
  6. Alik
    Joined: Jul 2003
    Posts: 3,007
    Likes: 300, Points: 93, Legacy Rep: 1306
    Location: Thailand

    Alik Senior Member

    Side wings would work excellent as water slider or for evacuation.
    But be careful boarding this stuff from the side in marina!
  7. oldsailor7
    Joined: May 2008
    Posts: 2,097
    Likes: 41, Points: 48, Legacy Rep: 436
    Location: Sydney Australia

    oldsailor7 Senior Member

    For several years hydrofoil ferries operated on Sydney harbour. They were fast and popular, but severe vibration caused many maintenance problems. These contributed to the decision to switch to fast catamaran ferries, which are still operating to this day.
  8. whitepointer23

    whitepointer23 Previous Member

    What caused the vibrations. Was it the foils or something to do with the drive system.

  9. hump101
    Joined: Oct 2004
    Posts: 261
    Likes: 14, Points: 18, Legacy Rep: 58
    Location: Brittany, France

    hump101 Senior Member

    That is interesting. The move from hydrofoils to fast cats for ferries in Europe was driven by fuel consumption vs. displacement, the fast cats achieving far lower relative fuel consumption, and still going fast enough, if not as fast as the foils.

    However, the fast cats were much more prone to vibration causing fatigue issues, due to the hydrodynamic loads, construction methods, and the engine choices. Refinements in the detailed structural design has solved most of these issues.

    Vibration in the hydrofoils was usually cavitation related, due to the foil profiles being pushed at speeds beyond their cavitation limits, and reducing speed would solve most of these issues. I did a research contract on this back in the 90's when the cats were starting to take over.
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.