Here are my goals... does a design exist?

Discussion in 'Boat Design' started by rbarna, Apr 18, 2011.

  1. rbarna
    Joined: Apr 2011
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    Location: NYC

    rbarna New Member

    Hello. I'm a boat user, not a designer.

    I'd like to commission a project and think a good place to start is to see if there are existing designs which can be built that match my goals.

    The application is for use in a 30mi daily commute by water in the hudson river @ >50kts cruising speeds. Sea conditions can at times be rough 3'-4' with some standing waves. I do this daily now in a 30' superboat y2k (http://www.superboatonline.com/30p.html) so I'm familiar with the waterway and the performance of the superboat design.

    The design goals for my next boat are:

    1) A hull design that is able to attain higher speed at a given fuel consumption rate than the commercially available "go fast" designs. It seems to me that there are design decisions that go into what's available commercially that result in weight and drag/wind resistance.

    2) Some protection the operator from wind, rain and sun during the commute but can also be used in a "pleasure" configuration for up to 5 guests on weekends

    3) Dual Outboard powered - they seem more efficient than the inboard/sterndrive configuration. Redundancy is important to me as well, so I'd rather have a double than a single source of propulsion.

    4) Well balanced at high speeds on rough water. Running at 40kts+ in seas of 3' the boat should be well composed and balanced. The hull should also be strong enough to withstand significant wave pounding.

    5) Hull Design and construction costs less than $80k (rigging and motors not included)

    Based on my use of commercially available "go-fast" boats, I'm thinking about a planing deep V stepped hull LOA 35-45' beam 7-8' for use with outboard power reaching speeds as high as 100mph.

    I could be wrong...

    So point me in the right direction?

    Thanks in advance!

    -Ross
     
  2. rbarna
    Joined: Apr 2011
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    Location: NYC

    rbarna New Member

    Oops, I forgot to mention range. Range should be approximately 200nm on a full tank. I could sacrifice some range if needed.
     
  3. tom28571
    Joined: Dec 2001
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    Location: Oriental, NC

    tom28571 Senior Member

    You can get all you want in a boat but it will probably cost way more than $80K. That amount of cash will only get you a typical 25' to 30' boat with speed up to 30 - 40kts or so in moderate water. Engines extra. Custom design extra. These guestimates are gross but you are well under what such a boat will cost. A used Scarab maybe.

    2007 SCARAB 35

    $115,000.00

    North Fort Mye…, FL
     
  4. bigbowen
    Joined: Apr 2011
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    Location: Wales Uk

    bigbowen Junior Member

    rbarna,
    Im no expert here, Id just like to say Im jelous of you being able to commute by water, maybe NYs not so bad after all :)
     
  5. CatBuilder

    CatBuilder Previous Member

    Tom is correct above. Your budget is much too meager for this project.

    If you want new and custom, you have to pay for new and custom. Or... buy some off the shelf boat that already exists, used, that might be in your price range.

    BTW: Excellent use of the boat, but I am curious, having lived in Manhattan for 6 years.......

    What type of slip do you have for this commuting machine once you arrive in Manhattan?? Chelsea Piers? 79th Street Boat Basin? Some super-secret place like where Bloomberg keeps his boat or even better?
     
  6. Kestrel
    Joined: Nov 2010
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    Location: Milan Italy

    Kestrel Junior Member

    The coice of a V-hull of the (transverse) stepped type is quite right for the targets of Your design. It offers the possibility to combine parameters in a mix for the best efficiency, depending on the goals wanted. A single step, 18-21 deg deadrise could be suitable.
    Give a look: http://www.idet.it/idra.html
    may be a preliminary feasibility study could be made.

    Bye

    K.
     
  7. BertKu
    Joined: May 2009
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    Location: South Africa Little Brak River

    BertKu Senior Member

    Would a flying dolphin type of boat not of a solution? The ski's would certainly allow you a higher speed without too much power requirement while cruising.
    Bert
     
  8. Squidly-Diddly
    Joined: Sep 2007
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    Location: SF bay

    Squidly-Diddly Senior Member

  9. BertKu
    Joined: May 2009
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    Location: South Africa Little Brak River

    BertKu Senior Member

    I had a good laugh. I see the 4/5 guests already hanging on the rope at the back.
    In all seriously, those flying dolphins in Greece / Croatia / Italy does a distance of 50 Km in a half hour. There must be boatbuilders who are making smaller versions.
    Bert
     
  10. Squidly-Diddly
    Joined: Sep 2007
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    Squidly-Diddly Senior Member

    I think the Flying Inflatable would carry 4-5 on the water if you

    take off the wing and install normal outboard.

    I'd imagine they could take at least 4 people for a taxi on the water.

    Just keep clear of the prop.




    I wonder how they would do as "ground effect" with higher than their rated 450lb payload.


    I wonder if high speed taxi with hull 'kissing' the wavelets and considerable but insufficient lift would be safe or dangerous.
    Specs say "10,000ft ceiling" but I'm not sure if that is with 450lb.
     
  11. jim lee
    Joined: Feb 2007
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    jim lee Senior Member

    The rule I was taught was "Never fly in an aircraft that uses shifting weight to control." Too easy to get in trouble and fall out of the sky. Maybe a Flying Dolphin with a "real" wing and ailerons?

    -jim lee
     
  12. CatBuilder

    CatBuilder Previous Member

    In any event, he'd be shot out of the sky as he approached the George Washington Bridge in an ultralight.
     
  13. BertKu
    Joined: May 2009
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    Location: South Africa Little Brak River

    BertKu Senior Member

    A flying Dolphin is the nickname for the ferries they using in various parts of the world, which lift itself about 1 meter above the waves and does aceptable speeds.
    Bert
     
  14. whitepointer23

    whitepointer23 Previous Member

    what about a hydrofoil. years ago i looked at one that was being used for commuting as well. it was on the bay in melbourne, much rougher than hudson river. it was 30 ft long, fully enclosed with a cockpit like an aircraft. twin volvo diesel stern drives with leg extensions. really cool. cruised at 60 knots.
     

  15. BertKu
    Joined: May 2009
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    Location: South Africa Little Brak River

    BertKu Senior Member

    My apology, A flying Dolphin is a Hydrofoil. I fully agree with you
    Bert
     
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