Can someone direct me to get patterns for cuts on a vbow aluminum boat?

Discussion in 'Boat Design' started by josahall, Oct 13, 2015.

  1. messabout
    Joined: Jan 2006
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    Location: Lakeland Fl USA

    messabout Senior Member

    As a matter of fact there is real expertise here. You apparently have no idea who you are talking to. This forum has members who are some of the worlds most competent designers, builders, and boatmen, most of whom are generous with their advice and council.

    For the record: I do not presume to be one of those world class participants. I do have more than a casual set of experiences with boat building.

    Here is a small bit of information that you may find helpful................You have indicated a beam of 7 feet and a chine width of 5 feet which implies generous flare (flam if you prefer that term) The side panel of the boat will be shaped like a scimitar which will use more material than you might have bargained for. The bottom panel near the bow will also have some curvature.

    David; your point is well taken and so is Pars point which wisely suggests buying a set of plans for an established and proven design. It is a sure thing that 100 bucks for a set of proven plans is a better bargain than the risk of trashing a $300 sheet of aluminum. A sheet of 16 gauge at 18 ft x 5 ft will weigh about 81 pounds. The current scrap rate is about 55 cents per pound. The ruined sheet is worth less than $50 at the scrap yard. To be fair, aluminum sheet can be butt welded so the panel will not actually be rendered worthless, however inconvenient.
     
    Last edited: Oct 15, 2015
  2. PAR
    Joined: Nov 2003
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    Location: Eustis, FL

    PAR Yacht Designer/Builder

    Yeah, I get the impression Southerntidefan and the OP aren't the same poster. The OP has a clear lack of the necessary understanding, in material attributes, engineering and the hydro side of things. Southerntidefan may have some fabrication experience, though this isn't sufficient compensation, for the way developed surfaces are generated. Welding sheet can be a big help as to what can be done, but what shapes to employ and where along the hull should they employed, for the performance envelop envisioned, will it float as anticipated, etc., does seem a bit out of his range.

    The basic questions still remain; what about this envisioned new design, is so different from what's currently offered, that a new design is necessary? 17' LOD with a 5' WL beam on a 7' beam is a bit narrow, but not that unusual, as it's about what most jon boats are, though these particular dimensions will produce a good bit of topside flare, certainly not unreasonable. The narrow WL beam will help lower the power requirements for a given speed target, but most of these things need to be justified, at least rudimentarily. Weights and sufficient structure would be my next concern, given the hull material choice.

    Lastly, some simple cuts in chipboard (the stuff found on the back of a note pad) will quickly show what shapes work and which don't. As to the compindance of the posters here, plainly he's not read or seen much on this site yet, as this level of arrogance, just can't be justifiable in any regard, if he had this site experence.
     
  3. HJS
    Joined: Nov 2008
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    HJS Member

  4. PAR
    Joined: Nov 2003
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    Location: Eustis, FL

    PAR Yacht Designer/Builder

    It's one thing to make pretty pictures with modern software, but another to employ shapes well suited to the boat's SOR, not to mention the hull shell's supporting structure, particularly if using aluminum. The only reason to choose aluminum is to save weight, as cost and assembly ease can't be very high up on the list, not to mention penetration resistance and several other considerations. Simply put, there's no free lunch, even with free design software, you have to understand what's going on, across several disciplines or you're just drawing pretty boat shaped pictures.
     

  5. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    I'd have thought the sheeting of the bottom forward would present the same or greater problems, but it does not get a mention. Strange query.
     
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