Simple aluminium design

Discussion in 'Boat Design' started by SilverMack, Aug 11, 2014.

  1. SilverMack
    Joined: Jul 2014
    Posts: 9
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Aberystwyth

    SilverMack Junior Member

    Hi, this a small craft that can unbolt and stack neatly into a third of its footprint. Key feature is cost and simplicity. Dims 16 ft oal 5ft beam, height under 3 ft. Mtl is 2mm. Weight 110 kg

    Intended for offshore fishing. Comments appreciated.
     

    Attached Files:

    Last edited: Aug 11, 2014
  2. DCockey
    Joined: Oct 2009
    Posts: 4,885
    Likes: 425, Points: 83, Legacy Rep: 1485
    Location: Midcoast Maine

    DCockey Senior Member

    Why not a curved bow?

    How thick will the plate be? Any framing between bulkheads?

    How far offshore? What sea state and weather conditions?

    Propulsion?
     
  3. SilverMack
    Joined: Jul 2014
    Posts: 9
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Aberystwyth

    SilverMack Junior Member

    Hi, thank you for your reply. Could do a curved bow. How important is it do you reckon? I wasn't sure on a craft this size it would make much of a difference.

    Material is 2mm throughout. Each compartment is self contained so bulkhead thickness except transom is 2x2mm. No frame inside except 2 longitudinal angles welded back to back above the inverted keel apex. Each hull section is folded in 1 piece with welding only at the bulkheads. Bow is more complex.

    Power plant probably a 25hp outboard. Hope to take it a mile or Twp out to sea in calm to fair conditions.
     
  4. upchurchmr
    Joined: Feb 2011
    Posts: 3,116
    Likes: 170, Points: 63, Legacy Rep: 579
    Location: Ft. Worth, Tx, USA

    upchurchmr Senior Member

    The curved bow will be very important.
    You are going to need big fittings at the deck joints to handle the loads, and you are going to need reinforcement at the deck line (gunwale). Without it the first (or second) wave you hit will buckle the gunwale and fold this thing up like tinfoil.

    Have you thought about how big the bolts will be to put it together?

    Do you really mean each section would float on it's own?
     
  5. messabout
    Joined: Jan 2006
    Posts: 3,128
    Likes: 294, Points: 83, Legacy Rep: 1279
    Location: Lakeland Fl USA

    messabout Senior Member

    Offshore??? In such a boat, your offshore excursions should be absolutely limited to 10 meters offshore or some distance that you can safely swim.

    There have been numerous boats that are segmented such that they can be broken down into smaller pieces. You must not underestimate the forces involved at the matching bulkheads of the boat. The joining bulkheads will need to be at least 6 or 8 mm in thickness and then carefully braced and reinforced.

    You show no flotation chambers at all. If this boat is swamped it will sink like a rock.

    No personal affront is intended here. Unfortunately the boat that you have drawn is a suicide boat that could never be approved by boat licensing authorities.
     
  6. PAR
    Joined: Nov 2003
    Posts: 19,133
    Likes: 479, Points: 93, Legacy Rep: 3967
    Location: Eustis, FL

    PAR Yacht Designer/Builder

    I don't think licensing is his intent, but I agree in everything else you've said Messabout. Considering his location and presumed "off shore" areas, this size and general dimensioned craft is grossly unsuited for anything but protected waters (ponds, lakes, small rivers and bays, etc.) and nothing remotely off shore. He would be best advised to rent or borrow a 16' boat and head off shore on a nice day. If he doesn't get overwhelmed by the sea, a valuable lesson about little boats and a big sea will be had. This has all the earmarks of an inexperienced skipper, with minimal budget and unrealistic hopes.
     
  7. DCockey
    Joined: Oct 2009
    Posts: 4,885
    Likes: 425, Points: 83, Legacy Rep: 1485
    Location: Midcoast Maine

    DCockey Senior Member

    The original poster explained what in meant by offshore in post #3:
    Hope to take it a mile or Twp out to sea in calm to fair conditions.​
     

  8. messabout
    Joined: Jan 2006
    Posts: 3,128
    Likes: 294, Points: 83, Legacy Rep: 1279
    Location: Lakeland Fl USA

    messabout Senior Member

    A mile or two is a long way to swim, especially if there be dragons.
     
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.