Designing Boom & Mast For Boat

Discussion in 'Boat Design' started by MOBY95322, Mar 23, 2009.

  1. MOBY95322
    Joined: Mar 2009
    Posts: 1
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    Location: Friday Harbor, Washington

    MOBY95322 BOOMER

    I want to add a boom and mast to my trawler. I have been searching for help and have come up empty handed every where I go. Can anyone send me into the right direction or come up with some ideas for a boom to pick-up dingy off board and new location for radar. I also want to add an electric winch system.:confused:
     
  2. TeddyDiver
    Joined: Dec 2007
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    Location: Finland/Norway

    TeddyDiver Gollywobbler

    Some pictures could help :)
     
  3. peter radclyffe
    Joined: Mar 2009
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    Location: europe

    peter radclyffe Senior Member

    make the boom length half the beam of the trawler at that point on deck, plus half the beam of the dingy plus about 2 feet, if tumblehome add that,this is minimum, mock up with sticks & string or scale rule to clear the gunnel, determine your gooseneck height & put your peak lifting block on the mast on the hounds above the booms length, the diameter of the mast is about 7/8ths of an inch per foot, to an inch per foot of trawlers beam,beef up all your fittings, stays, vangs, work out your block purchase with various blocks, to a winch, build ultimately for the worst case scenario, i.e, the weakest member of the crew when tired has to get the boat on board when it's heaviest when wet, & the power is down so pulley blocks by hand, dont worry if it looks too strong it may save your life
     

  4. peter radclyffe
    Joined: Mar 2009
    Posts: 1,419
    Likes: 64, Points: 58, Legacy Rep: 680
    Location: europe

    peter radclyffe Senior Member

    mast dia at hounds is about 7/10ths of mast at deck, if you have lifelines above the gunnel, you can have an opening section with quick release wires, you can mock up a body section of the dingy in ply ,full size & trial run it over the rail on a mock boom till your happy with all sizes, build 2 chocks on deck or coachroof for stowage, shaped to hull, with 4 strong eyebolts one on each quarter, cover with leather or rubber seating, ask a rigger for sizes or buy , the riggers handbook by brion toss or gaff rig by john leather, or any good rigging book, in the dingy have 2,3 or 4 lift points to a central bridle, to one lift point, use your painters for control, one purchase at houns, one purchase on boom end , pull in line with boom
     
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