Anchor size

Discussion in 'Boat Design' started by rasorinc, May 11, 2013.

  1. rasorinc
    Joined: Nov 2007
    Posts: 1,854
    Likes: 71, Points: 48, Legacy Rep: 896
    Location: OREGON

    rasorinc Senior Member

    Got all my frames placed on the jig and will post pics soon. Boat is 30'-06" x
    8'-6" and I estimate finish loaded weight to be 3,000lbs to 3,300lbs. I have no idea how to determine anchor size. Mainly used in lakes and rivers and some close in ocean excursions off the Oregon coast. Any and all assistance will be greatly appreciated. Boat is a planing hull V shaped. 4/12* to 7/12*
  2. JSL
    Joined: Nov 2012
    Posts: 811
    Likes: 64, Points: 28, Legacy Rep: 41
    Location: Delta BC

    JSL Senior Member

    go to an anchor web site- they have the formulas.
  3. philSweet
    Joined: May 2008
    Posts: 2,591
    Likes: 361, Points: 83, Legacy Rep: 1082
    Location: Beaufort, SC and H'ville, NC

    philSweet Senior Member

    Having trouble visualizing what you are building. Weight seems low by a factor of 2.5.
    I carried about 500# of ground tackle on my 28 footer, but I come from hurricane country and the boat was expected to mind for itself. A pair of 200hp outboards is 1000#. Fuel and controls another thousand minimum. Electrical distribution and batts about 400# Plumbing and tankage similar. That happens to be 3300# and we don't have a hull yet. Or people.

    Looking at this another way, four people could easily weigh 1000#. 160 gal fuel weighs about 1000#. 30 gal water, 100qt ice, and snacks, bait, and dufflebags weigh 500#. I carry about 200# of tools along. That's 2700# of stuff that shows up for a day trip, and the beer hasn't been figured in yet. So I'm a bit confused. You have a DLR of 50ish in operational trim.

    A Stamas 289 has an advertised dry weight of 6700# .

    I've paddled canoes that weighed 3000#. 28' long and near 5' beam.
  4. 805gregg
    Joined: Apr 2010
    Posts: 57
    Likes: 1, Points: 0, Legacy Rep: 20
    Location: Ojai, Ca

    805gregg Junior Member

    Bigger is always better and lots of chain, to keep the pull horizontal

  5. JSL
    Joined: Nov 2012
    Posts: 811
    Likes: 64, Points: 28, Legacy Rep: 41
    Location: Delta BC

    JSL Senior Member

    Secret is to make sure you have lots of catenary. The best I have used is all chain but if you have chain/rope use a kellet and as much scope as you can. 3:1 absolute minimum, 8:1 in heavy weather.
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.