anchor or mooring depth

Discussion in 'Boat Design' started by nimblemotors, Mar 13, 2012.

  1. Submarine Tom

    Submarine Tom Previous Member

    Then I'll fit right in.

    Eventually...

    Now Nimble, how are you coming with those conversions

    -Tom
     
  2. hoytedow
    Joined: Sep 2009
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    hoytedow Carbon Based Life Form

    Jack be nimble,

    Jack be quick,

    But Nimble's got a knot in his,

























    anchor rode.
     
  3. Submarine Tom

    Submarine Tom Previous Member

    TFF!

    Do tell, do these just come to you or do you spend hours in the shower coming up with them?

    -Tom
     
  4. hoytedow
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    hoytedow Carbon Based Life Form

    According to the timeline between your previous post and my post following yours it took maybe 120 seconds.

    I guess they just come to me.
     
  5. jehardiman
    Joined: Aug 2004
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    jehardiman Senior Member

    Sigh, why is this sooooo hard. You should realize by now that you are looking for an answer that has no question. You might have well ask what is the average volume of buildings with doors were people live and work, a very similiar question, as the volume of the building is more about what is done there than the people using the doors. Even the size of the doors is dependent on the building use, as a igloo is very different from the NASA VAB.

    Anchorages are the same way, mooring depth has nothing to with an average boat and everything to do with the location. If you want to moor somewhere, you either do it or not depending on the tackle you carry.

    I tried to give you a bit of history about anchoring and the reason behind the limits and I hoped that informed you might have had an epiphany that the answere to your question was "It all depends on the amount of rode you carry". Some one with 20 feet of rode anchors in 3 ft, some one with 200 ft anchors in 30. Then you might be able to make the cognitive leap that the average mooring depth for a given class of vessel is dependent how much rode they carry and the amount of rode they carry is dependent how much depth under the keel they are comfortable with which drives the depth of the anchorage which leads us back full circle into how much rode do you need.

    So boats moor where that have good enough tackle, and they have enough tackle because that were they need to moor.

    Now if you were to ask how much rode would be recommended for a 12' john boat or a 65' seiner that draws 8 feet, we could give you a direct answer. Or if you asked the average depth of non-commerical harbors in the BVI's. Or do you even moor in certian place in Lake Superior? But as the question was phrased, there is no good answer.
     
  6. hoytedow
    Joined: Sep 2009
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    hoytedow Carbon Based Life Form

    Which makes me the dumb one for trying to answer it. :rolleyes:
     
  7. michael pierzga
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    michael pierzga Senior Member

    A fully found ,world cruising sailing yacht needs 100 meters of chain...no more, no less.

    I prefer oversize anchor, minimium chain diameter.
     
  8. nimblemotors
    Joined: Jun 2009
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    nimblemotors Senior Member

    My question was about the depth of water, it wasn't about anchoring or the size of the boat. I don't understand why that is so hard to understand,
    except that some (e.g. Cat) try to be helpful and re-interpret the question as something they think I am asking, while others just mock the question. If one can find 20ft of water near most marinas, the answer is 20ft. "most" I suppose is too hard a question to answer, then one might say in the sea of cortez, 10ft depth is easy to find, or in the sfbay, 6ft is easy to find, etc


     
  9. bntii
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    bntii Senior Member

    Reading the thread still a bit confused myself- why do you want to know?
    Are you setting up a boat for anchoring and need to size gear?
     
  10. nimblemotors
    Joined: Jun 2009
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    nimblemotors Senior Member

    Will my submarine will go undetected and remain submerged when moving it through marinas and how high my periscope must go to reach the surface. OK?
     
  11. pdwiley
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    pdwiley Senior Member

    That's because it's a stupid question and if you haven't realised this by page 4 of the responses, you are unlikely to ever manage it.

    There *is* no answer.

    Not only that, the question is irrelevant as your ability to anchor somewhere is a function of the amount of water your boat draws, the exposure of the anchorage, the holding efficiency of the bottom and the amount of anchor rode/weight/design of anchor(s) you carry.

    Happy now?

    PDW
     
  12. Submarine Tom

    Submarine Tom Previous Member

    OHHHHHH A submarine, well I'm glad I was able to help out then.

    Now, about those conversions...

    -Tom
     
  13. Milehog
    Joined: Aug 2006
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    Milehog Clever Quip

    How long do your legs have to be? :p
     
    1 person likes this.
  14. jehardiman
    Joined: Aug 2004
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    jehardiman Senior Member

    Oh, why didn't you say so instead of getting mad at answers to a very open ended question. If that is really the case, then that's an easy one. I can go look up most of the equations for you tomorrow. It is in most papers on submarine stability derivitaves. Classicly you would use Gertler (67) or Fieldman (79). Do you know what confidence level you want for collision avoidance?
     

  15. WestVanHan
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    WestVanHan Not a Senior Member

    A joke-right?
    Or moving some kilos,hence the need to be undetected?

    It'll work until the first time you get fouled in someone's gear,which is likely the first day.
     
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