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Type: Posts; User: MN Dave

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    Re: Rogue waves & yacht design

    So I'm thinkin' gee that sounds like a soliton. But other than smoke rings, I can't put my finger on how it would work, so I googled it. Still don't know.
    ...
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    Re: Rogue waves & yacht design

    Ian answered the question. The rogue is not one wave, it is several waves adding up when they all pass the same place at the same time. All of the smaller waves continue on. Sometimes several waves...
  3. Re: Advice on Storage of our Carvel Plank Boat - ashore for long term

    +1
    Borax and borates are excellent at preventing rot, mold and insect damage, but don't swell wood very much. While maintaining a steady high humidity will keep the wood from shrinking, it takes...
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    Re: Converting sheet plywood to strip planking

    The need for and problems associated with sheathing are a matter of scale. Your designs are predicated on FRP reinforced wood strip, and it looks like you have it nicely dialed in. The OP seemed to...
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    Re: Converting sheet plywood to strip planking

    There is strip built from thin strips held together by glass (usually small boats and conoes) and there is strip built from thick strips held together with edge nails.

    Thin strips held together...
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    Re: Help identify this wood?

    +1

    The whole point of asking on a forum is to make an educated guess. The lab is a last resort, even if its existence and address is a small part of the education sought.

    Latin names are...
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    Re: Help identify this wood?

    Brazilian Mahogany from "Mahogany Mixups: the Lowdown" (red link above)
    It’s sold under a variety of common names, including American Mahogany, Genuine Mahogany, Big-Leaf Mahogany, and Brazilian...
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    Re: Bronze toxicity?

    While we are flaying the horse's carcass, we might as well mention that:

    We are talking about too much of a good thing:
    http://www.medicalnewstoday.com/articles/263176.php

    Galvanizing fumes...
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    Re: 3M 4200 Carvel planked joint seams

    I do not disagree with anything that you said, but I think that you may have misunderstood the fine details that I glossed over because it is a long winded explanation that will bore most of us to...
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    Re: Bronze toxicity?

    Your question was clear enough. The answers were also unanimously saying that there was nothing to worry about.

    If there was some confusion in the answers it was the detail that was added to...
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    Re: Converting sheet plywood to strip planking

    Good point, but if you are looking at douglas-fir plywood, you have a choice between checking and glassing. So with DF, you still have the labor-intensive, time-consuming, adhesive-intensive job of...
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    Re: 3M 4200 Carvel planked joint seams

    There is a difference in the way cotton caulking and an elastomer compress.

    When a chunk of 3M 4200 is compressed, it bulges. The volume stays the same, so to compress, it has to go somewhere....
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    Re: Bronze toxicity?

    If the story is true, the star must have been brazed to the stove with brass filler metal, and the exposure was only during that operation. As the others have said, it happens mostly during melting...
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    Re: Bronze keel bolts through an iron Keel

    Of course it will clog. Unless...

    I have used grease to capture chips where loose chips were a problem. I'll admit that the magnet idea won't work.
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    Re: Bronze keel bolts through an iron Keel

    Insulators are often rated in hundreds of volts per mil, so to stop less than half a volt will take a thin layer of tar or paint. I don't think insulating the washer is that much of the problem.
    ...
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    Re: life expectancy of some wood fence posts

    Trouble with a long term study, from the 1996 update:
    Chemicals Used as Preservatives
    The following compounds have been used, with various degrees of success, to preserve the test posts. In many...
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    Re: Bronze keel bolts through an iron Keel

    While most fasteners in wood construction are loaded in sheer, I think that for the keel the shear load is taken up by the friction due to the clamp load. I would be very surprised to find that any...
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    Re: Help identify this wood?

    Two sites that might help:
    Disambiguation:
    http://www.wood-database.com/wood-articles/mahogany-mixups-the-lowdown/
    You can have too many pictures:...
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    Re: Bronze keel bolts through an iron Keel

    The OP described uncorroded bronze bolts in an iron keel with bedding compound on all but one. There were problems in one floor, which have yet to be fully investigated. (A little scraping and a...
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    Re: Edge glued mahogany carvel planking

    The Scandinavian technique sounds interesting. I have to try it.

    All wood swells. Have a look at http://www.wood-database.com

    Atlantic White Cedar,
    Shrinkage: Radial: 2.9%, Tangential: 5.4%,...
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    Re: Bronze keel bolts through an iron Keel

    So iron bolts are better in an iron keel? I don't understand. Based on what I see, but not much of what I read, the bronze looks much better.

    Galvanic corrosion happens under water. Not always...
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    Re: Picture posting woes

    The issue is not whether you can link easily to a third party image on the web, nor is it that you can link to your own stored images on an image hosting site. The problem with the third party sites...
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    Re: Bronze keel bolts through an iron Keel

    First, I can not claim to know more than Bruce about building a boat. (OK, and Nick, Garret, and a long list of others reading this:rolleyes:) This is not the first time that he has mentioned...
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    Re: Bronze keel bolts through an iron Keel

    I don't see a galvanic issue for bronze keel bolts bedded in (I'm guessing white lead and linseed oil) so the contact between the iron, bronze and water is minimal. If I understand the OP...
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    Re: identifying screw alloys?

    +1
    Ah, a practical approach. Boring, but practical. I can't think of anything more exciting than testing 190 lbs of screws one at a time.
    ...
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    Re: Using West epoxy over CPES in a repair

    +1 ALL of the above.

    CPES is (and I am not a fan) a decent primer. Let it dry before applying the resin. As David G. said, you don't want to trap the solvents. Nor do you want to bury the rot,...
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    Re: Simple Guideboat Portage Question

    The yoke (1) is secured in the yoke cleat (2) with a leather strap (3). You can lift the boat with one end on the ground to reduce the weight that you are lifting. (4) start toward the front a ways...
  28. Thread: Form Ply?

    by MN Dave
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    Re: Form Ply?

    Bob has a good point. As a materials wonk, I do hate to encourage traditionalists too much though. Surely some new materials have worked out over the years. I also share David G and Al G's concerns...
  29. Re: Sanding graphite coating in daggerboard trunk?

    I have seen a number of posts about graphite for abrasion resistance, but not much detail as to how much graphite to add. The proportions of filler to resin will make a difference. Too little filler...
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    Re: Picture posting woes

    As far as I know (not very far) the past images are links that would not change. The text includes HTML code that is not displayed.

    The code that tells the computer to display an image is IMG in...
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    Re: 2 ?'S. Rust removal by electrolysis.

    $1000? That seems to be about $930 more than the kit here:
    http://www.brownells.com/gunsmith-tools-supplies/metal-prep-coloring/metal-bluing/liquid-cold-bluing-chemicals/index.htm

    10 amps for...
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    Re: Recipe for Six10 thickened Thixo epoxy?

    :d



    West has a lot of experience coating wood. They are not experts at coating steel. If there is nothing on the metal surface that inhibits corrosion, the rust will work its way under the...
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    Re: Plywood horrors & testing?

    Why not call Homestead and ask if they can provide a C of C? While they may not have lot control at the yard, they may have records that show that they buy certified material. At least they should...
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    Re: Flood preparation boats .

    In an existing structure, if you have the ceiling height to work with, I would consider building a 'floating dock' that fills the room. In other words, build a detached floor filled with EPS foam...
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    Re: Recipe for Six10 thickened Thixo epoxy?

    Primer? Adhesion and corrosion are two different animals. rust will eat it's way under the epoxy just like those expanding circles of rust on an old car. When I used a rust converter on the sand...
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    Re: Recipe for Six10 thickened Thixo epoxy?

    The safety data sheet for 610 says it contains >1% powder that is a nuisance dust and not a hazmat. They also describe thixotropy badly. No magic, just lots of Cab-O-Sil.

    The mumbo jumbo adds up...
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    Re: Douglas Fir Again

    I wouldn't use it in a chicken coop, at least not without feeling guilty for having wasted it. I found a pic in http://www.hobbithouseinc.com/personal/woodpics/fir,%20douglas.htm that shows similar...
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    Re: Mildew/Mold Treatment for Deck Canvas

    For information only:

    Vulkem is a polyurethane coating that comes in several dozen flavors. Hard to say which one to use. http://www.tremcosealants.com/products/search.aspx

    It sounds a bit like...
  39. Re: If a plan is enlarged 10%, what about sail area and ballast?.....

    So, what he said was that you can sail a really big ship with a hankie? Perhaps just lengthening it increases the hull speed and decreases righting moment?

    The following inexpert ramblings may...
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    Re: Mildew/Mold Treatment for Deck Canvas

    That is the reason that white lead has been so hard to replace. It plasticizes linseed oil. (No argument with the post.)

    Not to disagree, but to offer an alternative: There was a wood and canvas...
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    Re: Filler below the waterline

    Epoxy fillers are fine on wood surfaces, but not seams. Seams work and the filler will crack. Fasteners with wood bungs can be removed. You can't get a driver in an epoxy filled screw head without...
  42. Thread: Plywood

    by MN Dave
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    Re: Plywood

    John has a good idea to cut weight with the foam center. 3/8 ply on top and 1/4 on the bottom with an inch of XPS foam between them would be strong enough to stand on. It sounds like this table will...
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    Picture posting woes

    This is far from an isolated incident. When the Forum was new, a terabyte cost a lot more than it does today. Why can't Woodenboat support a group that consists largely of paying subscribers ...
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    Re: Mechanic gloves

    +1 Deerskin is nice. If you aren't dealing with wet or chemical messes, they are hard to beat.

    John's nitrile dipped gloves are the type I usually use.
    3/4 dipped nitrile on jersey are cheaper...
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    Re: Dad messed up...again- HELP!!!

    It depends on how long the muriatic acid (hydrochloric acid) was on the stainless and how deeply it was pitted. Same thing.

    First thing I would try is the Barkeepers Friend, (post #6) which...
  46. Re: Do we go overboard with the use of epoxy as a sealer?

    You can get away with a lot when painting 1000 and 5000 series aluminum. Maybe 3000 too, somewhat less with 6000, but you have to do a much better job on 2000 and 7000. When you have to protect 2219...
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    Re: Rust proofing after cutting threads

    The reason for a rust inhibiting primer is that if there is a scratch that exposes bare metal as is likely on a thread tip, a plain epoxy will not prevent the corrosion from working its way under the...
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    Re: Best Way to Lay Glass on Lisa B Good

    While you can take almost everything either Todd or Gib has to say to the bank, this is one of those rare instances where one of them is wrong. For a certain value of wrong. I would say that Todd...
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    Re: Rust proofing after cutting threads

    Yes. Lanolin is good. One brand name to look for is Fluid Film.

    The thickness of a coating such as galvanizing or plating (zinc plating is useless) will change the pitch diameter by 4 times the...
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    Re: Best Way to Lay Glass on Lisa B Good

    The cloth is very easily distorted, which is a good thing when covering compound curves. For precise fitting on large, straight flat surfaces, it can be difficult to keep straight. You might find a...
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