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Type: Posts; User: MN Dave

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  1. Re: Wood - Plywood - Epoxy bond, re-building my ketch Tonga

    The math for paints stiffening the strips isn't what you would expect. Wood is a lot stiffer than varnish or epoxy, and the added thickness, 0.025mm, on each side of 6mm works out at maybe 1%...
  2. Re: Wood - Plywood - Epoxy bond, re-building my ketch Tonga

    After rereading the OP
    One layer of plywood, held only with nails and it lasted 57 years? It may be best to allow the planking under the plywood sheathing to work as it shrinks and swells by not...
  3. Re: Wood - Plywood - Epoxy bond, re-building my ketch Tonga

    I found the threads I was thinking of.
    http://forum.woodenboat.com/showthread.php?202830-Bowdidge-style-strip-planking...
  4. Thread: Boat Shed Loft

    by MN Dave
    Replies
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    697

    Re: Boat Shed Loft

    Collar ties are only redundant when there are ceiling joists to take the thrust load at the bottom end of the rafters. The rafters will want to push the walls outwards when there is a snow load on...
  5. Re: Wood - Plywood - Epoxy bond, re-building my ketch Tonga

    Have you tried this test on a board treated with the linseed oil and preservative the same way you treated the new planks?

    There was a thread here in the last year about a boat builder who...
  6. Re: Bolting fittings to plywood cabin to avoid water intrusion.

    There is an automotive product that is similar and looks to be available on your side of the planet. Permatex #2 is a mix of clay, rosin and castor oil thinned with alcohol whereas Dolphinite is a...
  7. Re: Bolting fittings to plywood cabin to avoid water intrusion.

    Dolphinite USED TO contain a fungicide. There isn't anything listed on the MSDS that kills fungus, and there isn't much of anything that kills fungus that isn't hazardous enough to be required on a...
  8. Re: I have a forty year old teak over ply deck. It's not bad. But, seriously...

    Two part polysulfide is available from aircraft suppliers. The most likely one for this application is AMS-S-8802 Sealing Compound, Temperature Resistant, Integral Fuel Tanks and Fuel Cell Cavities,...
  9. Thread: Shop floor.

    by MN Dave
    Replies
    52
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    3,160

    Re: Shop floor.

    6 feet of muddy water will be fun to clean up after. In this picture: ASF barge there is a two story timber frame shop and office on a very simple steel frame barge similar to a swimming float with...
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    Re: What is an OST nut or coupler?

    When you coat threads, the coating changes the effective diameter by four times the coating thickness, so you need oversized threads. Not that I knew they were called OST, but it makes sense. ...
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    Re: Detail for Crime Fiction

    If you don't want anyone to see the patch, use hide glue. :D My daughter the recently minted luthier figures it should let go pretty quickly.

    PVA is also worth a shot, never ignore Peter's...
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    Re: Diesel fuel sludge questions

    Fungus?
    https://www.practical-sailor.com/issues/35_7/features/Diesel-Biocides_5800-1.html
    http://www.bp.com/content/dam/bp-country/en_au/media/fuel-news/fungal-contamination-diesel-boats.pdf
  13. Replies
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    Re: Please complete this diagram...

    Google-fu expertise disclaimer. I don't know jack about this.
    This company looks like it might be able to help: http://www.tadiesels.com/index.html

    I read H/EX as heat exchanger, not exhaust. ...
  14. Thread: Shop floor.

    by MN Dave
    Replies
    52
    Views
    3,160

    Re: Shop floor.

    Bummer! Having worked on both wood and concrete, concrete is a PITA.

    Like Hugh, I have a concrete shop floor and a budget. Add to that a poorly graded class 5 limestone gravel driveway and the...
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    Re: An iron keel issue

    Devcon Z was a good idea, but it appears to have been discontinued.

    http://www.devcon.com/ does not list it anymore, but the old (2004) MSDS is still around.

    The best replacement would be...
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    Re: Gaff Thrust and the Hollow Spar

    Spruce: A Colorado blue spruce mast would be a surprise, but you never know. I did find one site calling white spruce (Picea glauca) blue spruce, but it was the only one. Oh well, common names can...
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    Re: Mast inspection questions

    Fitting graving pieces with routers: https://www.youtube.com/watch?v=kZpp9ym_6yQ
  18. Thread: Neat Idea

    by MN Dave
    Replies
    8
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    1,090

    Re: Neat Idea

    This does a bit better on land, but I still wouldn't call it heavy duty:
    https://www.youtube.com/watch?v=ZStHFnAudL4
    This is heavy duty:
    https://www.youtube.com/watch?v=l94arUeh1XI
    But they...
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    1,481

    Re: Gaff Thrust and the Hollow Spar

    You only loose a fraction of the theoretical strength in bending. Since the outside of the cylinder is supporting almost all of the bending loads, the core is mostly along for the ride. There are...
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    Re: "Faering" for singe rower: hull proportions

    Bump!


    Did I miss a thread in which you described the design you settled on?



    Gerrie Warner still sells plans for the Årby Gård Viking canoe. The website with contact information is...
  21. Replies
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    Re: Split in solid mast-Alden 21 double ender

    OK, so the chain saw wasn't the best idea. It could clean out the crud and recontaminate with bar oil. Steve's suggestions are good. I.e. handsaw and have a good look at the wood. Short of removing...
  22. Replies
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    Re: Split in solid mast-Alden 21 double ender

    In the picture on the left, there are some light spots along the crack that look a bit like reflections. Is that is actually light shining through the mast? Wow. Holy (insert expletive of choice...
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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.
    ...
  24. Replies
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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...
  25. 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...
  30. Replies
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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...
  31. Replies
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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.
  37. Replies
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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.
    ...
  38. Replies
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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:...
  41. Replies
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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...
  42. Replies
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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%,...
  43. Replies
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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...
  50. Thread: Form Ply?

    by MN Dave
    Replies
    6
    Views
    739

    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...
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