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Type: Posts; User: MN Dave

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  1. Replies
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    Re: Rust removal from stainless

    Thanks, Gib.

    Passivation is the removal of any stray bits of steel or similar contamination from the surface of the stainless. Any cutting or grinding will leave embedded particles that will...
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    Re: Theremo-electric energy recovery

    There are different temperature range materials for thermoelectric generators according to the link on my earlier post. You may need to match the chips to the heat source. I don't know much about the...
  3. Re: Wood - Plywood - Epoxy bond, re-building my ketch Tonga

    You mentioned sealing and rivets popping.

    The rivets on the Titanic may have failed because they were cold. Steel and iron that is very tough at room temperature can become brittle near 0C and...
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    Re: Rust removal from stainless

    Parkerizing, a phosphate coating will probably be removed by anything that will remove rust.

    As Kevin said, the stainless is probably heavily pitted, and nothing short of grinding out the pits...
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    Re: Theremo-electric energy recovery

    It sounds like you are looking at a thermoelectric generator, not a thermopile. The Powerpot appears to have a thermoelectric generator. With any luck, the keywords will help in a Google search....
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    Re: Hatch that Doesn't Need to be Opened Often

    There is a sealing tape that forms a flat gasket between fairly smooth surfaces that might allow you to design a seal with next to no dead space to collect water. It is tacky, but the hatch will be...
  7. Re: Confessing corrosion confusion... bobstay fittings.

    Will you seal the line with some 3M 4200 or similar?

    I got thinking about the leverage that adds up to the rather large loads that the bobstay is subjected to. If I am not mistaken (again), the...
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    Re: An Iceboat, with wing-sail maybe?

    Wingsails on iceboats:
    https://www.youtube.com/watch?v=qltwydZHmX0
    DN plans: http://na.idniyra.org/about/specifications/
    General wingsail information:...
  9. Thread: Pool noodles

    by MN Dave
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    Re: Pool noodles

    It's all pricey. Do the math on the noodles.
    Walmart 2.5" with 1" hollow, 5 each, 52" gives you 0.62 cubic feet for $15.28 comes to $24 per cubic foot.
    The 3 pack of solid 2.5" x 60" comes to...
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    Re: Duplicating Dagger Board in Wood?

    Dave (Woxbox) has a very practical answer. If there is enough slop in the slot, you could glass the daggerboard to reinforce it some. You will thicken it by at least 1/64 inch per layer of 6-10 oz...
  11. Re: Wood - Plywood - Epoxy bond, re-building my ketch Tonga

    Take care of that shoulder! You have my sympathy. This concludes the useful portion of this post.

    I haven't commented in a while since there isn't much that Nick and company haven't covered. I...
  12. Re: What type of boats are the "Disneyland Jungle Cruise" boats?

    There were two models sold over the years, one by Atwood Steamcraft and one by Master Modelers. Both look like the original design before the wheels were added. But, yes, a good design for use on...
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    Re: Compass vs Electric auxiliary?

    It is possible to shield the compass from the magnetic fields coming from the motor and cables with low carbon steel sheet, which is basically fairly pure iron. I'm pretty sure hot rolled will do...
  14. Thread: Pool noodles

    by MN Dave
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    Re: Pool noodles

    Forget noodles. Poor shape for packing. Sheet is easier to use to fill volumes.

    Having said that, cylinders (noodles) go for ~$21/cubic foot here: EDIT $44 oops.:mad:...
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    Re: Grumman Sportboat

    Cleco? What? Oh... http://www.panamericantool.com/cleco-fasteners.html Cool. Found a sheet metal tool list while looking up Clecos.

    Nice work. Looks like you scuffed the metal around the patch so...
  16. Re: Confessing corrosion confusion... bobstay fittings.

    I have to agree with Ian that saving weight with a composite fitting is pointless. Fabricating a composite part is well within the capabilities of most of us, although understanding the load paths...
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    Re: wood for spreaders

    What Jay means by saying flexible is that for a given stiffness, the high strength allows ash to bend more before it breaks. Since the design is probably more stiffness driven than strength driven...
  18. Re: Confessing corrosion confusion... bobstay fittings.

    Interesting discussion. I am good with metals and corrosion, but bobstays are not my bailiwick. What I have read is that the loads on them are incredible.

    I have to agree with Bruce. I like the...
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    Poll: Re: Designing a new CONCRETE BOAT

    It will float in calm water with a 200 kg load and 2cm of freeboard. As long as the load is very careful not to rock the boat and there is no wind and no waves, it may stay afloat. I have two canoes,...
  20. Thread: Pool noodles

    by MN Dave
    Replies
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    1,359

    Re: Pool noodles

    Solid core are still available. 3 for $15. Since you don't intend to swamp for extended periods, I would buy the less expensive hollow core noodles, cut one up and use it to plug the holes in the...
  21. Thread: Osage & Epoxy

    by MN Dave
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    Re: Osage & Epoxy

    As Thorne and Paul said, there are a lot of epoxies and not all epoxies are the same. I would add System 3 G-2 to the list of epoxies for difficult to bond woods. ...
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    Re: Epoxy Help please

    My initial thought was to recommend a polyurethane varnish as an alternative. Having looked at the tech data sheet and the skinning instructions, it sounds like the material might be good for your...
  23. Re: Newbie Question: Foam Core Hull - Direction of Foam?

    OK, simple question about general foam properties with no other useful detail as to thickness, actual materials etc. you might do better searching the Boat Design Forum e.g....
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    Re: 2 piece oars ...joining hardware ?

    http://www.duckworksbbs.com/hardware/misc/saw-frh/oar.htm
    http://www.duckworksbbs.com/faq.htm#ship

    The load on the ferrules should be lower if they are located closer to the blade than the...
  25. Re: Oarlocks / Rowlocks - Bronze vs Stainless? Bushings?

    I have broken one that looked just like the ones pictured in post 14 by Thorne. They were cheap cast brass. When I looked at the broken surface there was a large shrinkage cavity in the base where...
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    Re: Burning Bulk Bomb

    Google: 7 mins ago - All five holds of Bibby Line's troubled bulk carrier MV Cheshire have cooled down ... ...
  27. Re: Wood - Plywood - Epoxy bond, re-building my ketch Tonga

    Planes, Planes and more planes.

    Sharpening blades is a hobby unto itself. My expertise is a bit lacking, but there are many threads here about the subject. One old one that I had bookmarked...
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    Re: To name or not to name? That's the question

    https://youtu.be/LemG0cvc4oU
  29. Re: Wood - Plywood - Epoxy bond, re-building my ketch Tonga

    A new plane might just need tuning.
    I bought one years ago and thought that it was a useless piece of junk as it barely worked. Then I found out that planes need some tweaking. Once I knew what was...
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    Re: Sunscreen Ingredient Can Kill Coral!

    Chip,

    Thanks for the information.

    For a more detailed account of the study, read this: https://link.springer.com/article/10.1007%2Fs00244-015-0227-7
    The link may need a cookie. If it doesn't...
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    Re: Anchor Reality Check

    Have you considered a Rocna or their Vulcan design? They seem to be highly regarded and after viewing a number of comparison tests and videos on another thread, they do appear to be the best. EDIT: ...
  32. Re: Polyurethane floor finish: Water base vs Oil base

    Single component polyurethanes are all moisture cure. Someone will now work furiously to prove me wrong.
  33. Re: Polyurethane floor finish: Water base vs Oil base

    Mostly you will notice the color difference, and on oak, I would prefer not to use the very clear water base finish. Unless this stuff works as advertised, I would go with the oil base on oak. Since...
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    Re: Strip-built canoe from Fijian Mahogany

    Congratulations on an excellent job.
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    Re: Can my grandfathers boat be resurrected?

    Welds have oxide scale that has to be completely removed. Surface preparation <click> Surface preparation <click> Surface preparation <click> ...:rolleyes:

    Such a negative comment from such a...
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    Re: Running wires up the outside of my mast?

    Have you considered calling Roto Rooter? Or a conduit mandrel? http://www.conduittechinc.com/flex-steel-mandrels-c-7.html

    Maybe a borescope?...
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    Re: Fun with oarlock sockets

    A more mundane use for oarlocks mounted on the outside of the gunnel as on an Adirondack guideboat is to use them to bolt the boat to a roof rack. You can use them as drill guides to drill through...
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    Re: Can my grandfathers boat be resurrected?

    The metal looks to be largely intact, with some rust holes near the stem. If the sheet metal is mostly sound, you may be able to fiberglass the areas that are rusted through. I would not try to chip...
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    Re: Picture posting woes

    Firefox also has the [right click on image] 'View Image Info' option. That opens a window with the image url and some image size information. It also has a list of every image on the page, which can...
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    Re: Can my grandfathers boat be resurrected?

    There are several videos about restoration of a Mullins boat. There might be some helpful information in the videos and Snake Mountain Boatworks may be helpful if you call them. ...
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    Re: Can my grandfathers boat be resurrected?

    Oddly enough, it almost looks like it is made of steel sheet metal with a wooden stem. That seems highly unlikely, but steel lapstreak has been done. If it is steel, a magnet will tell you. There is...
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    Re: shellac question

    It would dry a lot faster if you spread it out as thin as practical. A plastic sheet on a cookie sheet might do the trick. I wouldn't dry alcohol in an oven, especially not a gas fired oven:eek:....
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    Re: Stainless steel chain ?

    The type of corrosion to worry about on an anchor chain is pitting. The pitting is much more of a problem with stagnant water than moving water. If it was pitting, you would see signs of rust.

    A...
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    Re: New Member! Obtaining lumber for build?

    Excellent. On that list there is a link to woodfinder:
    It returned this, http://woodfinder.com/listings/mark-frieden-hardwoods in Pomona KS, not far from KC, while looking for...
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    Re: Quick question on Bolger Teal

    And the thickness of the plywood sides.
    http://www.mcssl.com/content/assets/33/330110/Teal-2.jpg
    Payson and Bolger did their homework, built the boats and redrew the plans as built when it made a...
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    Re: New Member! Obtaining lumber for build?

    To add to this suggestion, look through the 2x6 through 2x12 at Menards. You might have to pick through at a few stores to find a recently opened pallet and avoid the reject piles. You can usually...
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    Re: uss susquehanna

    Where on the deck? My answer will be no in any case, but more information might help someone else answer the question.
    You might try a model ship forum....
  48. Re: Clean bilge with? Vinegar? BLO? DA? Medical marijuana??

    OK, a straight answer this time.

    Vinegar is not all that it is cracked up to be. https://www.keeperofthehome.org/vinegar-myth-vinegar-great-natural-cleaner

    Linseed oil soap isn't good in hard,...
  49. Re: Clean bilge with? Vinegar? BLO? DA? Medical marijuana??

    Bummer man. You have to understand that with an emulsional issue that there will be a lot of conflicted opinions. The grass roots of the problem are in the weed. If you have stone ballast, it is hard...
  50. Thread: When to Epoxy

    by MN Dave
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    Re: When to Epoxy

    This is an old comparison test of Raka, MAS, West, East and System 3. There is a good explanation of blush.
    http://www.oneoceankayaks.com/Epoxresl.htm



    Links to some suppliers:...
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