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Thread: Simple Proa

  1. #141
    Join Date
    Mar 2010
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    central cal
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    Default Re: Simple Proa

    Me? I don’t know. Best guesses are what I got.

    That’s why I posed the question. I want experienced feedback, if there is any. Guesses, conjecture ps and thoughts are invaluable, too, because I have no idea. I’m working with 100% “book” learning.

    The reason for some of these exploratory lines, though, is the nature of the build. This is not pick what’s best and do it proper-like; this is catch as catch can, Rocketships From Dirt type building, and I have no IDEA what wood may present itself for cross beams and platform, yet.

    I’d like to explore all the options with the smart kids before I just go ahead and start doing stuff.

    Truth be told, that damned home made trimaran thread had me thinking about folding beams.

  2. #142
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    Mar 2010
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    central cal
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    Default Re: Simple Proa

    Nothing has happened on the boat. Much actual work to do, and much heat have precluded boat work.

    Much heat.

    The next steps involve epoxy work, so I have to wait for this heat wave to pass.

    Meanwhile, I just look at the model, and the hull, and look some more. I keep thinking about the crossbeams and platform, too, and how best to build that assemblage as lightly and strongly as possible with the available resources.

    I think this boat is being born in the spirit of the originals in that way, at least; I am making the best of what I have to make the nicest boat I can with it. I hope, anyway.

    I continue to ponder three crossbeams (or maybe four even!), if only because the platform needs to be strong enough to support all the weight of the sailor(s), and the wider the span between beams, the heavier the platform slats need to be. And, that is the same thinking with the ama connection; an extra lashing is not that big a deal in relation to the benefits of having a better supported platform, for the same weight.

    And, yes, I know what it’s like to lash stuff together every time you use it. It’s all guesses and compromises.

    The real answer will reveal itself when I can do a few full size tests with mock-ups. Soon enough, I hope. We are due to get some habitable overnight lows soon.

  3. #143
    Join Date
    Feb 2007
    Location
    Port Stephens
    Posts
    24,647

    Default Re: Simple Proa

    Rick

    Lean and nosey like a ferret

  4. #144
    Join Date
    Mar 2010
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    central cal
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    Default Re: Simple Proa

    Yesterday, while shuffling the hull around my current paying job, I just kept noting some unfairness in the windward side of the hull; just some area where the bottom and side curves made a weird, harsh wonk.

    The spreader stick slipped and as the beam shrank, the wonk went away...

    So, the new beam at sheer is about 10cm less? I havenít measured. The side panels look much more smooth in their transitions to and from pointy, and the whole looks much more cohesive.

    Also, the weather may have broken, and if it stays this low overnights, I can start to tab this hull together!

  5. #145
    Join Date
    Jun 2003
    Location
    Fredericton, New Brunswick
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    46,021

    Default Re: Simple Proa

    Very fine.
    If I use the word "God," I sure don't mean an old man in the sky who just loves the occasional goat sacrifice. - Anne Lamott

  6. #146
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    Mar 2010
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    central cal
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    Default Re: Simple Proa

    DFC2A772-7FE5-4218-846F-CEFE675705DF.jpg
    This is the end... I’m not sure which. This shows the asymmetry and the tilt to the bottom panel well, I think.

    5C41E143-1330-4C14-9A59-593AD99613DE.jpg
    Yeah, I know, but the other end looks exactly the same. This is the side I had to remove the “wonk” from. There was a weird knuckle towards the end. Looks smoother to me.

    78AA25E4-5094-469D-9A61-8FEFDA0069C2.jpg
    I’m going to use stems so I can screw the panel into something, as well as glue them. I think this will help keep the stem seam on the centerline, and it will give some meat to screw an outer rub strip into.

    This is an absolute jackelope of a monstrosity, already.

  7. #147
    Join Date
    Feb 2016
    Location
    Tryavna Bulgaria
    Posts
    165

    Default Re: Simple Proa

    Now I get it, that's a hard shape to achieve.... I almost can't believe the 2 photos are the same hull.... Very cool bow and rocker.
    That flat bottom will take a load!!! Looking good.
    Finally back 2 it. Good Luck!

    Keep Shunting bro.......

  8. #148
    Join Date
    Mar 2010
    Location
    central cal
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    Default Re: Simple Proa

    Thanks, Yo! I tried very hard to combine a LOT of different desires into a very simply made hull. I hop it all works as planned. Hahaha.

    I am finally able to contemplate using epoxy, again, so Iím messing around. The next few steps will be tabbing and gluing up the hull, so the heat was a HUGE factor in the delay.

    Well, that, and actual work to earn money. Haha.

    Baby steps toward a fall launch, I hope.

  9. #149
    Join Date
    Jun 2007
    Posts
    839

    Default Re: Simple Proa

    Looking like some excellent TLAR engineering!

  10. #150
    Join Date
    Jan 2018
    Location
    Mosier Oregon
    Posts
    51

    Default Re: Simple Proa

    Nice Work!

    Looks strong and fast.

    -Derek

  11. #151
    Join Date
    Mar 2010
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    central cal
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    Default Re: Simple Proa

    Thanks all.

    Unfortunately, I think there has been a MAJOR problem occur with one of the hull panels. Not one of the main hull panels, but...

    I donít know, and, frankly, I donít really WANT to know, at this point.

    It may be bad. Like, start over bad... but, at least I wonít have to start form total scratch, if I do.

    Now, off to ignore it for a few days, and come back with fresh eyes!

  12. #152
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    Mar 2010
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    central cal
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    Default Re: Simple Proa

    I couldnít ignore it.

    There was a major failure in one panel. The inner ply simply broke apart, and the break spread outward. The panel is totally compromised, and would have failed completely except for the outer plies. I mean, the good news is, the stuff endured a failure fairly well. I guess thatís good?

    It could have been a random weak spot or undetected (by me) void, or just a flaw in the wood... or, all the inner plies of this stuff are just pure garbage.

    The literature says itís gravy, but this panel makes me too doubtful. I may never know if the damned thing sails, now.

    Insert seven minute long uninterrupted string of filthy swears here.

  13. #153
    Join Date
    Jun 2003
    Location
    Fredericton, New Brunswick
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    46,021

    Default Re: Simple Proa

    Bugger. Bugger.
    If I use the word "God," I sure don't mean an old man in the sky who just loves the occasional goat sacrifice. - Anne Lamott

  14. #154
    Join Date
    Mar 2010
    Location
    central cal
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    Default Re: Simple Proa

    Well... the good news is I have some righteous templates.

    I had doubts, and the ply wasnít exactly what I ordered, but I went ahead, and I shouldnít have.

    Meh.

    Dumb. Not my first time being dumb, either.

    Life keeps lifing.

  15. #155
    Join Date
    Oct 2009
    Location
    Juneau, Alaska
    Posts
    5,072

    Default Re: Simple Proa

    Cool project Rob! Thanks for sharing it.
    -Jim

    Sucker for a pretty face.
    1934 27' Blanchard Cuiser ~ Amazon, Ex. Emalu
    19'6" Caledonia Yawl ~ Sparrow

    Getting into trouble one board at a time.

  16. #156
    Join Date
    Sep 2020
    Location
    Michigan
    Posts
    8

    Default Re: Simple Proa

    Could you post a picture? I would like to learn what not to do from the failure.

  17. #157
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    Mar 2010
    Location
    central cal
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    Default Re: Simple Proa

    There isnít much to photograph. There is a crack inside the plywood which allows it to bend along the internal failure.

    A simple material failure.

    The way to avoid it is to use good materials.

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