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  #31  
Old 07-06-2005
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Marine Grade Plywood?

windship/Dennis

No worries. I ask for advice in an effort to increase my understanding of best practices. If I had the money to carry through on all that has been offered, I would. Since I cannot though, I will use all the advice given to do the best I can with what I have available.

I have picked up many valuable tips from the advice given... and though I cannot apply it all due to circumstances, I will apply what I can.

Believe it or not, the few threads I have run have been very useful to me. I have refined the size and type of boat I will build. I have refined many of the basic structural specs. I have even had a chance to refine my initial desires on what I intend to do with the boat.

It''s all been VERY useful and I am not disregarding the advice I''ve been given at all. I''ve been compiling it and will apply as much as I am able (within my financial restrictions).

You guys have the practical knowledge that I lack. That is why I ask.

I am unable to apply all the advice given and must make certain compromises. That is why I appear to ignore (but I really AM listening)

I don''t know if I can post pictures here... I will if I can or will make them generally available if I can''t. The first pics will be of the dinghy though... and I fear it will frighten many of you! ;-)

Thanks again for the advice, and I really AM listening.
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  #32  
Old 07-06-2005
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Marine Grade Plywood?

Hi Vastbinder,

I am not sure where you are finding a suitable grade of 1/4" exterior plywood for $10.00 per 4x8 sheet. Minimally you will need to look for a A-B grade Exterior grade plywood. A-B will contain some non-organic fillers and so will not seal as well as is desirable. I did a quick search around here and the cheapest 1/4" A-B exterior that I could find was over $30 per panel. The only 1/4" A-B ply that I could find under $30.00 per sheet was graded as exposure 1 plywood which is not the same as Exterior grade and which would be totally unsuitable. I could also find some one side sanded exterior grade A-C stuff down under $20 but AC will not stand up to the bending involved in planking a boat. Frankly, the glue line between the two courses of 1/4" plywood will cost way more than the difference in price between exterior and Marine grade ply. I would suggest that you use 1/2 marine grade below the waterline at least, and then do the topsides in 1/2 exterior. The savings in laminating the sheets of 1/4" plywood would pay the difference.

Jeff

BTW What do you wish to be called?
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  #33  
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Marine Grade Plywood?

Thank you for asking... Scott is my first name.

I have several months to survey my local area to make sure I get suitable plywood. If I can find marine plywood in my price range, of course that''d by my first choice. It''s when I see the $200 a sheet stuff, that''s something too rich for my blood.

The reason for the 1/4 inch is that I''ve found that curving 1/2 inch ply is very stressful on the wood and it tries really hard to snap back to it''s original shape... which to me is a structural weakness. When one laminates 2 1/4 inch sheets, they bend easily to the desired shape and after the glue dries, they are permanently bonded into that shape... they will not attempt to spring back to flat. Yes, using the glue is a bit more expensive and work intensive, but the end result is better. (of course, in this case, one would make sure to use an entirely waterproof glue).

Loved the little 18'' boat by Antonio Dios? Nifty thing which I imagine would make a wonderful all-purpose lake boat for multiple persons (family boat)
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  #34  
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Marine Grade Plywood?

Hi Scott,

Tony is an old friend of mine. We met probably 15 years ago at a small boat festival. He is really blessed with that rare combination of an artist''s eye and the ability to deal with the complex technology involved in designing and building boats. (Tony is that rare designer who has both designed and built boats with his own hands and so understands the impact of a design decision on the poor bloke that has to actually build what was drawn.)

Tony and I have enjoyed many a happy hour in lively discussion. Our ideas about yacht design come from very different directions. Sometimes our ideas are very close and at other times they represent the opposite ends of the spectrum. I was honored to be included in Tony''s book, ''Designer and Client'', as one of the clients. The chapter for better or worse reflects some of our differences in design philosophy. For many years Tony would send me his ''works in progress'' so that we could kick around ideas but we have not been doing that for some time now.

He has a number of stock plans that might suit your objects and certainly would be an excellent source to turn to for a quality design.

Regards,
Jeff

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Marine Grade Plywood?

Jeff,

Actually, at this point, I''m considering going with some advice I was given awhile back and purchasing the plans for a small boat something like the 18 footer currently on Tony''s webpage.

Having the actual layout and dimensions would likely be so much easier for me than having to do some educated guessing. The results would likely be sooo much better.

Though, if I recall correctly, there are some free wooden boat plans out there... some of which I took the time to copy.

By spring, I should have things all prepared and worked out! Now I just need to track down a trailer to get my sailfish to water and I''m all set ;-)

Scott
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Marine Grade Plywood?

Hi Scott,

Late lunch today......There are a variety of boat designs in the ''public domain''. Most of these are older designs from the 1940''s through 1960''s that were published in now defunct magazines. Some of these were reasonably good designs, but many were not very good designs even by the standard of their day and are very poor designs when viewed by today''s standards.

I think that you may be referring to Svensens free boat plans. http://www.svensons.com/boat/

I find most of the boats on that site not all that great a design. One design that does appeal to me is the 22 foot sharpie, ''Southwind'', although I suspect it would not be the most idiot proof boat to sail.

Here is another site with a bunch of older plans. I thought that ''Coot'' was a pretty neat little boat.
http://hometown.aol.com/polysail/HTML/oldboats.htm

In a similar veign, you might see if you can find a public domain set of drawings for Commodore Ralph Munroe''s ''Lifeboat Sharpie Egret''. This has always seemed to be a neat design. WoodenBoat magazine sells a nice set of proprietary drawinsg for the Egret.

In a more modern veign I thought that this was a very nice 26 footer for which very detailed free plans were available. http://www.boatdesign.net/nyd/K800/

BTW I happened onto the Boat Builder Central site: http://plywood.e-boat.net/categories.php

They have 1/4" marine grade Meranti for $27 per sheet. In other words that would add roughly $120 to the project over non-marine ext fir plywood. I really do not see how you can decide not to use marine ply when you consider the over cost and time involved in your project.

Regards,
Jeff
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Marine Grade Plywood?

Jeff,

Thanks for the leads on boat designs. I shall have to look through them as time permits and when I select one, I''ll likely ask for opinions on it.

If the boat I choose is small enough and the marine ply available at a price I can manage, I certainly intend to have the good sense to use it! ;-)

Thanks greatly for the help... and I''ll let you know when a design is selected so I can get some feedback on my choice.

Scott
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Marine Grade Plywood?

OK, yeah, it''s the svensons site that I''ve been to before.

I had copied out both the starlight and the moonlight plans. Neat site!
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Old 07-08-2005
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Marine Grade Plywood?

On the svensons page, would anyone care to express opinions on the Blue Moon, Gypsy, and Star-lite designs... with a thought to possibly using the Blue Moon as a starter boat since it''s smaller and I''m guessing easier to handle for a single person.

Scott
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Marine Grade Plywood?

I would say that all three of these designs are very dated and would take a lot of effort to build only to produce very mediocre boats. Of the pocket cruisers on the Svensen site, the one that looks most like a decent boat that would be reasonably easy to build is the 22 foot sharpie called the Southwind (labled ''south'' in their link). This is a pretty traditional sharpie design.

Jeff
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