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 Post subject: 17' Touring Canoe--Materials List?
PostPosted: Mon Feb 07, 2005 5:58 am 
Okay, I've printed the .pdf files on the site, I took them to work and blew each sheet up to a 11x17" paper size, and made a cardboard mockup. I like the design very much and plan on building it soon. My problem is this: most of the other designs on here state resin and fiber requirments, but this one does not. I can see it will need 4 sheets plywood, (will get five incase I screw up!), but I don't have anywhere near the expirence to look at a plan and know how much it will need for other materials. Is there a formula to use? or is it just practice? The page lists estimated materials cost at... hmm.. less than 200 anyway. What is this based on?


Sorry to be asking so many questions, but this is my first boat, and I want to do it right, while at the same time, money isn't easy to come by.


Thanks in advance!

dave


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 Post subject:
PostPosted: Mon Feb 07, 2005 5:59 am 
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Joined: Sun Feb 06, 2005 3:39 pm
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Hmm.. thought I was logged in. Guess not... :)

dave


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 Post subject:
PostPosted: Mon Feb 07, 2005 9:45 am 
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Location: Greensboro, NC
Morten will be better able to tell you for sure, but I estimate 1.5 gallons of resin, 1 quart of woodflour, and about 30 yards of tape (which generally comes in 50 yard rolls).

That 1.5 gallons of resin is with some waste factor but it's right on the border line. If this is your first boat, consider getting the next highest increment. Example: Most places, like http://www.raka.com, sell epoxy in 1.5 gallon increments. So if you think you'll need extra, buy 3.0 gallons. Cheaper than trying to get 2 gallons.

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 Post subject:
PostPosted: Tue Feb 08, 2005 3:34 am 
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If you don't mind me asking, how did you figure that? I can pretty much guess the tape by measuring the seams, but what about the resin? Is it just an expirence thing? or is there a "one gallon covers xx sq yards" type of thing?


Lastly, how do the resin requirements change if I was to fiber cloth the entire outside of the craft?

Thanks in advance:

dave


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 Post subject:
PostPosted: Tue Feb 08, 2005 9:14 am 
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If you go to the System Three web site and download their free epoxy book, there's some formulas you can use to calculate resin usage.

From doing this on many designs, I found their formulas to be a little lean, especially in the filleting material calculation. So I've gotten pretty good at building in the right fudge factor.

Let me try to get a hold of Morten. He gets busy this time of year.

I estimate that you'll need an additional .85 gallon if you're glassing the entire outside of the boat with 6-ounce cloth.

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 Post subject:
PostPosted: Wed Feb 09, 2005 12:38 am 
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Joined: Tue Dec 21, 2004 7:55 am
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Location: Denmark
Been through my files and it seems that Matt's estimate is pretty close. Maybe some more tape but one roll with 50 yd should be enough.

Quote:
Lastly, how do the resin requirements change if I was to fiber cloth the entire outside of the craft?

Estimating the resin needed for a boat is a calculation that is very unreliable, thus two builders are never alike. Some uses more resin and some less. What I normally do is that I calculate the fabric or tape needed for the boat. Then after knowing the specific weight of the tape or fabric I take 2.5 times the amount for resin. It is my experience that it will work for most builders.

An example (sorry it comes in metric):
The touring canoe has an area of 6.35 sqm (square meters) if it is covered entirely outside with a crowfoot 160 g/sqm fabric it means that you will have to use 6.35x160=1016 g of glass fabric. Now the resin needed will be 1016x2.5=2540g or 2.54 kg. Now most suppliers deliver their resin by volume so the only thing needed is converting the weight amount to a volume. Most resin has a density of 1.1 kg/litre, therefore the volume needed will be 2.54/1.1=2.3 litres (0.6 gallon). So this will be the approximated amount for covering one side with fabric. Remember that if you want to cover both inside and outside the amount needed will be double.

Hope it helps you out.

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Morten Olesen - Boatplans.dk
Website: http://www.boatplans.dk/
Blog: http://BoatBuildingArticles.com/

Check out my author page at Amazon and browse for boat building books: http://www.boatplans.dk/news.asp?news=amazon


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 Post subject:
PostPosted: Wed Feb 09, 2005 4:38 am 
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That helps alot. This is my first boat, and While I don't want to get alot more than I need, I don't want to run out in the middle either.

I will probably go with 3 gallons, and run fiber cloth over the outside. Would I still need to tape the inside after the fillets?

Thanks for your help.

dave


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 Post subject:
PostPosted: Wed Feb 09, 2005 10:11 am 
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Yes, the tape at the inside is still needed after the fillets.

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Morten Olesen - Boatplans.dk
Website: http://www.boatplans.dk/
Blog: http://BoatBuildingArticles.com/

Check out my author page at Amazon and browse for boat building books: http://www.boatplans.dk/news.asp?news=amazon


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 Post subject:
PostPosted: Sun Feb 13, 2005 2:25 pm 
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Okay. Thanks!

dave


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