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Epoxy/Fiberglass Strength

Kayak Jack

Well-Known Member
Aug 26, 2003
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Okemos / East Lansing Michigan
Thanks, JD. I assume that 2 layers mean one layer on each side. I've never over stressed any bottom of any boat. They've been misused from time to time. Quality wood, covered with fiberglass, is tough, flexible stuff.
 

beekeeper

Well-Known Member
Mar 4, 2009
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Thanks, JD. I assume that 2 layers mean one layer on each side. I've never over stressed any bottom of any boat. .........................
In the text he states "between two layers of 6 oz." so I assume one layer of glass on each side. Hurts my head to dwell on that much data, but I see some things that may need more testing to verify. 3/16" cedar covered with 2 layers of cloth vs. 5/16" covered with 2 layers of cloth?
 

beekeeper

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Mar 4, 2009
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5/16" is about 25% heavier than 3/16". His test showed both equal pounds to failure with 2 layers of 6oz. cloth. Does not compute for me. There is a lot of data presented and probably overall accurate.
A "real" pirogue maker once told me anything you add to the build will add strength. It will also add weight.
Finding the right balance is what makes for a good boat.
 

Kayak Jack

Well-Known Member
Aug 26, 2003
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Okemos / East Lansing Michigan
Ummm, I question the 25% figure. 5/16 is 5/3 times thicker than 3/16. That's 166% thicker. That's 66% more material. I haven't weighed two, comparable pieces, but would expect the thicker chunk to weigh 66% more correspondingly.

Anyway, the second coating of fiberglass, on the other side, certainly adds strength and longevity to the already strong plywood. One day, it would be very interesting to actually watch plywood being made. One heck of a good invention!
 

beekeeper

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Mar 4, 2009
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I told you it was too much data for me to think about. The 25% increase in weight was in reference to 1/4" strips vs. 5/16". My mistake. The comparison for strength was from the chart. 3/16" with glass equals 5/16" with glass? Just saying doesn't seem likely to me. If so how? Why?
 

Kayak Jack

Well-Known Member
Aug 26, 2003
13,113
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Okemos / East Lansing Michigan
Physically testing the various panels to the point of destruction is time and lumber consuming. Causes tired eyes and sore neck muscled too.

Take one shot glass of singlemalt scotch, lean back in an easy chair, take a sip. Repeat.