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modern equivalent to doped canvas?

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lurker

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Apr 13, 2010
Messages
389
Location
salisbury, NC
apologies if this has been covered(!) elsewhere. not a UL, though maybe one day. i've built a stick kayak frame and am almost ready to cover it,LUGO2265.JPG mid-1960s plans say doped canvas. has technology advanced since then?
 

WBNH

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Oct 5, 2006
Messages
314
Location
Portsmouth, NH
I have a "kit" for a geodetic aerolite boat that is a similar skin on frame design (by Platt Monfort). His designs use a kevlar roving (cord) spaced every few inches at a 45 to the stringers and ribs, and then they're covered with aviation heat-shrink dacron and varnish. Plenty of vids online showing builds. Could maybe be adapted to your project.
 

karmarepair

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HBA Supporter
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Jan 13, 2011
Messages
229
Location
United States
I built an Aerolite single paddle canoe from Platt Monfort's plans nearly 30 years ago, and used the lightest un-certified Dacron from Aircraft Spruce to cover it, glued on with Stitts products, and heat shrunk it per the PolyFiber instructions. I filled the weave with marine spar varnish. In the water, it was transparent enough to see the bottom whizz by.
 

b7gwap

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Joined
Sep 1, 2014
Messages
283
Location
UT
I have a kayak like that I built in the 1990s. Plain canvas sealed with latex house paint. Still floats.
 

bifft

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Apr 17, 2011
Messages
283
Location
Utah
The most popular these days is nylon skin with a polyurethane coating for water proofing. Pretty much the same thing they make inflatable boats out of. Others use a beeswax/linseed oil blend to waterproof.

Used a precoated pvc fabric on mine, similar to oratex. Pretty much following these instructions: Wood Frame Kayak Builders Manual - Wood Frame SOF Kayaks by Thomas Yost

Much heavier than aircraft coverings, but we don't often run our airplanes into rocks.
 

lurker

Well-Known Member
Joined
Apr 13, 2010
Messages
389
Location
salisbury, NC
Nice work. How much does the complete frame weigh?
13&1/2 lb as shown. the rib frames are much heavier than they need to be. if there's a next time, the design will be refined some. polyurethaned most of the wood frame today. it's slow going, shop too small, can't work on it in foul weather.
 
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