leave it to the andrews to take up the difficult projects, right? (I’m an andrew as well).
The planned (ordered it today) fabric is: http://www.rockywoods.com/Heat-Sealable-70-Denier-Nylon-Taffeta
which a poorly (testing worst case) made seam (two pieces with a strip on the opposite side to get the sealable to sealable mate) held up to almost 10psi of air (didn’t test higher, our testing setup failed before it did). at about 6 oz a sq yard, should come up just shy of 36 oz of fabric… doesn’t look like I’m hitting my sub 3 lbs. Also held up to the very scientific “punch it with a screwdriver under pressure test” and “rub it on the sidewalk a bunch test”.
for the valve, I’m looking into this one: http://www.nrsweb.com/shop/product.asp?pfid=1493&sku=1493
seems it should serve my purposes okayish, if not I can try something else.
I do understand that anything I make will most likely be sub alpacka quality, that’s what happens when I pick up an idea with no background… gotta try though, even if I know it’ll end in failure.
Alpackas (from what i’ve read) rock, I get this… I don’t expect to even come close to quality and materials, it’s just fun picking up a pre-summer project every now and again (reminding myself about that RC plane, fly tying stuff, ammo reloading stuff, box of legos, etc… hiding away in some closet).
I’m also not trying to copy the Alpacka idea/design, I came here looking for general raft ideas and suggestions. If anything I’m copying the idea/intent behind the curtis raft, when water is moving I do my best to keep out of it’s way.