A simple test for sail cloth is to hold some across your mouth and try blowing through it.
Good sail cloth will resist letting the air pass...even spinnakers.
Bad sail cloth, usually old or UV-damaged, will generally let most of the air pass through.
Laminates generally block all of the air, as the mylar film is almost completely gas impermeable—that's why mylar helium balloon last so much longer than the rubber ones. BTW, never seen a Laminate chute so far...but I could be wrong.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.