Subject: Re: [baidarka] Shrinking Nylon
From: Hendrik Maroske (HMaroske@freenet.de)
Date: Thu Jul 18 2002 - 17:27:49 EDT
MICHAEL SILVIUS wrote:
> Nylon
> I believe responds to water by shrinking. Polyester uses heat. though I
> undertand the shrinking in both is minimal???
My experience is _my_ nylon _expands_ when wet,
will shrink a little when heated but afterwards
returns to an even lore loose state.
And the Superflite shrinks like hell when hot.
My understanding is that it is not just the
difference "Nylon" versus "Polyester", but it
largely depends upon the fabrication of the
specific fiber. "Nylon" or "Polyester" seem
to be very wide ranging terms, far from
specifying the material properties, more like
the difference between "Gasoline" and "Diesel".
More exactly, the amount of shrinkage is built
into the fiber by the factory, and not described
by the classification "Nylon"/"Polyester". So
you will have to get the material specs for
the cloth you want to use, to be sure.
As for aircraft dope, I just have read yesterday
that the dope in fact contributes to the skin
strength much more than I thought, only where
there is a crack in the dope, the fabric will
have to carry substantial load. You will not
want to have that much tension on a kayak skin.
just my 0.02
Hendrik
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