thanks for the replies.

This is a replacment sail for an exsisting boat
(www.ncf.ca/~ag384/DogSkiff.htm). I
thought I'd try tyvek because I have some on hand.

Really not interested in doing what everybody else does, ie dacron. The
exsisting sail is nylon double thick with one layer aligned on the bias to
eliminate stretch. Worked great. Sail is 5 years old. The tyvek is not as
light as the nylon but moreso than polytarp. The air permiability could be
a problem. Hadn't considered that. I have actually seen Tyvek exposed on
unfinished buildings for over year. Good advertising I suppose. Print
doesn't degrade. Almost all my effort is in the longer mast to try a
larger sail on the boat, not in the tyvek sail itself. (First mast broke
during bend test. Starting on second.) For the sail plan I used the info
on sprit sails I gathered and put on my website (under Boats) for anyone
insterested in making a sprit sail.



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