Organic sails??

Well my husband and I were discussing sails(surprise)and how they are petroleum products and we were stuck with it. Or are we?

There is organic duck available. It is expensive and it isn't as heavy as I would like, but we are going to build a suit for our 30' gaffer. Just a main and a stays'l.

I know there is hemp line available. We plan to "tanbark" these sails in hopes to have them last longer. How long will they last? How well will they sail? How expensive will they be?

Stay tuned, I will post pictures as this project evolves. This project will be secondary to my regular sailloft work so it may be a long process!