David,

I would be very interested in having a look at some of your spi designs. Especially with your comments on the design and some pictures of the sail in use. There is just too little hard information around on what sails should look like.
I have some ideas on what I would like our next spi to look like, but actually discussion them with other homebuilders would be great!

Marcus, have you had the opportunity to use the "yellow feber" spi any more?