PTP: Compare the shape of your spi with this old blown out Tornado spi from Gran segel. This spi have had it's luff line tightened to bring it's draft forward a bit and the leech line is overtightened. In a picture of a new spi, there would be less draft, positioned further forward. Entry and exit would also be a bit flatter. These spis are the "class standard" in the Tornado class, and I dont think your boat is much slower than a Tornado. I have some other photos showing the setup of this spi I could send you by e-mail if you are interested. Just PM me your e-mail adress.
