Below is a Google Earth image from my latest outing with my GPS track overlaid. The wind was a good 15 knots or so and a bit gusty. I sailed from the top right of the image down wind and on to a reach then back up wind again with a bit of tacking. This is the Waitemata harbour in Auckland and the tide was coming in so I was going upwind against the tide. As I got closer to the bridge I was more going for speed than height, and having some fun :)
As you can see it is not bad, considering the pros and cons of the design I'm pretty happy with this performance..
Average speeds up wind were about 7 knots and top speed on this trip was 13.6 knots.
