http://www.willswing.com/blogs/PilotBlogs/tabid/38/EntryId/339/Canoa-10.aspx 

The morphed keel pocket/haulback fairing.

First day was a race, wind was on, pilots were keen. I am usually good at the
start gate but spent too much time practicing a critical move on the new course
so I was out of position for the first clock. Diving down to the compression
behind Daniel and crew, I knew it would be too much work to catch up and I
wanted to crush them the first day to have some breathing room for unexpected
conditions the following days. I returned to launch for the next clock slightly
humbled and ready to nail it. We were both in front of our respective groups so
had identical zero-wake conditions and i got him by a little over three minutes
on the approximately 40 minute course. Party time.