I would have to agree with Kent (all but the twin tip part for slalom). I'm pretty much convinced that twintips in the race scene are a lost dream (I'm talking course racing here, not speed).
Maybe the idea is not to loose too much on the upwind tacks and rip the raceboards on the downwind ones.
Also, for riders who don't have race in mind, the advantages are numerous:
- TT riders will have the possibility to ride in areas upwind of the crowd so far only accessible to foilboards or raceboards,
- no wind days : gaining 8-10 degrees upwind (wereas no other TT guy can ride) means more time on the water
Now I think about 2 things:
- a foldable Twin Tip with such a dagger board
- retrofitting an existing TT with the necessary reinforcements