Subject: What is the fastest point of sail for a windsurfer? Why?

Aloha-- I am a teacher at the Maui Ocean Academy (where students work 
on academics in the morning and hit the ocean in the afternoons to train 
for surfing and windsurfing).  I am interested in finding science 
websites which specifically relate to the physics of windsurfing and 
surfing.  
Know of any?  If not, can you explain how a windsurfer works...in terms of 
the lift like on airplane...wow, that would be great! BTW Spectacular 
site!!
 We have found a site on "newton's 
apple" regarding windsurfing; however, we do not use daggerboards on Maui 
since it is way too windy (so the answer isn't complete).  We are also 
trying to find the fastest point of sail.  If the wind is blowing from noon 
(like a clock)...the students are trying to argue that the fastest point of 
sail is at 9 and 3 o'clock.  Since I used to race, I know that the fastest 
point of sail is actually between 4 and 5, and 7 and 8 o'clock (also when 
you are sailing a big board with a daggerboard you retract the daggerboard 
on this reach--called a broad reach--why?).  So, who is right, and why?  
Mah

Re: What is the fastest point of sail for a windsurfer? Why?