Thanks for the information. I'll choose a conventional airfoil such as
a 4418 and maybe go with a biplane configuration. I wanted to keep the
design fairly simple so I didn't plan on using flaps. The Junker style
flaps seem great for good lift but they also increase the required
angle of attack (the problem with slats as well).

I have some information on a glider pulled behind a boat called the
"Aqua Glider", although I planned on using foam core fibreglass
construction. I want to build a fairly solid structure as I may want
to put and engine on it in the future.

Brock