Introduction to Flight by John D. Anderson is a great book for learning about aerodynamic principles. It puts the concepts in plain english, worded clearly with enough engineering and mathematics to show the origins and uses of the forlmulas and concepts it presents. It is a textbook, so it's a bit expensive, but if you're going to buy one book about aerodynamics in your lifetime, make this the one. Click the LINK BELOW for Amazon.com's order and description page.

> Given that this all works, can anyone advise me about the actual curvature
> of the wing? I ve seen several aero model/shapes, but with speed, water
> density, and ?, being so different, is there a curvature that would work
> best for the paddle? Is stalling a factor, and what the heck is stalling,
> anyway?

> thanks in advance for your thoughts,

> Tom