As an introduction, go through the reference pages that Tonyge23 posted earlier. In an article published in Seahorse, Bantock briefly outlined the influence of hull and foil design in RC boat performances.http://www.onemetre.net/OtherTopics/...rseArticle.pdf

Then search through this: http://www.foils.org/linksout.htm and enjoy. What are you looking for are the foils for low Reynold numbers.

Thanks for all the very valuable posts here above.
Slotracer577, very comprehensive explanations. Remains that the rudders from commercial sources are made very thin, ??.

Cheers,

lesnicolas