I am currently laying out a foam profile version of the GeeBee R2 for flying at my local park. My question is what is the best spar material for a 36 inch wing span and what is the best way to install it? I have seen everything from laying the spar on the foam and gluing it down to cutting completely through the foam and gluing the spar between the two halves. My guess is it really doesn't make much difference aerodynamically but from a strength and aesthetic point of view it does. Any opinions will be greatly appreciated. By the way I am using 6mil depron for the building material.