The current airfoil looks to be a modification of an Eppler Airfoil (E205-ish), simple flat bottom. With this type of airfoil it's very easy to build a wing fairly accurate. However, using the Eppler 231 (as shown) would require a different building technique or skill set to jig the wing. My thoughts were if built incorrectly there would be zero benifit. Snice my last post, I've had a chance to read through the Allegro-Lite 2m website completely; I like the current design and EZ of build.
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Schpankme