Bryan & Lorentz, it's a Kline-Fogleman KFm3 airfoil (top steps at 50% and 75% chord). The KF airfoils are predestined for foamies because they are easy to build and have decent aerodynamic characteristics.
There are different variations of the airfoil. The one I've chosen is for the UAV Flying Wing is for slow flying "heavy lifter" planes.
Great looking little UAV! Looks like a mini ScanEagle. I like how you have full access to avionics in the fuselage. Looks like you used a variation of the KF airfoil. I've been wanting to try this airfoil design myself with some Depron foam I have lying around
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There are different variations of the airfoil. The one I've chosen is for the UAV Flying Wing is for slow flying "heavy lifter" planes.