Nope, it isn't symmetrical. Both the stock 4*40 and the S8036 are semi-symmetrical. You have to modify the wing saddle slightly to accomodate the 8036, but there is a difference in the flight characteristics. It's not exactly a quantum leap in performance, but I did notice a difference - the plane flew smoother.

I suppose that another difference could be that when I designed this wing, I allowed for a sheeted LE and partially sheeted TE with capstrips, so that smoothed out the wing.

Still and all, I like the way that it flies better with the 8036 than with the stock airfoil (which was pretty good in itself).

Bob