ChristiaanJ
Of course there was camber before the Wright's, but I was trying to suggest symmetricals?? Canvas is an airfoil, and simply because its shape in flight is "cambered", so is its 'under panel', hence the symmetrical requirement for the question?? A solid plane doesn't warp or curve in flight, for purpose of discussion, so it is a flying symmetrical?? No? F-104? I have gazed down the hard points at the tip at the "S" curve. For purposes of discussion, even though it "curves" it is very close to "symmetrical" as it is so very thin in section. This opinion wants a little leeway. Do you still have that nifty pic of the wing??
bear