I heard that one advantage of eliminating some bottom wing ribs (in a new design, 600lb aircraft using a "flat" bottom airfoil) is that the fabric will swell inward, or billow into an airfoil with more undercamber and the benefit is more lift (same drag) at high AOA, like for takeoff & landing. I was thinking about this, and I think it will billow no matter what speed? So at cruise (about 70 maybe) you pay for the extra drag from the billowing on the lower wing fabric? What do you think about that?
Jan
Jan