Slenderly beautiful--but what strength there was here! There was a compactness to this winged creation that only an exact knowledge of certain sciences could give. In the peculiar curved shape of the wing surface lay the solution to one of the deepest hidden secrets of flight. The old flat shape of airplane wings had depended entirely upon air pressure from below for the rise. The peculiar curve to the Wind Bird's silvered wing would take full advantage of a thrice greater power--the air's suction pull from above. The material in the wing was in itself a marvel, laminated strata, light in the extreme, yet almost as tough as iron.