FIELD: aviation.
SUBSTANCE: airfoil comprises fuel containment regions disposed in the airfoil, and a continuously curved spar extending from a root portion of the airfoil toward a tip portion of the airfoil. Continuously curved spar comprises a unitary configuration, a continuous curve along the continuously curved spar and, either having a portion forming a structural wall of the fuel containment regions, or, being internal to the fuel containment regions. Aircraft comprises an airfoil. Method includes steps of forming spars.
EFFECT: group of inventions is aimed at reducing weight.
17 cl, 13 dwg
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