An airfoil comprising: a foam housing having a leading edge, a trailing edge, a first end, and a second end; a front spar at least generally extending proximal to and along the leading edge; a rear spar at least generally extending proximal to and along the trailing edge; and a center spar assembly located between the front spar and the rear spar, the center spar assembly including: at least one supporting member extending from the first end toward the second end; a sleeve extending from the first end toward the second end, the sleeve configured to receive a joining member; and an anchor positioned adjacent to the first end, the anchor configured for securing an end of the sleeve and an end of each one of the at least one supporting member at the first end.
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