Patent ID: 8201776

Claim:
An airfoil comprising: a first foam portion for forming a first surface of the airfoil; a second foam portion for forming a second surface of the airfoil, the second foam portion and the first foam portion together defining a leading edge, a trailing edge, a first end, and a second end of the airfoil; a front spar positioned between the first foam portion and the second foam portion, the front spar at least generally extending proximal to and along the leading edge of the airfoil; a rear spar positioned between the first foam portion and the second foam portion, the rear spar at least generally extending proximal to and along the trailing edge of the airfoil; and a center spar assembly positioned between the first foam portion and the second foam portion, the center spar assembly located between the front spar and the rear spar, the center spar assembly comprising: at least one supporting member extending from the first end of the airfoil toward the second end of the airfoil; a sleeve extending from the first end of the airfoil toward the second end of the airfoil, the sleeve configured to receive a joining member inserted through the first end of the airfoil, the length of the sleeve being less than the length of the at least one supporting member; and an anchor positioned adjacent to the first end of the airfoil, 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 of the airfoil.