The wing provides the lift that causes the aircraft to fly.   Many Black Hawk Models kits contain a preshaped with a built-in airfoil.   All that's required is to join the pieces of a multi-piece wing, true up the edges, and sand smooth.   A tip weight is added to the outboard wing tip to balance the weight of the flying lines and prevent the plane from banking into the circle causing a loss of control.   The hardwood bellcrank mount is placed on the inboard wing in the position noted in the instructions.   Finally, the line guide which holds the flying lines is also placed on the inboard wing.   Be certain the wing is installed square to the fuselage and level.