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The chord line of any wing is a line drawn between the middle of the leading edge and the rear tip of the wing, not including any wicker bills or other additions. The angle of attack is the angle of the chord relative to the direction of the oncoming air, which is influenced by the body panels. If the air is redirected to follow the front hood for example, then the angle of attack would be the angle formed between the chord line of the front wing and the direction of flow of the air. For most designs of Sprint Car hoods, this flow direction is almost parallel to the ground.