At transonic speeds (close to the velocity of seem), it can help to comb the wing backwards or forwards to lower drag from supersonic shock waves as they begin to sort. The swept wing is just a straight wing swept backwards or forwards. هذه المقالة عن القطار، وهو وسيلة نقل. https://gregory5wy07.bloggerchest.com/26919264/the-greatest-guide-to-خانه