> you could just have flat boards at an angle You can certainly have symmetrical (vis-a-vis the horizontal plane) wings. ETA: here some more info: https://avi

> you could just have flat boards at an angle You can certainly have symmetrical (vis-a-vis the horizontal plane) wings. ETA: here some more info: https://aviation.stackexchange.com/questions/39146/how-do-symmetrical-airfoils-generate-lift https://aviation.stackexchange.com/questions/39146/how-do-sy... https://aviation.stackexchange.com/questions/14283/how-do-paper-airplanes-create-lift-if-their-wings-are-flat https://aviation.stackexchange.com/questions/14283/how-do-pa...