So you have a POWERUP 4.0 and you fly it around and fancy yourself a pilot. Cool, But ever wonder why paper planes actually fly? We do, a lot. It probably consumes about half of our thoughts here at the POWERUP. But never mind that, we broke down the 4 pillars of aerodynamics, to give a quick and dirty explanation for why things don't just crash after half a second. Paper planes (and all flying things for that matter) fly because of a balance between four external forces: weight, lift, drag and thrust.