In conventional aircraft, the horizontal stabilizer provides a downward force to counteract the nose-down pitching moment generated by the main wing. In a , there is no separate surface to perform this role. Therefore, the wing itself must be designed to be inherently stable.
In a conventional aircraft, the wing produces a nose-down pitching moment (due to its camber). The tail, located far aft, produces downward lift to counter this. In a tailless aircraft, there is no distant surface. Therefore, the wing itself must be inherently stable. This forces designers to use special airfoils——where the trailing edge curves slightly upward. This reflex reduces lift on the rear portion of the wing, creating a nose-up moment to balance the nose-down moment from the front. tailless aircraft in theory and practice pdf
Chapter 7: The Aetheric Rebound.
In a conventional aircraft, the horizontal tail acts as a counterweight to provide longitudinal stability. However, that tail also creates "parasitic drag" and adds extra weight to the airframe. In a conventional aircraft, the wing produces a