To accomplish security and Command, most fixed-wing forms have an empennage comprising a fin and rudder which act horizontally as well as a tailplane and elevator which act vertically.??????? ???? ?? ?????????. ??? ???? ?? ??? ???? ???? ??? ??? ?? ????? ??????? ?? ??????? ???? ????? ???????. ??? ?? ????? ?? ??? ????? ??? ??????? ? ?????? ????? ?? ?