In order to achieve trim, stability, and control, most fixed-wing types have an empennage comprising a fin and rudder that act horizontally, and a tailplane and elevator that act vertically. This is so common that it is known as the conventional layout. Sometimes two or more fins are spaced out along the tailplane.
in order to achieve trim stability and control most fixed-wing types have an empennage comprising a fin and rudder that act horizontally and a tailplane and elevator that act vertically this is so common that it is known as the conventional layout sometimes two or more fins are spaced out along the tailplane