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To attain stability and Command, most fixed-wing types have an empennage comprising a fin and rudder which act horizontally and a tailplane and elevator which act vertically.ویکی‌پدیا® علامتی تجاری متعلق به سازمان غیرانتفاعی بنیاد ویکی‌مدیا است.An inline engine is usually a reciprocatin