1.II. Operational principles of airplane flying attitude: mainly reflected in the ailerons ,elevons and rudder operation system.
二、飞机飞行姿态的操作原理——主要反映在副、升降、方向舵操作系统里。
2.In May of 1953, the balsa wood strips were again removed, and the X-4's dynamic stability was studied in the original flap/speed brake and elevon configuration.
1953年5月，加装的轻木条再次被除，人们开始研究X-4“副/刹车片和升降舵辅助”局的稳定性。
3.1953年5月，加装的轻木条再次被除，人们开始研究X-4“副/刹车片和升降舵辅助”局的稳定性。
In May of 1953, the balsa wood strips were again removed, and the X-4's dynamic stability was studied in the original flap/speed brake and elevon configuration.
、升降
除，人们开始研究X-4“副
局的稳定性。
除，人们开始研究X-4“副
/刹车片和升降舵辅助
局的稳定性。
