舰载机的自由飞行钩住情况

自由飞行钩住（FFE）是指飞机在处于上仰姿态，且所有起落架尚未接触甲板的情况下的拦阻钩钩索。此时，飞机有较大的姿态角和较低的下沉速度。根据起落架和拦阻钩几何布局、飞机重心位置，拦阻力线可能处于飞机重心之下，因此产生显著的低头力矩，造成前起落架首先接触甲板，而主起落架稍后继之，飞机的低头俯仰速率可以导致前起落架以较高的下...

Free Flight Engagement Condition of Carrier-based Aircraft

The mechanism of a free flight engagement （ FFE ） condition are as follows： the aircraft＇s arresting hook catches a deck cable in a nose-up orientation with all gears above the deck surface. The aircraft has attained a high pitch attitude and low sink speed at pendant engagement prior to touchdown. Depending upon the landing gear and arresting hook geometry and the aircraft CG position, the resultant arresting force can be below CG and result in a significant contribution to nose down pitching moment. That causes the nose landing gear to first make contact with the deck, followed shortly after by main landing gear contact. The nose-down pitch rate can result in a high nose landing gear sink speed at touchdown. So an FFE at the low sink speed can result in obtaining nose landing gear loads equivalent to those obtained at the high sink speed condition of a normal arrested landing. Based on the consideration and analysis of all possible landing conditions, it＇s determined that the most critical carder landing condition is that of an FFE for strengths of nose landing gear and its supporting structure of a heavyweight carrier-based aircraft.