There are many factors to be considered in ejection, not only the minimum height and speed, but also the maximum speed and height. If it is a two-seat or even multi-seat aircraft (such as F/A- 18, Su -34, E/A-6, etc.). ), because the pilot accelerates fast enough from a relatively static state to get rid of the speed of the plane (will the plane flying at high speed hit the vertical tail, etc.). ) and the load that the pilot can bear (which is one of the reasons why the ejection height can't be too high), otherwise it will cause great damage to the pilot, even lifelong damage, so that the ejected person is useless even if he is alive.