I've heard that the modern seats should do 0/0 (zero airspeed and zero
altitude). The trick is getting enough altitude for the chute to
deploy correctly. That's how my dad died. He ejected from his A-7 on
the ground after the tail hook caught and then broke. His chute didn't
fully deploy before he hit the ground. The plane blew up after hitting
the rocks.


Thunderbird F-16 cockpit video of ejection at Mountain Home AFB crash.

http://www.razorsedgesoft.com/eject.mpg