Isn't there also a problem with opening parachutes at higher alt. , something to do with permability of the fabric and air molecules? Of course I might be talking hoop, think I read about it on one of those excellent ejection seat sites.
Homework for the pupils;
Bloggs regularly works at 30,000ft. His aircraft does not have any parachutes, how long has he got to blame everyone else for his impending doom if he fell out
? (assuming ground level is 0ft) In fact when will he pass out
and when will he bounce
?