"Carl Orton" wrote in message
...

Guess the real question is: At what altitude is a pressure suit required?


Without a pressure cabin, about 50,000 feet.



Was SpaceShip One pressurized?


Yes.



All we saw was Melville with an O2 mask.


Which won't do him any good at all if the cabin loses pressure at altitude.



You always see the U2 pilots with full pressure suits, but I guess that
could be because of the duration at altitude? Since Melville was only at
apogee for a few minutes, is this like us requiring O2 only if at altitude
for 30 mins?


No.