The Lancair IVPs have a  5 PSI cabin differential.  Airlines have 8 PSI differentials.  SpaceShipOne is way up there in altitude, nearly zero atmospheric.  Yet he wasn't wearing a pressure suit during the flight.  Inside an astronaut EVA suit, there's ~10.5 PSI (versus our 14.5 PSI on terra firma).

So, what is the cabin pressure differential inside SpaceShipOne?

And how does it get this...bleed air of the engines...doubtful?  And how does it control it, so you don't get the full magilla at 50,000' and overpressurize your brains during the initial stage?

And where's he get pressurization at 50,000' prior to release, before the engines fire, when he's hanging under the White Knight?

And what happens when the rocket quits...when you need the pressurization most?  Still climbing...and then during descent.  And no space suit in case things leak.

How does he do that?  Haven't heard a single thing about it.

Jeff L