Cause Of Virgin Galactic Rocket Explosion ?

[Point Conception]

Carolynne Campbell, a rocket propulsion expert based in the Netherlands said that multiple warnings about the spacecraft s motor and fuel had been issued to Virgin since 2007. " I warned them that the rocket motor was potentially dangerous " Her warnings were related to the nitrous oxide and a new substance derived from nylon plastic beads in the fuel components. This again sounds like management overriding engineers with tragic results.
I understand that the engines were not originally designed for the new fuel.

 

[Danger]

You might start by checking out this subject in the Current Events section of PF Lounge if you haven't already. There are some links to news coverage and whatnot there.