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Re:SpaceshipTwo crashes shortly after Mojave test flight by Florin_Andrei on Friday October 31, 2014 @08:12PM (#8541736)
A hybrid has a few other failure modes too. One is called hard start:

http://en.wikipedia.org/wiki/Hard_start

Another - nitrous oxide can become explosive in gaseous phase. If enough of it became gas, the oxidizer tank may have exploded.

There are also inherent instabilities of hybrids - higher pressure accelerates the burn, which increases pressure, which...

We'll know more after they finish the investigation.

Re:SpaceshipTwo crashes shortly after Mojave test flight by TrevorJ on Saturday November 01, 2014 @12:08AM (#8542158)
Based on eye witness accounts saying that the engine appeared to fire once more after a flameout, the hard start scenario may indeed be at play here.