Mega Dittos!
New engine designed for the new fuel.
http://www.thedailybeast.com/articles/2014/10/31/spaceshiptwo-flew-on-untested-rocket-motor.html
Was there static testing? If there was I didn’t see it in the article. Then again pumpkin beer is making me ready for bed.
IMO chemical engines are not the way. There has to be another way into space.