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Re:SpaceX returns to flight with Falcon 9 rocket launch by babyrainbow on Sunday January 15, 2017 @07:09PM (#13407345)
>bow shock created by the engines is enough to serve as an ersatz heat shield

Source pls. Google search yeilds no results.

Re:SpaceX returns to flight with Falcon 9 rocket launch by kirrent on Monday January 16, 2017 @04:47AM (#13409076)
It's an over-reach of me to say that they discovered it. This talk gives a good outline of SRP. https://youtu.be/GQueObsIRfI?t=983