John Carmack
@ID_AA_Carmack · Nov 22, 2014
@elonmusk Good luck. We had supersonic control inversion issues with actuated fins, went back to little thrusters that worked at all speeds.
Elon Musk
@elonmusk
No choice. Entry velocity too high for a precision landing with N2 thrusters alone. Must have aero surfaces for pitch trim.
01:08 AM · November 23, 2014 · 0 views
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