Tu-144 flew before Concord. Try to explain to some people that it's hard to get a pure copy running before the original :) - I'm not surprised anymore, they'd still insist Tu-144 is merely a copy.
When Project Apollo uses Yu. Kondratyuk's (A. Shargey) staging calculations of course that's not a copying of a critical part.
When Project Apollo uses Yu. Kondratyuk's (A. Shargey) staging calculations of course that's not a copying of a critical part.