Conversation so far:
How did Sergei get started in his career?
After graduation, Sergei Korolev worked with some of the best Soviet designers at the 4th Experimental Section aircraft design bureau OPO-4 headed by Paul Aimé Richard
Where did working with some of the best Soviet designers at the 4th Experimental Section aircraft design bureau OPO-4 headed by Paul Aimé Richardlead Sergei Korolev?
Sergei Korolev did not stand out in this group, but while so employed he also worked independently to design a glider capable of performing aerobatics.

Question: Was he successful in the design?
Self-contained rewrite: Was Sergei Korolev successful in the design of a glider capable of performing aerobatics?