Launch systems
Aquila looks like Direct - but then good engineers often realize the same solutions to constrained problems.
Fors his flybakc boosters in the Starchaser series, Dr. Aldrin proposes liquid flytback boosters with
fixed wings, not the drag parachute folding wings that Energia proposed for use withe the Zentih booster.
I wonder if Arianespace will adopt something like one or the other for use with Ariane, or in their next series of
launchers. Their commercial competitors will be SpaceX's Falcon and China's Long March 5 - what's happening with Angara, I don't know.