Throwing and catching are reversible operations, like a regenerative brake in an electric car. Even if your tech is too crude for a regenerative catcher, at th

Throwing and catching are reversible operations, like a regenerative brake in an electric car. Even if your tech is too crude for a regenerative catcher, at the throwing end you could still finesse the rocket equation with a https://en.wikipedia.org/wiki/Mass_driver https://en.wikipedia.org/wiki/Mass_driver See also https://en.wikipedia.org/wiki/Skyhook_(structure) https://en.wikipedia.org/wiki/Skyhook_(structure)