I do know how to seperate boosters, but they usually are an independent stage. I've never learned how to launch rockets with unresolved stages (next stage starting while previous stage still has an engine running). My current tactic is to build enough boosters to reach orbit, dock with the station, refuel, get to the next planet. I've never returned a craft which has reached it's destination back to Kerbin. Current staging: - 1st Booster stage (liquids + solids) - 2nd Booster stage (usually skippers) - Main stage - Interplanetary + landing stage What I want to accomplish: - 1st Booster stage (liquids + solids) - 2nd Booster stage (solids ran out, decouple, liquids go on) - 3rd Booster stage (skippers) etc.