Saturn V rocket. Still sort of working on it, as it still has a few hiccups. Some attatchment issues, but mainly stability in flight, but the stability issues can be avoided by making sure to power down and disengage each stage's engines before separating the stage. The activation groups are organized as follows: AG8: Engage/disengage stage 1 engines(starts on), AG1: Separate stage 1; separate aerodynamic tower; engage/disengage stage 2 engines, AG2: Separate stage 2, AG3: Separate stage 2; engage/disengage stage 3 engines, AG4: Deploy stage 2 parachutes, AG5: Deploy Lunar Module; deploy stage 3 parachutes, AG6: Separate Lunar Module, AG7: Deploy capsule parachutes. Enjoy and improve!