Great tree. I've made some mods to this for myself to suit how I want to play a little better (basically not keen on mega-grind as I don't have the time, so I've halved the science values for each node, and moved engineer/mechjeb much earlier in the tree to better see vitals about the rockets/planes i'm building). I've been messing with getting some planes to fly around Kerbin to gather science, but tonight I decided to get something into orbit. All I've researched so far gives me basic SRBs, the LV-909, and FL-100 tanks. The result is the Kerbitarius 4 (being the fourth attempt in the series to reach a stable orbit): This baby will just barely reach 80km if I fire everything prograde all the way there, periapsis tops out at 140km. Re-entry is a bit hairy as the mk25 chutes burn up at 40km, and the main chute isn't enough to slow her down, there's some remaining dV that I used from ~400m to land safely. This tree is hard. I love it.
