Thanks guys I was building some more and I made discovery (revolutionary I believe! )... space fleet without fuel is just a space junk, so we need tankers. V-SLight tanker initial 82 parts ~280t tank + engines 48 parts ~32t engines 34 parts 13t tank without engines 6 parts 18.5t Single tanker is boring, but once we have more of them on orbit, we can connect them... Better, but engines in front and back are bad... time for 180 turn... and connect both engines modules Now we can take that fuel far away If you need only 2 engines it is fine, you can land and recover other 2 on planet... just undock Break with engines on 100% V-SLight tanker.craft Enjoy