i just used your rocket as a simple test to orbit kerbel. i then saw that i had enough fuel to orbit the mun and return. as i speeded up time i managed to pass the mun with only 10000 km from the surface its gravitaion changed my course and trowed me out of the planets system. i then saw that i have now managed to orbit the sun. i still got 20% fuel left from the final stage. Awesome rocket!!!