Just set up the variables to values you like, and the PRESS SPACE! Fuel: Mass of fuel in your rocket. Velocity of decreasing fuel mass is defined by fuel flow. Mass also means gravity: so "More is better" don't rule always. When you're out of fuel, you just start slowly falling. Fuel flow: More fuel flow means greater force, but also it means faster decrease of fuel. Angle: It don't need description. Try turbo mode, it will not change results.
I like rockets. OMG Featured! Thanks a lot all of you!