It's not so much the craft as it is your flight path, as mentioned before. Take this little ship. One of my first successful SSTO's, and if I remember correctly it only had 1 turbojet. Now look here. One of my latest ones. It can actually carry a cargo, something I was quite proud of. (The little thing floating by the nose) So here are my questions. 1 - How fast are you going when you light the rockets? 2 - How high are you when you light the rockets? 3 - When do you pitch to 30, 20, or 10 degrees? 4 - And when do you cut the rockets?