K's Rocketplane is a prototype capable of high stratosphere flights. It has a second stage rocket booster. --- Normal takeoff throttle 100%, climb with about 15* until you reach 1200mph. Than ignite the rocket booster! (Activation 1 -only use it for stratho-flights ) It will create an enormous amount of thrust. At about 45000 ft shut down all engines. You will have enough speed to reach hights of over 135000 ft. After reaching the max altitute just let it sink on his own until 20000ft, start the jet engines and fly home. You dont need any controls once in stable ascent, its trimmed for that. BUT certenly you can also do all kind of crazy thing it can stand max g-forces und is so fun to fly. Hope you have as much fun as I do :-)