Hi there, after launching this little spaceplane into suborbit (carried by a large aircraft at launch, much like SpaceShipTwo), and safely returning Raysel Kerman to Kerbin, I would like to further explore the field of spaceplanes and SSTO's (picture of my spaceplane after landing): I already have a design in mind, but I have a question regarding controlling the plane: Can you manually enable/disable engines during flight, and if so, how do I do that? I'm asking because I will use turbojet engines as main propulsion until the atmosphere gets unsuitable. Then, I would like to switch to rocket engines (one of the 215 kN ones, plus two LV-N's) for orbit insertion and manoeuvring. The craft's ultimate goal will be to dock with a space station in Kerbin Orbit, or a large interplanetary ship for Laythe, etc... missions. The SSTO will be transporting and returning Kerbonauts. Any help is highly appreciated! Steffen