This craft uses two mods: KW Rocketry and B9 Aerospace This is... The Griffon Shuttle System! This is still a prototype, but it is possible to put the orbiter into orbit, the landing is a little bit more... hard. Lift-off needs some preparations (Like the real shuttle in fact): 1°) Activate first stage, then activate action groups "1", "2", et "3". (with upper numerical keypad; &, é and ", on azerty keyboard) Key "1" disable the pair of orbiter's reactors and keys "2" et "3" disable the pairs of "stabilizing" reactors. 2°) Once the reactors were disabled, throttle and lift-off! 3°) When the orbiter bascule on his back (due to the tanks dump), press "2" and "3" to activate the stabilizers reactors to maintain the craft right. 4°) Once all tanks and boosters are empty, drop them and press "1" to activate orbiter's reactor, and let's roll! p.s: The big grey tank never empties, he is just a counterweight. Download here : http://www./?qthw8uubrdrpbic (Put the file into SPH folder, not VAB) Hope to have been clear (i don't speak english very well!) and good luck to fly this monster!