Rocketry!

How does one go about turning a turbine or a piston into a rocket in FSX? I have messed with the aircraft CFG's so much, and I still can't figure it out... Have any of you guy's messed with this? 'Cuz I gotst one wicked idea of putting a Cessna in orbit! (Copyright, pattented, MY IDEA! ;D ) Hehe, help would be highly appreciated, lets get this figured out! ;D Tchus.