I use the engine to control the yaw after losign the virticle stabilizer. Its very easy actully, just select a outboard eng and when you turn either lower its power or increase its power to compensate. I.E. If turning left, and tail starts to slide out, just decrease power to #4. This will bring you back to center and then bring your power back up. And be sure not to bank as far next time. I don't know how realistic it is, but it is very easy to stay in somewhat of a "Controled" Flight by useing the engines individualy.