I built this just because i wanted to use the large engines. Instructions: throttle 0-75% for all six engines, 75-100% for any two or four engines. Activate group 1 for the first set of engines, group 2 for the second set of engines, and group 3 for the third set of engines. For landing, turn all engines on and activate groups 4, 5 and 6. Doing this, the engines will release for maximum air control. Tips: use two sets of engines for taking off. If you want to do a lot of flying, you probably want to save fuel. So, you should use set 1 or 2. If you dont plan on landing, feel free to use all the three sets of engines. I hope you have fun and enjoy.