Group 1 = Eng Tilt, Group 2 = Open/Close the Nose, Group 3 = Open/Close the Tail, Group 4 = Open/Close the Rear Ramp. For smooth vertical takeoff, smoothly spool engines to 29-30% power. I used VTOL nossels to help center the thrust over the cg. She's too hard to land vertically, but for a slow conventional landing, set the engines in the vertical position, and the power to 20%, and she'll land at about 80 mph. You can use the eng tilt to fine tune the speed. They are also good for reverse thrust after landing. I spent a huge amount of time getting her to fly level at full speed. I also put a small cargo of Air Intakes in the back just for fun. If you open the ramp in flight you can get them to fall out the back. She is also amphibious. Be careful opening the back with the engines in the vertical position, it is best to have them in the forward position so the doors don't conflict.