Version 2. Still a work in progress. Feel free to update or improve upon the design. For robot mode to truck: slide the VTOL control down, then activate groups 1 - 6 in order. Let each stage complete before activating the next group. Deactivate groups 1 - 6 once the transformation is comlete. Pitch controls throttle, and yaw is steering. Truck mode handles best with the engine power set to 200HP. To go back to robot mode: straighten the truck and trailer, slide the VTOL control to the... e middle, then activate groups 6-1 in order. Allow each stage to complete before  progressing. This has been tested on iOS with all settings maxed out. Sometimes he still explodes. Group 6 can hide/reveal mini guns. Be sure not to shot the guns unless their side panels are not Group 7 detatches the trailer. VTOL down allows. Trailer stand to deploy. Once the trailers detached, Optimus can not be stood back up. He skips leg day too often. There are a lot of bombs in the trailer. Have fun shooting up the trailer when you get frustrated. However, don't get close while shooting up your own trailer.   read more