I remembered seeing this in the first avengers, and decided to set out and build it. It transforms from hover mode (slow mode) to normal flying (fast mode). Start by selecting 1, and moving the slider down one notch. Increase speed to 100% and after about 3 seconds or so, side it back to the middle and you should be in the air. Once you reach at least 100 mph, you can change between the two modes. Also, I added a cargo bay that opens and closes by pushing 2. For challenges, short takeoff is just the same as taking off normal, and for short landing, you can slide the Vtol bar to the top to act as a air brake to stop you. I hope you enjoy!