YL-7 Reusable Launch Vehicle V1.0 (with auto-landing Vizzy program)

YL-7 is a 2-stage rocket whose first stage is able to recover and land automatically. You are suggested to launch at DSC Launch Pad, enter 4 parameters and then the program will deliver your paylload to designated orbit. The whole process is automatical.
Compared with other reusable launch rocket with PID control law, in this series (You can find them in my posts), YL-7 uses an entire different control laws, which enhance the reliability and rubustness during the process of recovery and landing.

Demonstration video

============IMPORTANT!!!============
Program will switch between stage1 and upper stage. If you want to recover the stage1 and at the same time send your payload to correct orbit. For a better experience, MAKE SURE YOU HAVE SET THE PHYSICS DISTANCE TO MORE THAN 500KM !!!!

========FEATURES========
1. Auto-landing Vizzy program.
2. 500km LEO capacity: 40,000 kg.
3. Auto-injection to orbit with Apoapsis and Periapsis input.

========NOTE========
1. The default landing position is DSC Large Pad which can be edited in the program written in the Command Chip For Stage 1.
2. Due to the landing accuracy of current version, ship landing may not work very well.