Bottle Rocket Launch Tube and Snow/Ground Spike

For the traditional German "Silvester" fireworks on New Years Eve I made a launch tube for bottle rockets including a ground spike to fix it properly.
The idea is to have a design that is semi-disposable and doesn't involve dirty glass bottles that tip over from the smallest bump in the ground. Also, the launch tube can be rammed into the ground perfectly vertical ensuring a safe ascend of the rocket.
After testing it with about 30 rockets last year I'm pretty happy with the design. There ar