Atmospheric deceleration test pod

Hello everyone!
Don't look at it as ordinary and unremarkable, it's a practicer!
Usually, when we enter the gravitational circle of a planet, the hyperbolic orbit that has been fine-tuned is difficult to slow down. At this time, we need to use the planet's atmosphere to lower the speed.
Although the risk coefficient is high and it is easy to explode, after training, we can efficiently slow down without so much fuel, and then accelerate into the orbit around the planet.
Incidentally, we must first know the altitude of the planet's atmosphere, and then raise and lower the altitude near the planet according to the deceleration demand.
Ok, here is the introduction of the exerciser. I wish you all perfect practice!