You can start up the copper fast, but when you try to lower it with "z" it does not have enough effect, making it way harder to get to the target and hover near it than needed.
I even thought it may be mapped to "y" instead of "z" since this is a German keyboard since it felt like it had no effect at all, but it was correctly mapped where it should be, it just takes ages to lower.
Techically: raising and lowering does not change the speed of the rotor, it is rather that the blades of the rotor are tilted to push down instead of up, and therefore it has an _immediate_ and _very_ strong effect if used wrong in a real Machine.
cyclic control (x and c) when the chopper is moving forward should have more effect, making it possible to turn mid-air (at least lower and mid speeds) and fly backwards since the inertia is still to the former forward direction.
4K video recorded of my try and fail will be on youtube soon (I guess two or three days).