Indeed, very interesting, thanks for posting!
I've also got some questions:
- Why do you build your models from Elektroprivreda Srbije?
- What is the modeling paste made of? - if that's no company secret
- In the CAD pic, what does CP mean? Is this the drag of the boot in the water? I'm a little confused, as I know Cw for the drag, which doesn't go under 0.