Thanks! Yeah, it seems a lot better to have it spinning faster, truth be told I'd love to have a 4kg bar spinning at 8000rpm... but the likelihood of that either happening or not tearing itself apart is just not too high at all haha. That is something that is quite a bother too, the weapon motor - the NTM 5060s, I've heard, are pretty monstrous when it comes to their power output but it's certainly something I'll have to keep an eye on...

Whilst I'm on the topic of all this, what type of software is good for designing spinny things like this? I think it might be a case of playing about with designs and plugging it all into that equation, see what hits hardest!