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Hi Doober, thanks for the feedback much appreciated.
I'm going to be working on a MkIII design with a goal of 10x the power ~50 watt, I have some concepts i'm working on. The easiest way to make more power with this turbine is to increase the spring stiffness to reduce the un-pitching at speed, be careful though as the speed goes above 600 RPM the vibration increases and component failure is more likely (plus its pretty scary to be around at those speeds). I did a test when setting up the PVP with fixed pitch blades and got the turbine well over 1400 RPM, at those types of speeds its possible to get 24volts 1 amp. I will record a video and post it up soon...
Bearings/tower size, check. I will consider more widely available and cheaper bits. I like the parts you have designed the pegs are a great idea, I ruined 2 blades when the Turbine fell over!
Thanks For your support and its great to see your print!