Lenz2 Helical Turbine XL
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This is a larger version of the Lenz2 Helical turbine I started with to see what size I can get out of my Mendel 90 reliably. It is based on my earlier work in thing http://www.thingiverse.com/thing:87819
Update 2020-02-10
There are a fewq requests for older bits and I've decided to just link to the related Google Drive folder. See if you can find it.
https://drive.google.com/drive/folders/0B0wheAwr-dLxMGtvNGRocEhBU2s?usp=sharing
2018-06-22: Updated the OpenScad, and it should actually fit together without issue. Currently I'm not using the LG drive unit yet but a Hobbyking 53kV 4008 Gimbal motor (~25$) with a 17T pulley and a 112T pulley on the axle. That is good for a 5.8:1 ratio and at 150rpm that is good for ~38 volts open circuit. It is enough to trigger the Chinese grid-tie 22-60V inverter. A Hobbyking 6508 (30kV) Gimbal motor should be arriving soon which should make the motor pulley a bit easier to size. The current T5 belt is a T5-600-10, which is a bit short, a 690 is on order.
I did try to model the Lenz2 blade in Openscad but it is a bit heavy, so commented out. I need to do this with a proper OpenScad module which needs a bit more research. Alternatively I could just import a rendered STL of the blade.
2018-06-12: Redesigned most of the rotating parts of the turbine into OpenScad. Took far less time then I thought, but not trivial. This is once more for the LG direct drive washing machine motor. And with the design now in OpenScad format it's far…
