About this 3D model

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 easier to adapt. Ideally you should use a 6006 bearing with a 30mm ID and 55mm OD. But I had a 6806 lying which is not well suited but will do for testing. I have not printed any of the parts yet as I came to find out that Autodesk has ruined another great product (Netfabb basic) and removed the ruler to take dimensions. There are old versions on the net, but this is just silly. The design is cheaper to make as the bearings are cheaper and standard size, the axle is plain central heating tube (7 euro per 2m) and less material in general. 2015-06-09: Uploaded the entire turbine again, if you need any of the old parts you need to contact me manually. This one has all the correct dimensions now as well as some updated designs for the NEMA mount and other fine adjustments. I've also uploaded a video from one of the first test with the NEMA17 stepper, this was the wrong model, they came from eBay unstickered. 2014-09-23: I've gone back and checked on the dimensions of the blade here and it's woefully off. I've used the inner diameter instead of the outer diameter of the windmill giving a far too small blade. The actuall outer diameter is 45cm across, not the 32 I once thought. Oh well. I've redone the blade but need to verify it's ok before I upload that. https://www.youtube.com/watch?v=KUVS09pbNOk I've decided to go to a 24 degree rotation per layer so you can now make it 5 layers high which is a 60% increase in swept area. That coupled with +20% extra swept area from the correct blade size (66mm vs 84mm J cup) should make a lot off difference. I've found out that 2 meters of M16 threaded rod is readily available which made me go to 5 layers. that would give 5x20cm, or 5x30cm on a larger 3D printer. For now I'll just make 3 layers for testing until I aquire a longer threaded rod. I've found a tool for proper blade design in the form of EasyCFD, but it's a 180 euros. So that's a bit steep for a personal investment. I've already poured in quite a bit of personal R&D money in this thing over the past year in small increments. But a once off purchase is just a bit steep. That or I need to learn OpenFoam. 2014-09-08: I've uploaded a few new and updated pieces - Uploaded Center hub type D again incase I missed something. - Uploaded drilling guide for the square wooden pole, attempting thise mount soon. Drill small 4mm guide hole, then drill with long wood drill. - Added 2 spur gears I got from solidworks gears files for mounting on the new rotor hub. - Added newer rotor hub that has a few more holes for mounting the spur gear and has a clamp. If you have the clearance for it you could mount the spur on the bottom of the hub. A larger 100 tooth spur gear should follow. 2014-08-29: I've just uploaded another M16 rod NEMA17 motor mount, it is meant to be used in combination with a 68x68mm wooden pole. The idea being that you drill a 16mm hole 30cm deep into the center of the wooden pole where 30cm of the rod goes and the square motor mount sits on top. This further reduces the amount of parts involved, and this is a common size in europe for wooden poles. The trick part is getting the deep hole straight and center, i'll upload a drilling guide shortly which should make it easier. If you have a good flat surface this becomes quite a bit easier. One drawback is that if you use a Hall proximity sensor like I do, you need to chamfer one edge of the top of the pole to make that fit, I will include that hole in the drilling guide regardless. If you don't need a RPM senso