Nice work Al, I like your turbine! What are the dimensions that you used in terms of diameter, width, and vane size? Are the vanes cut from thin-walled tube? if so, what diameter was it? I am thinking of trying to build a new turbine to replace my squirrel cage fan, and this looks a lot like what I was envisioning. I remember finding a bunch of formulas to design an “ideal” crossflow turbine, but seem to recall that with my rather small flow rate, i got some weird dimensions. I have about 200 gpm (0.0126 m^3 / sec) coming down my pipeline, and i have a net head of 14’ (4.25 m).
My experience so far is that the intake for my penstock is the weakest link - but with only 3 feet of head, are you going to have to pipe your water far?
My feeling on the flywheel is that it might not really be needed, but it probably cant hurt. My guess is that the water will spin it up just fine, and then it will help keep a nice consistent output RPM.
I will also weigh in and say that batteries would probably be a much easier solution than trying to run an inverter directly. the speed your turbine is going to be spinning will depend on the load you place on the generator - it would be a nightmare to try and get it to regulate itself, and you dont want the whole thing to just stop if you apply a load that is larger than the max output it can handle.
Looking forward to seeing it up and running, keep up the good work!