Blades can change everything. To have the same performance as what the Dan's have done you would need to duplicate everything exact. It's possible you could have a very respectable set up of your own as is with adjustment. Maybe not the opinion of others here or even the best way to go but I have worked the variables for quite some time to tweak my own system which is unique also (direct heating). You can always wind another stator. Just my thoughts,  Dave B.

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