This free and open source turbine can be built for half the cost of a 120 watt solar panel, and will produce about ten times the power (5kWh with 3m drop and...
in the end summary he talks about adding a vectorizer to start the flow swirling in the pipe before it hits the blades… that’s a great idea, and it seems like there would be other efficiencies like that to be gained before and after that fan element… also i think i would want to try a fan design that resembled the prop on a boat motor… seems like those would already have the best water displacement efficiency worked out…
in the end summary he talks about adding a vectorizer to start the flow swirling in the pipe before it hits the blades… that’s a great idea, and it seems like there would be other efficiencies like that to be gained before and after that fan element… also i think i would want to try a fan design that resembled the prop on a boat motor… seems like those would already have the best water displacement efficiency worked out…