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I agree a positive displacement pump would be ideal and likely more efficient.
The weed wacker engine is an interesting one. Too bad I just gave away my old one haha.
With positive displacement pumps you have a problem with how to lubricate it. Any ideas how to solve that?
I still like the turbine idea because its super simple (besides making the turbine, which I do think a DIYer can do). RPM would definitely be something you'd need to test to get right. You'd have to select a range of PSI that would be useful and if it dropped below that close the jet to rebuild pressure. Of course, we may have to do that with a positive displacement pump too... I dunno, I still just like the simplicity. Less moving parts, no friction, no maintenance basically.
Anyone know how industrial power generators work? Most power plants use heat to make steam to generate power.
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