Quote:
Originally Posted by ApS
Perhaps to make it more expensive, the $129 "Gen-Turi" (" system") has a one-inch gap in the pipe.  My BIL's simple pipe has a straight run, and is astonishingly effective.
As for rain, a "T" installed at the bottom would collect any rainwater that might find its way down the narrow pipe. I'd have to ask if he made a little cap on a stick to cover the opening when the generator's not in use. 
Flappers send out metallic "pings" at low operating speeds; also, I would think all designs would need to be cut off "square" at the top in order to be effective against noise.
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True about the flapper, my old Farmall clanks while idling, but at working speed (it is the backup power for our PTO generator) it is quiet.