_Finally_ managed to come up with a sealing option that should work. I went through a couple, some of which actually kind of worked ok, but this one's the winner.
Completely sealed, very low resistance. Just a previs at the moment, I'll get some video of it working when I can.
The Solarflower is an open source solar energy collector which can be made very easily from common recycled and salvaged materials, using basic tools and skills.
It tracks the sun automatically through a simple non-electrical mechanism, can be made almost anywhere, is portable, has no running costs or emissions, and can produce up to kilowatts of power per device.
Applications include electrical generation, water purification, cooking, bio-char and charcoal, heating, gasification, and whatever else heat can be used for.
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