From:
Sent: Friday, June 05, 2009 4:34 PM
To:
Subject: Re: [papercreters] Who's making wet slurry this weekend?
Oh, another small project/experiment. I had a couple of satellite dishes lying around, the small oval ones. A couple of days ago I slapped papercrete a couple of inches thick on the dish, using the dish to make a parabolic surface. After it gets really well cured then I will attach small mirrors to use it as a solar concentrator. Why not just use the metal dish covered with mirrors? Because it's not papercrete! No, really because I can make several pc dishes from the same mold and then I'll have several to experiment with. I already covered one with aluminum tape and set a 1x2 on fire in less than a minute, so I'm pretty sure it'll warm a cup of tea with 1" square mirrors as a better reflector than the aluminum tape.
Spaceman
He spaceman,
If you have time and want to do a big one tape some Mylar to a hoop, shiny side in, add another layer of any kind plastic and inflate. Spray papercrete on the back of the Mylar and when it’s dry cut off the second layer of plastic and you should have a smooth Mylar covered reflector. I haven’t tried it yet but I think it will work. I hauled rocks sand and top soil into the planter beds n the greenhouse today. It must have climbed into the mid 50’s F
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