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Posted by Duane C. Johnson on November 9, 2008, 5:09 pm
 
Morris Dovey wrote:

 > Robert Scott wrote:

 >> Regarding curved mirrors, the cheap thin mirrors
 >> that you can buy to hang on the wall are actually
 >> quite flexible. One might consider bending them in
 >> a fixture. Any guess as to what radius of curvature
 >> could be achieved without risking fracture?

 > An interesting question...

 > You'll want to capture the ends in a pair of
 > swiveling clamps and press down on the full width at
 > the center in 1/8" or 1/16" increments so you know
 > how far it bent before fracturing.

 > I'd be interested in knowing how well the silvering
 > withstands the bending process, too.

 > I'll contribute the first $ if you'll post the
 > results here...

I have mirrors 2' x 8' x 1/8".
I just lifted from the center using a vacuum tool.
I lifted the center about 2.5 feet.
That's a lot of curvature.
Mine haven't broken yet and it's been over 10 years .
Of course this curve is a Catenary but the parabola
pretty close

Duane

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Posted by Morris Dovey on November 9, 2008, 5:29 pm
 
Duane C. Johnson wrote:


Good information! That tells me that 1/8" glass should work for
parabolic reflectors up to /at least/ four times the focal length in width.

Good to know - thank you.

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/

Posted by Gordon on November 9, 2008, 10:57 pm
 

 “That’ll melt almost anything known to man,” says Sandia engineer Chuck
Andraka. “It’s incredibly hot.”

Anyone else catch that quote?
I wonder what they make the stirling engines out of.

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