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Re: building a parabolic with mirrors.
ok thats good info.
the only mirror I could find local was 5mm and 3mm second surface mirror.
I picked the 3mm type.
I have change it from 90% to 75%. I cant see it going much less than 75%
can anyone help with finding the optimal focus point of the mirrors. is there a forumal?
I know that a 2 inch mirror max focal is 19 feet
(2 / tan(.5)) / 12
I had been thinking of setting up a test jig with a black surface and measure the distance to highest temp I can make with 1 mirror. and using white paper and see what is the clearest reflection of the sun in a 2^2 target
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