Hybrid Car – More Fun with Less Gas

Re: Vs: How to produce cheap mirrors?

register ::  Login Password  :: Lost Password?
Posted by Roger Gathright on June 24, 2003, 9:01 pm
Gee, what's wrong with aluminum flashing polished to a "Mirror" finish and
formed around a wood frame to give it the curve (cylinder radius) you want.
It works for me.  But I only use it to distill Alcohol!

Posted by Raleigh Myers on June 28, 2003, 4:29 pm
Raleigh Myers


Check out off axis parabola





Posted by Duane C. Johnson on June 28, 2003, 7:28 pm
 Hi Raleigh;

Nice to see your web page up again.

    Home of the $5 Solar Tracker      Receiver
   http://www.redrok.com/electron.htm#led3X  [*]
  Powered by             \  \     \        //|
 Thermonuclear   Solar Energy from the Sun / |
Energy (the SUN)           \  \     \  /  /  |
Red Rock Energy             \  \     /   /   |
Duane C. Johnson   Designer  \  \  /  \ /    |
1825 Florence St  Heliostat,Control,& Mounts |
White Bear Lake, Minnesota    === \   / \    |
USA      55110-3364                ===   \   |
(651)426-4766        use Courier New Font \  |
redrok@redrok.com     (my email: address)  \ |
http://www.redrok.com   (Web site)          ===

Posted by Tim Lacy on March 28, 2005, 7:41 am
 Mylar film on the support surface of your choice.

I believe a search will reveal Nick's method of building a Very Big Parabola
using 2x4's and mylar.  Use grease to 'glue' the mylar to the forms... I'm
sure it's in the archives somewhere, or search

Mylar is a great reflector, and it's cheap.

Posted by Brian Sanderson on March 30, 2005, 3:39 am
 Go ya one better...

Find yerself an airtight cylinder.  (the originator of this idea suggested a
"plug" used as part of the packing for commercial jet engines; it's a
shallow, wide cylinder, open at one end - abt. 3 ft+ diameter...)  Stretch a
mylar sheet across the open end and fasten it to the rim.  Attach a vacuum
fitting to the backside and draw out some air from the interior space.  If
it is sufficiently flexible (and you achieve an airtight seal), the mylar
will form a concave surface - in fact, a perfect concave mirror...

...idea originally inspired by a sheet of cellophane covering a glass bowl,
taken out of the microwave...

PS: I realise there are several practical problems with this idea, it's not
perfect, but it /might/ be worth an experimental try...?

This Thread
Bookmark this thread:
  • Subject
  • Author
  • Date
please rate this thread