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"Designer" for solar reflectors - Page 5

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Posted by brian white on November 20, 2009, 3:34 am
I think you might be right if the target was a point. But it isn't.
  And if the reflector was collecting light from the whole sky. But it
In my case, the reflector is going to catch sunlight from a 30 degree
wide segment of sky above the reflector and reflect that light on to a
target that will be at least 6 inches diameter.  No other piece of sky
is involved.
I believe that can be done.
I have not got proof yet because i have only started to make my first model.
Robert Scott wrote:

Posted by Josepi on November 20, 2009, 3:42 am
A commonly used parabolic reflector does this quite nicely. Just place a
larger target area in the zone and let the reflector get misalligned.

The horns look quite interesting but the multiple pettles are just too
expensive to make with so many trackers.

You gave the impression you were involved in the subject company in the
video. When people picked it apart you appeared defensive. The first part of
the movie and basis of your post was the parabolic shape was not the best
and then link to a movie that clearly defends the parabolic shape after a
bunch of nonsense.

Posted by brian white on November 20, 2009, 5:04 am
 I agree, the horns are the interesting bit. The parabolic petals are
silly.    I guess I did not give enough info in my post.
Sorry for that.
For practical solar cooking, parabolic dishes give lots of power but
people are having trouble because they have to adjust them constantly
and they are getting flashed in the eyes way too often too.
I think that maybe the horns can eliminate both of those problems.
I believe that you only need 2 horns (not the 6 that gross shows). I
could be wrong of course.
Also, You could do the horns "dumbed down" with just 4 strips of
material to make a squareish horn.  The key is to get reliable and
pretty constant heat delivery without moving the device for 2,3 or 4
hours.   Parabolic dishes simply do not deliver this in a non tracking
It is just an option. Perhaps it is not good enough.
  I was just opening it up to the general public.
Josepi wrote:

Posted by Josepi on November 20, 2009, 2:38 pm
 Trouble is all this low tech stuff really takes hgh-tech to make it all worl

It's like bait and switch by the user himself.

Posted by brian white on December 2, 2009, 2:23 am
 Anyway, for those of you that are interested in designing solar cookers,
  I put 2 videos on youtube to further explain what I am trying to do
here.  The second one shows the basic shape of the reflectors.  Just a
mock up because I have not yet figured how to hold everything in place
as I "design" the reflector.  I think the real reflectors will be more
"scallop" shaped going to tubular towards the middle.
The videos are


It helps to watch the first one but perhaps all you need is in the first
5 minutes of video no 2

brian white wrote:

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