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Old 01-31-2011, 01:23 AM   #1
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Default For all you burners out there

A couple of years ago there was some discussion of fresnel lenses. This kid came up with something that puts my fresnel to shame, in true Archimedes fashion:



More here:

Eric Jacqmain invented a 'Death ray' dish that had the intensity of 5,000 suns | Mail Online
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Old 01-31-2011, 01:29 AM   #2
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Default Re: For all you burners out there

Dude that was an amazing video. The music was awesome too.

-Sal
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Old 01-31-2011, 02:27 AM   #3
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Default Re: For all you burners out there

I've seen this before. Why 5800 mirrors? It'd be much easier to spread aluminum foil over the dish - you'd probably have similar reflectivity, too, considering it covers all the area and it's first surface by nature.
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Old 01-31-2011, 03:19 PM   #4
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Default Re: For all you burners out there

And aluminized mylar would work better than aluminum foil, but the problem would be keep it smooth while attaching it to a parabolic surface. This kid's next project is to build a super solar death ray consisting of 32,000 mirrors!
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Old 01-31-2011, 03:44 PM   #5
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Default Re: For all you burners out there

And if you put Stirling engine on that you'll get free energy. Other thermal engines works too.
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Old 01-31-2011, 07:19 PM   #6
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Default Re: For all you burners out there

I like when he heats up the rock! Makes me whant to build a big one to melt big rocks into thin tile.

Edit: also mabe thats how the ancient egyptians were such good stonemasons?

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Old 02-01-2011, 02:51 PM   #7
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Default Re: For all you burners out there

LOL ..... ancient egyptians was using dry wood and water, mainly
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Old 02-01-2011, 03:06 PM   #8
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Default Re: For all you burners out there



damn cant add the video..
http://www.youtube.com/watch?v=z0_nuvPKIi8

as seen on

somebody asked for a "death sun ray"...
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Old 02-01-2011, 03:12 PM   #9
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Default Re: For all you burners out there

Could one not just take an old TV satellite dish and spray it with some chrome acrylic?

Genius for its simplicity though. This will have to become a summer project of mine.
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Old 02-01-2011, 03:15 PM   #10
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Default Re: For all you burners out there

^ yes, if the paint is mirror chrome and the dish is clean, it may work ..... also, with "offset" dishes, you already have a focus point holder arm (if you don't melt it )
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Old 02-01-2011, 03:32 PM   #11
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Default Re: For all you burners out there

if the dish is textured which mine happens to be. the spray idea wont work.
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Old 02-01-2011, 04:18 PM   #12
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Default Re: For all you burners out there

^Sandpaper and/or paint stripper
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Old 02-02-2011, 09:07 PM   #13
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Default Re: For all you burners out there

You'll still get more accurate results if you aim each individual facet.

I'm sure if you are interested in this sort of thing you will have seen this video of a less-DIY version:
YouTube - Jem Melts Rock Using Sunshine - Bang Goes The Theory - Series 3, Episode 5 Preview - BBC One
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Old 02-02-2011, 11:32 PM   #14
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Default Re: For all you burners out there

But the surface the mirror will be on IS already aimed.
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Old 02-03-2011, 01:24 AM   #15
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Default Re: For all you burners out there

Interesting but I noticed that he's protecting his eyes but has his hand in the peripheral area of the focal point. That much UV is not good for human flesh in the long term. He needs to use a grabstick to avoid that problem.
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Old 02-03-2011, 02:08 AM   #16
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Default Re: For all you burners out there

Like he said, 3 people sunbathing collect that much sunlight.
1 person sunbathing for 3 times as long.....
We already have a highly specialized process in place to deal with the damage caused by ultraviolet light.
The only real danger here is the intensity of the energy causing damage from the heat.
It would be like shining a high Watt ultraviolet light in your eyes and then worrying about cancer. The immediate damage to your eyes is caused by the intensity of the energy, not the potential mutations in the cells involved.
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