Check out "mechanical mathematician" on the net. It is basically a simple way to make a parabolic dish. It requires no great knowelege of math and (for poor people) the only outside material needed is kitchen foil. I used it to make a 4 by 4ft solar cooker from cob. (sand clay and straw mix). I see it as an excellent helper for people to make large parabolic cookers with minimal ...
New way to form parabola for solar cookers - SustainabilityForum.Com - Your Global Sustainability Community! | Thread profile
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Thread posts in New way to form parabola for solar cookers - SustainabilityForum.Com - Your Global Sustainability Community!:1.
Started 1 year, 9 months ago (2007-09-29 19:43:00)
by gaiatechnician
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Started 1 year, 8 months ago (2007-11-05 19:09:00)
by Johnny Electriglide
Nice cheapo project. The problem is the structural need of a tripod hook to cooker mount to stay at the focal point and the ability to track with a structurally attached two way pivot and attach. No wonder the commercially available parabolic tracking cookers/boilers are so expensive. Kind of like my full tracking Wattsun 8-75 watt panel system. I use the Global Sun Oven, and have two of ...
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Started 1 year, 8 months ago (2007-11-06 02:24:00)
by gaiatechnician
I am working on another similar idea. A mechanical mathematician to make a large parabolic dome. Then when the dome is made, you just use it as a form for making parabolic cardboard reflectors. Perhaps someone can try making parabolic reflectors on the back of a satalite dish? It should be really easy to do. YOu just make the first bunch of radial cuts, fold down to overlap and then cut ...
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Started 1 year, 8 months ago (2007-11-07 05:23:00)
by Johnny Electriglide
Now I know what to do with an old 30" satellite dish I've good. Next summer I will contact cement foil into it and see how it heats with a pan hanging from the existing focal point bent tube. The other old style big ones could be had cheap at a garage sale, with a little luck.
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Started 1 year, 4 months ago (2008-02-08 03:46:00)
by gaiatechnician gaiatechnician is offline Junior Member
I have a tracking solar accumulating barbecue project on the web and on the solar cookers international wiki. I havn't made one yet. (Awaits the nice weather). Note that the center of a parabola is definitely not used in these barbecues! It will be a slice off the side of the parabolic dish. Serious progress has been made on the project! I have 2 proposals for tracking units processing ...
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Started 1 year, 4 months ago (2008-02-08 03:46:00)
by gaiatechnician
I have a tracking solar accumulating barbecue project on the web and on the solar cookers international wiki. I havn't made one yet. (Awaits the nice weather). Note that the center of a parabola is definitely not used in these barbecues! It will be a slice off the side of the parabolic dish. Serious progress has been made on the project! I have 2 proposals for tracking units processing ...
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Started 1 year, 4 months ago (2008-02-11 05:20:00)
by windy1
These solar cookers are a great idea, but I guess that they need to generate quite a large quantity of heat in order to cook something like a chicken, rather than just attain a high temperature. What sort of diameter must the parabolic reflector be to make a reasonable cooker? Are there any dangers that the heat produced could burn the person using the oven?
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Started 1 year, 4 months ago (2008-02-11 09:29:00)
by MartinSykes
Coming to a garden near you - the solar-powered barbecue | the Daily Mail Incidentally if making something yourself and you're painting the parabola, from research for my aquarium, bright white gloss paint is a better reflector than silver - think about how hot a piece of metal gets in the sun and why mediterranean countries paint their houses white rather than silver. A parabolic...
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Started 1 year, 4 months ago (2008-02-11 09:34:00)
by gaiatechnician
About 1 meter wide should be fine. I am hoping that the more advanced ones will have a gauge on them. Say they reach 300 C in a 50 kg lump of rock salt at the end of the day, then the final temp of the 50kg + the turkey can be figured out (allowing for gradual heat losses from the insulated lump of course . I do not know the weight or heat capacity of turkey because I did not see it on ...
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Started 1 year, 4 months ago (2008-02-11 09:56:00)
by gaiatechnician
The tracking solar accumulating barbecue will look nothing like that barbecue. It does not heat the food directly, rather it accumulates the heat in a large insulated vessel (like how a hot water tank accumulates the heat from its element) Among the suitable materials are Iron aluminium, parafin, rocksalt, granite or limestone (or a mixture of these materials). For instance an aluminium ...
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