Instructables - Simple Solar Cooker

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Home Sign Up! Explore Community SubmitSimple Solar Cookerby yaaaay on January 18, 2006Table of Contentsintro: Simple Solar Cooker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2step 1: Measure two boards 4:1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2step 2: Use a rope, heavy string or chain to trace curve from top corners to bottom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3step 3: Cut out curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3step 4: Attach boards to a base of same length but width can vary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3step 5: Cut a flexible board of the same length as rope/chain in step 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3step 6: Glue tin/aluminium foil or broken glass/mirror to board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4step 7: Attach flexible board to curved cut out. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4step 8: Show how to use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4Related Instructables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4Advertisements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4Customized Instructable T-shirts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ker/

intro: Simple Solar CookerSolar cooking for the worlds poor.*The aim of this project is to create instructions for a Solar Cooker that can be sent to developing countries. For this to reach the widest population the instructions mustbe non-language based and that it can be constructed with the barest minimum of tools, materials and skill.The instructions should be as simple as possible so that they can be easily hand drawn and modified.The cooker will use the curve of a hanging rope or chain which will be approximatly parabolic. (google catenary if you do not know why) This shouldn't matter as acatenary gets closer and closer to being a parabola the wider you stretch it and we are focusing on a pot, not a point.The dimensions are important. Using a 4:1 ratio means the focus will be in the middle along the top of the cooker in line with the two ends which makes setting it up reallyeasy. (See step three)The materials could be anything from corrugated cardboard to plywood with aluminium foil to broken glass for the reflector.I have not made this at all as I do not have the space (tiny london flat) and the required sunshine.If someone builds and tests this cooker it would be great to hear about your experience and please make improvements!I have placed this in the public domain, I want this idea to grow, mature and most importantly be used. HAL 9000 EDIT Or for recreational, less heroic purposes. I, for example, will be taking this with me to Burning Man '07 as a practical, green way of cooking my food. how about cookinghot dogs? you can use this where you may not be allowed to use a barbecue, and it requires no fuel or lighting. Instant heat!step 1: Measure two boards 4:1If you can come up with a clearer way to show a 4:1 ratio, do oker/

step 2: Use a rope, heavy string or chain to trace curve from top corners to bottomThis really needs to be clearer.The images needs to portray that you can use any heavy rope or chain and that it goes from one top corner to the other and reach the bottom.It is also clear that there needs to be extra material for strength along the bottom.step 3: Cut out curveImage Notes1. Focal pointstep 4: Attach boards to a base of same length but width can varyI've left the attachment method to the ingenuity of the builder as i cannot make any assumptions to what tools or resources the builder will have.What I don't know how to do is indicate on the diagram that you can have any width to the base. Any Ideas?step 5: Cut a flexible board of the same length as rope/chain in step 2.As mentioned by Hal 9000 you can use the length of the chain/rope in step 2 to measure the length of the reflector. This way your length will turn out perfectly, and youwill have no trimming at all once you have mounted it to the cooker base.An improvement to the diagram would be to draw it slightly curved to show that it is to be lar-Cooker/

step 6: Glue tin/aluminium foil or broken glass/mirror to boardstep 7: Attach flexible board to curved cut out.step 8: Show how to useThe cooker can be tilted along it's length and rotated so that the sun is always in line with the focus.(I admit that the main picture of this project makes it look like the cooker remains on it's flat base)Related InstructablesMake a"compound"parabolic solarcooker fromelection signs!by gaiatechnicianAdapt a clocktoday! Cheaptrackers boostsolar panel andsolar cookerperformance. bygaiatechnicianOpticsexperiments onthe cheap(video) bygaiatechnicianDIY 2 bucketdripper trackerfor solarcookers andsolar panels ischeap and itworks! (video)by gaiatechnicianAdvertisementsCustomized Instructable ar-Cooker/Solar paraboliccooker with themechanicalmathematician!by gaiatechnicianLet's go green!Build a SolarPoweredParabolicCooker! byWeissensteinburgClock Basedsolar trackerexperiment(video) bygaiatechnicianArranging yourlife ecologically,ethically andsimple byGreen Anarchist

Comments27 comments Add Commentgaiatechnician says:Oct 4, 2008. 1:56 PM REPLYI began experimenting with solar cookers with "compound" parabolic dishes this September. I found them to be far better than parabolics for what i did.My cooker gets 3 hours of collection with having to move the dish.I wonder is there an easy way to make the compound parabolic shape?I have now done the dome mold thing I suggested and it works really well.And i made an instructable and have a template for the compound parabolic dishes.Just in case anyone is interested.Brianyaaaay says:Jan 19, 2006. 10:40 AM REPLYCould even use a polished un-rolled 40 Gallon drumb.static says:May 15, 2008. 6:43 PM REPLYBut that would be a cylindrical reflector that doesn't focus on a single point or htmlEven if the drum has a white coating or lining, I would think more reflective surface would perform better. Not that I'm saying one shouldn't give it a try ifthey have the drum. One drum would make 2 cookers if it works.yaaaay says:Jan 19, 2006. 10:44 AM REPLYThis would be used as the reflector and strong enough to not need a back board. Although you'd probably need something like plywood for strength.yaaaay says:Jan 23, 2006. 9:23 AM REPLYTo clarify:Although you'd probably need to build the whole thing out of something like plywood for strength.gaiatechnician says:Oct 28, 2007. 7:02 PM REPLYFirst, it seems that deep dish parabolic solar cookers are best.Second, it seems that it is hard to make them (though I have made a 4 ft by 4 ft one from cob and it was a good first model).Why not this idea?1 Design a generic deep dish. Say 4 ft round,Then design a dome that it fits exactly over.Then send instructions for making the dome around the world.The dome might have a hole in it to just below the focal point (to easily mark the point).Build the dome centrally in villages.People can then use the dome as a form for making cardboard, or cob or mud or daub and wattle parabolic bowls!They do not have to completely cover the dome to succeed.No need to make exact cuts either!You make the first radial cuts in the cardboard, you fold the cardboard in and cut and tape to match the parabolic dish.It might be pretty quick!Perhaps try it with the outside of an old satalite dish as the dome?I dont have one.gowithflo says:Jul 21, 2007. 2:14 PM REPLYI'm gonna try this out! live in New Mexico so I know it'll work great. Especially for my plan to kill bermuda grass (with boiling water in a galvanized wateringcan).Why dont you add this to the full belly project group? (designs for third world solutions).yaaaay says:Sep 29, 2007. 2:34 AM REPLYHi,How did it go at Burning Man? (so jealous)Did you try out the design?kellusion says:Sep 21, 2006. 4:41 PM REPLYa lot of the designs on the solarcooking site make use of the greenhouse effect to trap heat ed air aroudn the pot. i don't think its essential, and ive neverbuild a parabolic one, only the box style, but it might be worth considering. oven bags are a popular and relatively cheap solution, since they're clear andwithstand the Cooker/

gaiatechnician says:Sep 23, 2007. 12:31 PM REPLYI have found the bags to be really important. You can easily boil water with the bag around. No bag and the air dissipates heat rapidly. That comes fromexperience with funnel cookers and with parabolic cookers.SacTownSue says:Jul 24, 2007. 7:50 PM REPLYThis reminded me of somethng I saw a couple of weeks ago which I cannot find right now.I think they used a box lined with foil and somehow placed inside it an aluminium roasting pan that had been sprayed black on the bottom and placedinside the roasting bag that was tied shut.I've been working on a design of my own which is adaptaions of others. Planning on using the cooking bag. My design won't work for the outback tho. It'svery much a city version.SacTownSue says:Jul 24, 2007. 8:58 PM REPLYHere's the one I found a couple weeks ago:http://www.re-energy.ca/t-i solarheatbuild-1.shtmlpuffin juice says:Jan 12, 2007. 6:02 PM REPLYThis website is where I got my inspiration from to build one of these solar cookers http://sci-toys.com/scitoys/scitoys/light/solar hotdog cooker.htmlAnd this has got to be one of the best DIY websites for solar cTownSue says:Jul 24, 2007. 8:40 PM REPLYI really like that one on scitoys.compuffin juice says:Jan 12, 2007. 6:07 PM REPLYI have personally built the solar funnel cooker and was impressed with its simplicity and effectiveness, If you build one though I would advise not to usecorrugated card because it doesn't bend nicely instead use flexible card as it will form a smoother funnelgaiatechnician says:Sep 10, 2007. 6:19 PM REPLYI made funnel cookers too. The only problem is there is a size limit.You really have to match your pot size and your pot placement to the size of the funnel. You can make a huge funnel but you have to have a muchlarger pot as the light will mostly miss a smaller one.Has anybody tried a black painted oven bag round a small pot in a solar funnel? The bag might heat the air really hot and transfer the heat to the littlepot? Thats the problem with funnel cookers, placement. Really they should have a long flask in the centre of the funnel part pointing at the sun.HAL 9000 says:Apr 30, 2007. 8:25 PM REPLYVery nice idea! i like it, and i have a suggestionthe length you will need in step 5 is the same length as the chain/string you used in step 2. no guesswork, just use the string ad your guide.yaaaay says:May 3, 2007. 2:12 AM REPLYYes of course, that is a really simple solution.Thank you, that does make sense.I'll update the text instructions now. One day I'll improve the diagrams too. (Unless of course you would like to :-)blodefood says:Apr 7, 2007. 12:57 PM REPLYThere are solar box cookers that can be home made for a few dollars or you can buy them manufactured in the hundreds of dollars.The solar box cookers are being made for developing countries where firewood is scarce. The device virtually eliminates the lengthy time needed forfirewood collection which can be spent on other activities.Something which I don't see very much in instructions for making solar cookers is cautions around looking at solar cookers. The reflected sunlight ispotentially damaging to the eyes.yaaaay's line of thinking is helpful though. We need more people who think this way.norml says:Jul 14, 2006. 6:36 AM REPLYHow about sending the instructions out with a mylar emergency blanket?(They're cheap ( 1- 2) and lightweight and work perfect for a solar cooker). I likethe idea of pictograph e-Solar-Cooker/

turdomatic says:Jun 30, 2006. 12:38 AM REPLYI heard about some folks using pieces of mirrors glued to their roofs in order to reflect sunlight, thereby infinitesmally helping reverse global warming - so Itried it for cooking too - well, it did take some time but I got a nice hot cup of tea out of it.wrique says:Jan 29, 2006. 1:39 PM REPLYRather than gluing aluminum foil to the reflector, consider using aluminum duct tape. It comes in 2" & 3" widths so you'd have to lay down several strips.I've use this kind of tape for all kinds of stuff, including covering my custom bike frames & other parts to get an inexpensive chrome-like finish aaaay says:Jan 31, 2006. 5:54 AM REPLYThat would work really well and it is the type of ingenuity the builder should incorporate when making this.If you can come up with a generic way to describe applying a reflective surface to something, that can be understood with a simple drawing, so that itdoes not need to be translated into multiple languages (phew) I'd really like to know!Cool trikes! - although the above link is dead (had to go via your blog - an 'l' missing in the url) - it must feel very strange riding a rear steered trike, it'dfeel like over-steer on a normal turn!radiorental says:Jan 18, 2006. 7:14 AM REPLYThe idea could be expaned to two sections, three boards. The outter two board being higher than the center and providing a parabolic along the width aswell as lengthSee other designs here: aaaay says:Jan 19, 2006. 10:36 AM REPLYI'd like to see a sketch of your expansion :-)radiorental says:Jan 27, 2006. 6:38 AM REPLYno problem, I'll knock out some sketches when I get a moment. You should be able to put something like this together in your london flat and test in apark when the sun decides to make an appearance.I'll try to sketch something that is foldable, which seems to be a plus feature on the site above.yaaaay says:Jan 18, 2006. 7:26 AM REPLYYes I have seen the above site and contacted the owner about this design. He like the idea but, quite rightly, replied that he couldn't host this design until ithad been properly tested in the field. As I don't have the resources or sunshine to test this I thought that I could post it here and have a collaboration test andfine tune the idea.The many highly effiecient cookers on the above sight are also quite complex and require special tools to manufacture. This cooker requires the le-Solar-Cooker/

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