Good explanation and sounds true and possible. A perfect solution for Africa too where the sun is so tense. We will save a lot of trees cut for making charcoal and firewood. Come Home Cantina West. Come to Africa - Tanzania.
The pots should have a matt black coating. I have cooked 1/3 oz. burgers on a black granite slab with a non-reflective surface. Just left it out in the sun all morning. It stored plenty of heat. A friend was so impressed with it that he had a picnic table made with a cooking slab square in the center. It won't replace a propane stove for everyday use unless it's in an equatorial desert, but it works very well when conditions are right. Plus it's so cool!
Thanks for the comments , if I get in a jam now I know to use my bar top to cook ! If it doesn't crack maybe a peice of black granite with solar reflectors around the outside underneath might make the perfect cooker.
I used to have a sun chef. It worked quite well, though it didn't capture as much heat as the solar burner. The down side of a lightweight oven is that a very strong gust (100 mph) enough to tear down trees will pick it up and destroy it even if it is held down by 100 lbs of rocks. I am hoping that 200 lb on a solar burner will keep it from flying away and smashing. We don't get hurricanes or tornadoes here, but we do get micro-bursts.
Thank you, dear sir, for the information, but I had known about the idea since 1980, but I did not publish it because at that time we did not have the Internet, social media, or RUclips.
Solar cooking versus charcoal burning: One gust of wind can topple all the solar cookers in this video. The people who are cooking everyday with charcoal do not ask for portable kitchens. They just want heat to cook with. They just want a solid and stable place to cook. Therefore think about shaping the legs of your cookers in such a way that they can fit in cement blocks with standard measurements. The reflectors themselves could be framed in a cement frame after they reach their destinations. Since the sun moves around, the cooker needs to rotate. as well. With two or more replectors per household, they can cook enough food on sunny days for the rainy days. Please let me know if you want me to say more in order to save the trees.
Hot air insulated pipe with a glass capture high temperature glass jar and black stone. Hot air will go up to your cooking pot end pipe hollow connector.
Imagine cooking food , and the hot oil or fat getting sprinkled on the mirror :D :D you must increase the focal point to remove the bowl further from the mirror
Thanks for reviewing side by side. I'd think not being able to easily find focus for the last model is the biggest issue. ...I like that it has the holes, in theory working in a windy location IF focus can be achieved. The gap for rear access on the "Cadillac" is a great idea. It might also allow wind to spill away from the cooker in some situations.
Solar burner is fastest on the test but it has largest diameter 1.5m. Reflector is the cheapest one. Look is totaly not cool but price is. It is very, very coool! 150 usd on sale with free shipping to USA. No body can beat that. Great job!!
You placed a thin pot in the midle of your brand and all the others on the side. Yeah amazing fair review, also how can we tell it is the right angle fo the others, even a 1-2° can make a huge difference
I have the solsource and I need a closeup of the adjuster bar, I'm just not sure how to put it together to make it work. I've had my solsource for over 3 years now, and I lost the instructions.
Its mysterious to me why none of these have equatorial mounts so you could just rotate the dish to follow the sun, or better yet have a motor move it for you.
Sun tracker would be easy to design with a couple of photo cells feeding into an Opamp with feedback circuitry to motor to move either of two directions.
Actually I made it Michael several years back I have not done video and it was left in college they made it damaged I even gave more options, but now I am seeing it's demand And I am in job life If people like you support atleast by watching my video I will start from scratch again I gave suntracking at that time a It's a bit costlier but more costlier is making a reflector itself I mean for me
I guess this kind of stoves so cool but I have a question about their security. What are the risks to user's view over time of use? Another main question is if this parabolic system is more efficient than that others made in thermal box system. That are slower in one dish prepare however they have capacity to prepare more than one at a time and if you forgot it, the food will not burn. For this reason they could be more compacts. Please, what do you think about these questions?
Ummm...to make it a viable experiment, i.e. scientific-method without extraneous variables, you need to use the same type of cook pot on each test too as different materials, and their composition (thickness and metallurgical properties), will vary the heating rate. Also each mirror needs to be properly aimed (maximum focus) and it needs to be done simultaneously at the same time of day.
That's where I went. He should have had 5 pots, to heat at the same time to make up for any clouds passing. He could have found the proper position with a sheet of paper at the focal point very quickly.
Yes, but doing the tests within + or minus one hour from solar noon is probably close enough. Focus and using the same type of pot and water starting at the same temp probably matters more.
Does anyone know any DIY plans on this ? I can't understand how only 1 Circle frame is keeping and holding the parabola shape Help me understand the build pls
Amazing, is the U.S. Army built one at their Natick MA research facility that is still available for use out at White Sands AFB. Was designed to create extremely high temperatures. Uses venetian blinds to shield the dish and a large mirror to focus onto the dish which focuses onto the focal point furnace which is housed in like a room the size of an intermodal shipping container. Might even be one or more of those containers. I totally want to build one to make a power plant and do research regarding metal foundry operations potential capabilities with augmentation via gas or other fuel sources. I think ideally a closed loop generator like an external combustion generator would be the best idea so not to waste water unless potentially desalinating salt water in the process.... where then I think mining operations and possible chemical operations can be had with the saline source system design. Parabolic Troughs have a lot of potential capabilities too I think... though I'm not as confident of metal ore refining or foundry operations unless maybe like some sort of falling design with like a standing vertical trough maybe? Seems even to preheat the material would benefit to reduce fuel consumption and costs.
The shortcoming of them all is that any boil over, frying spatter, or spills fall onto the reflective surface How do you get sun baked on food removed without abrasive cleaners?
Tom, surprisingly the dish does not get that hot, ambient at most but the focal point of the beam will scorch your skin off in a minute, hundreds of degrees in that point, best to build a dish with the pot sitting out front so if it leaks it falls not on the dish. I have built a couple of cookers with a rotisserie base and an adjustment to hold the cooking pot away from the focal point once it starts boiling.
I managed to boil water with mirrors 24 years ago. The color and material of the pot makes a big difference. When where theses last aligned to the pot? I will bet I can teach the designers a thing or two. For example. I heated a larger area using the same space. This is still a hit and miss in its infancy. No one seemed interested 24 years ago.
This is how the Egyptians would grow plants indoors using parabolic mirrors and reflective material inside the room to create a indoor grow light........
Payton did this test when he first came on with the company and was pretty much winging it. He did not have much solar cooking experience and did not have much experience with parabolic cookers. I do my comparison testing differently, but he wanted to make some videos quickly and did not consult with any solar cooking experts while trying to run these comparisons. He tired of this real quickly and gave up in the end.
Could one use a telescope clock to keep the unit perfectly aimed at the sun? What would happen if someone put a Stirling engine at the focal point, and had it drive a generator? Imagine ten thousand of these running in parallel, clocking the sun with optimum collector placement, generating power into a capacitor bank. Seems like a COTS solution, but still has that pesky 10-year reflective quality limitation. One last thought: would have been nice to know the temperature of the water before it was placed in front of the collector.
lots of effort to make this video! great job. But can I give a hint/suggestion? Please buy also 5x Identical pannes for the test! different material quality and thickness can verily the results in time! cheers
@@M70ACARRY you didn't read my comment well I guess! They are comparing aren't they? How can measure thing of your measurement is different on each test?
did he said about temperature - of sun first when he presented , the climate condition temperature is the key factor later all the devices works so much , but i do have doubts how that the heat converted and stored in batteries so that all the three times of a day and night can be cooked for a family c the conversion with 1000 or 2000watts would support 4 to 8 in a family for day to day cooking invention done just to drink or to boil water what is the level of usage for daily family cooking that is the key
boil pezza sauce or spegette sauce in house house hot summer. if boil out side free from sun. that mean grow and make sauce from back yard not anything outside your yard. all need 6 ponds of tomatoes and few other things should make and jar sauce for winter use. allowing you eat off solor oven even winter wont work that well
You made a grammatical error. When you said which cooker boils a liter of water the fastest what you should have said which cooker boils water the quickest.
People saying this is great for Africa to save trees... I don't know what to say on that comment. ....I'm speechless. Please fell free to post ideas for a reply.
you can't go later and later in the day and compare cookers - plus, everyone I know uses black pots or sprays their shiny pots matte black with engine paint.
Three legs, like three wheels, are deficient compared to four. Yes, a tripod is better for a transit, but i would fab four legs under such wind catchers.
having a little wood stove or rocket stove would seem to be easier, and less expensive, yes you need woods, but some of those use very little wood, and in the case of a wood stove you can heat your home as well
Duuude... why the hell does he go from using a black pot in the first demonstration... to using a reflective silver pot in the second demonstration? Mind blowing how little he understands how the device works.... not surprising he isnt wearing eye protection.
I was really looking forward to this comparison, Well you started out Good by giving temperatures of the water on the first two parabola's What Happened? you didn't give water temps after that, (you also did not show the bottom of the pot or a reflection of the bottom of the pot with the focal cone, at the beginning and end of each boil test) then you stopped giving the temps, so your comparison test for me was a Fail, Incomplete info, to bad cause you had the info you just Failed to provide it, just like the Last parabolic you tested.
My CookUp200 will bring 1L water to a full rolling boil, in East Tennessee, in about 15 or 16 minutes during high noon - depending on the wind. The failure was a user failure, not an equipment failure. The other units we misaligned also. I wonder if the Cantina brand would fare the best if it were someone other than Cantina putting the units to test? In other words this "test" could have been done in a more fair and better thought out manner. It was not very objective.
its so expensive to get these its better to use photographer soft boxes to get the job done and its space saver also. this video for his website promotion also what he did was not right if you cut video this does not give me good review.
Good explanation and sounds true and possible. A perfect solution for Africa too where the sun is so tense. We will save a lot of trees cut for making charcoal and firewood. Come Home Cantina West. Come to Africa - Tanzania.
The pots should have a matt black coating. I have cooked 1/3 oz. burgers on a black granite slab with a non-reflective surface. Just left it out in the sun all morning. It stored plenty of heat. A friend was so impressed with it that he had a picnic table made with a cooking slab square in the center. It won't replace a propane stove for everyday use unless it's in an equatorial desert, but it works very well when conditions are right. Plus it's so cool!
Thanks for the comments , if I get in a jam now I know to use my bar top to cook ! If it doesn't crack maybe a peice of black granite with solar reflectors around the outside underneath might make the perfect cooker.
⅓ ounce or ⅓ pound???
Were you making burgers for ants?
I used to have a sun chef. It worked quite well, though it didn't capture as much heat as the solar burner. The down side of a lightweight oven is that a very strong gust (100 mph) enough to tear down trees will pick it up and destroy it even if it is held down by 100 lbs of rocks. I am hoping that 200 lb on a solar burner will keep it from flying away and smashing. We don't get hurricanes or tornadoes here, but we do get micro-bursts.
Put it in a garage when not being used!
Thank you, dear sir, for the information, but I had known about the idea since 1980, but I did not publish it because at that time we did not have the Internet, social media, or RUclips.
It's so neat that they could get Beevis, (or is it Butthead?) to pitch their cookers! I've missed them...
Solar cooking versus charcoal burning: One gust of wind can topple all the solar cookers in this video. The people who are cooking everyday with charcoal do not ask for portable kitchens. They just want heat to cook with. They just want a solid and stable place to cook. Therefore think about shaping the legs of your cookers in such a way that they can fit in
cement blocks with standard measurements. The reflectors themselves could be framed in a cement frame after they reach their destinations. Since the sun moves around, the cooker needs to rotate. as well. With two or more replectors per household, they can cook enough food on sunny days for the rainy days. Please let me know if you want me to say more in order to save the trees.
شكرا سيدي لشرحك للطباخات الشمسية ليستفاد منك المجتمع
Great video! I appreciate that side by side comparison. Hopefully thiis becomes available in the Philippines.
Really awesome. Thanks for making this video. Arduino sun tracker? Maybe pipe oil to a hotplate and cook away from the mirror?
Hot air insulated pipe with a glass capture high temperature glass jar and black stone. Hot air will go up to your cooking pot end pipe hollow connector.
for this to be great comparison they have to be in the same location and same time of day......
Imagine cooking food , and the hot oil or fat getting sprinkled on the mirror :D :D you must increase the focal point to remove the bowl further from the mirror
There are also solar ovens that don't have dangerous focal points and keep enough heat in to cook in a Canadian winter.
Thanks for reviewing side by side. I'd think not being able to easily find focus for the last model is the biggest issue. ...I like that it has the holes, in theory working in a windy location IF focus can be achieved. The gap for rear access on the "Cadillac" is a great idea. It might also allow wind to spill away from the cooker in some situations.
Nice work man you are just man of 21st century man great work keep it up
Thanks!
Solar burner is fastest on the test but it has largest diameter 1.5m. Reflector is the cheapest one. Look is totaly not cool but price is. It is very, very coool! 150 usd on sale with free shipping to USA. No body can beat that. Great job!!
That Mylar tape they use on the solar Burner for reflection has to be replaced every couple of years, and pressed down just before use every time
Use Alanod reflector sheets. They last for 25 years. They even give a guarantee for that.
Goldin Bennet Where can we buy that alanod sheets?
Go to www.alanod-solar.com. You will get worldwide contact addresses.
Thanks!
You placed a thin pot in the midle of your brand and all the others on the side. Yeah amazing fair review, also how can we tell it is the right angle fo the others, even a 1-2° can make a huge difference
I have the solsource and I need a closeup of the adjuster bar, I'm just not sure how to put it together to make it work. I've had my solsource for over 3 years now, and I lost the instructions.
You do know, that all you have to do, is to position some mirrors around the dish to add more light, right?
Its mysterious to me why none of these have equatorial mounts so you could just rotate the dish to follow the sun, or better yet have a motor move it for you.
Sun tracker would be easy to design with a couple of photo cells feeding into an Opamp with feedback circuitry to motor to move either of two directions.
Actually I made it Michael several years back I have not done video and it was left in college they made it damaged
I even gave more options, but now I am seeing it's demand
And I am in job life
If people like you support atleast by watching my video I will start from scratch again
I gave suntracking at that time a
It's a bit costlier but more costlier is making a reflector itself
I mean for me
I guess this kind of stoves so cool but I have a question about their security. What are the risks to user's view over time of use? Another main question is if this parabolic system is more efficient than that others made in thermal box system. That are slower in one dish prepare however they have capacity to prepare more than one at a time and if you forgot it, the food will not burn. For this reason they could be more compacts. Please, what do you think about these questions?
يجب وضع النضارت الشمسية لحماية العينين
"We are gonna just turn this away from the Sun" Thought he was going to burst into Flames. Pointed it at himself.
So NOT give this man a Loaded Gun.
Like that one...?
3:09
😂😂😂
What was the starting temp of water and the ambient temp?
I hope they were the same.
Holy shit you can a thusly see the $1 mylar blanket fold lines in the reflective surface when its turned into the sun at a right angle
Keep a bottle of Aloe Vera gel, or the actual plant, available to soon rub on a burn. Stops the pain surprisingly quickly.
So does emptying a capsule of vitamin E on it!
Ummm...to make it a viable experiment, i.e. scientific-method without extraneous variables, you need to use the same type of cook pot on each test too as different materials, and their composition (thickness and metallurgical properties), will vary the heating rate. Also each mirror needs to be properly aimed (maximum focus) and it needs to be done simultaneously at the same time of day.
That's where I went. He should have had 5 pots, to heat at the same time to make up for any clouds passing. He could have found the proper position with a sheet of paper at the focal point very quickly.
so agree! can you send me the 5 pots so i can make the experiment work right?
Yes, but doing the tests within + or minus one hour from solar noon is probably close enough. Focus and using the same type of pot and water starting at the same temp probably matters more.
Does anyone know any DIY plans on this ? I can't understand how only 1 Circle frame is keeping and holding the parabola shape
Help me understand the build pls
www.solarcooker-at-cantinawest.com/buildingasolarcooker.html
Its 2020 but no government are considering this, though i believe we can't generate electricity if we use the heat for a steam engine
Amazing, is the U.S. Army built one at their Natick MA research facility that is still available for use out at White Sands AFB. Was designed to create extremely high temperatures. Uses venetian blinds to shield the dish and a large mirror to focus onto the dish which focuses onto the focal point furnace which is housed in like a room the size of an intermodal shipping container. Might even be one or more of those containers. I totally want to build one to make a power plant and do research regarding metal foundry operations potential capabilities with augmentation via gas or other fuel sources. I think ideally a closed loop generator like an external combustion generator would be the best idea so not to waste water unless potentially desalinating salt water in the process.... where then I think mining operations and possible chemical operations can be had with the saline source system design. Parabolic Troughs have a lot of potential capabilities too I think... though I'm not as confident of metal ore refining or foundry operations unless maybe like some sort of falling design with like a standing vertical trough maybe? Seems even to preheat the material would benefit to reduce fuel consumption and costs.
I didn’t look at the whole video but I guess the one he promoted was the best
you gotta see the whole one
I like this. Studio life can benifit from this.
May I get training
Hello from Almaty!
conducting a side to side comparison all should be subjected to the same time of exposure same initial temp of water then time simultaneously.
what if you use solar panel with the mirror
The shortcoming of them all is that any boil over, frying spatter, or spills fall onto the reflective surface How do you get sun baked on food removed without abrasive cleaners?
Tom, surprisingly the dish does not get that hot, ambient at most but the focal point of the beam will scorch your skin off in a minute, hundreds of degrees in that point, best to build a dish with the pot sitting out front so if it leaks it falls not on the dish. I have built a couple of cookers with a rotisserie base and an adjustment to hold the cooking pot away from the focal point once it starts boiling.
How much time is required to evaporate 1 litre of water
How do you make a silver mirror?
Hello it's nice idea please if you would not mind I need dimensions and design
www.solarcooker-at-cantinawest.com/buildingasolarcooker.html
Why on earth are there holes in the cookup200 parabolic?
Very well comparison gentleman! you video is very nice.
Lol. Rule number one :
Do not put your hand into the focal point .
I managed to boil water with mirrors 24 years ago. The color and material of the pot makes a big difference. When where theses last aligned to the pot? I will bet I can teach the designers a thing or two. For example. I heated a larger area using the same space. This is still a hit and miss in its infancy. No one seemed interested 24 years ago.
Beautiful!
Can we use this for Boiler at home?!
Which one is best ?
Currently we only sell the CantinaWest solar burner parabolic. It is very efficient and has a lot of power. I would definitely recommend it.
i have couple of the small ones 1v 18 inch
Thanks for the video!
This is how the Egyptians would grow plants indoors using parabolic mirrors and reflective material inside the room to create a indoor grow light........
Mr. Fisher, Is the temperature you stated, Centigrade/Celsius or Fahrenheit?
F
good Lord man, this is America, Celsius is a Socialist conspiracy
I'll stick with my kettle which does the job in 2 minutes!
Payton did this test when he first came on with the company and was pretty much winging it. He did not have much solar cooking experience and did not have much experience with parabolic cookers.
I do my comparison testing differently, but he wanted to make some videos quickly and did not consult with any solar cooking experts while trying to run these comparisons.
He tired of this real quickly and gave up in the end.
Now all they need is gps tracking to track the sun for an all day slow cook
Cái nồi gì vậy? Buy for me, please! Làm thế nào để cái chảo luôn hướng về phía solar?
My mylar covered sattelite dish boiled a cup of water in 3 minutes in the black coffee cup.
Could one use a telescope clock to keep the unit perfectly aimed at the sun? What would happen if someone put a Stirling engine at the focal point, and had it drive a generator? Imagine ten thousand of these running in parallel, clocking the sun with optimum collector placement, generating power into a capacitor bank. Seems like a COTS solution, but still has that pesky 10-year reflective quality limitation. One last thought: would have been nice to know the temperature of the water before it was placed in front of the collector.
" . . . generating power into a capacitor bank . . . "
??? For power as in electricity you need photovoltaic cells, not heat!
lots of effort to make this video! great job. But can I give a hint/suggestion?
Please buy also 5x Identical pannes for the test! different material quality and thickness can verily the results in time!
cheers
This is a solar cooking video, not ham radio
@@M70ACARRY you didn't read my comment well I guess! They are comparing aren't they? How can measure thing of your measurement is different on each test?
did he said about temperature - of sun first when he presented , the climate condition temperature is the key factor later all the devices works so much , but i do have doubts how that the heat converted and stored in batteries so that all the three times of a day and night can be cooked for a family
c the conversion with 1000 or 2000watts would support 4 to 8 in a family for day to day cooking
invention done just to drink or to boil water what is the level of usage for daily family cooking that is the key
Замечательно.
You really couldn't calculate the focal point. That's why it takes so long. Especially the second one
And there is no need for calculations, you can just throw some smoke, and the focal will be revealed
That last pot looked shiny whereas the pot used in the other tests appeared dark colored! What gives?
Do u people sell this things
3:12 mark... packing heat in the waistband. I love it!
Hahahahahahaha right !!! More like " Paranoia Cooker ", LMFAO !!!
boil pezza sauce or spegette sauce in house house hot summer. if boil out side free from sun. that mean grow and make sauce from back yard not anything outside your yard. all need 6 ponds of tomatoes and few other things should make and jar sauce for winter use. allowing you eat off solor oven even winter wont work that well
What's the pistol for?
bravo
Focusing on the sun's rays is like a parabolic dish on the satellitesBut it must all be filled with equal glass pieces of 3×3 squares
Any shiny material works: aluminum, coated mylar, OR silvered mirror. Nothing reflects 100% but it doesn't have to.
I like it sir
You made a grammatical error. When you said which cooker boils a liter of water the fastest what you should have said which cooker boils water the quickest.
The solar vacuum tube cookers are way better, way safer and can fit in a small backpack. Also cheaper at about $100-$200.
Ill do some reviews on them soon :)
People saying this is great for Africa to save trees... I don't know what to say on that comment. ....I'm speechless. Please fell free to post ideas for a reply.
you can't go later and later in the day and compare cookers - plus, everyone I know uses black pots or sprays their shiny pots matte black with engine paint.
Nice job.
Thank you! Cheers!
Nice video
Three legs, like three wheels, are deficient compared to four. Yes, a tripod is better for a transit, but i would fab four legs under such wind catchers.
having a little wood stove or rocket stove would seem to be easier, and less expensive, yes you need woods, but some of those use very little wood, and in the case of a wood stove you can heat your home as well
so agree! great for times when there is no sun!
ძალიან კარგია. ახლა ჩვენ ვიცით რასაც გავაკეთებთ
Duuude... why the hell does he go from using a black pot in the first demonstration... to using a reflective silver pot in the second demonstration?
Mind blowing how little he understands how the device works.... not surprising he isnt wearing eye protection.
He lied.. he said at 6:15 "see you in a minute", and the it took more than 13 mins to appear again.. (or 2 secs in the edited video)
Thanks
Where did he buy the helium?
heven?
uhhhh you got pretty hair it maches ur shirt was that intentional
5:50 that does not look like the focal point of the dish
I was really looking forward to this comparison, Well you started out Good by giving temperatures of the water on the first two parabola's What Happened? you didn't give water temps after that, (you also did not show the bottom of the pot or a reflection of the bottom of the pot with the focal cone, at the beginning and end of each boil test) then you stopped giving the temps, so your comparison test for me was a Fail, Incomplete info, to bad cause you had the info you just Failed to provide it, just like the Last parabolic you tested.
Gary, umm, boiling water is 100 degrees Celsius. So, "rolling boil" means just that temperature.
Sz. Wat... he said the last cooker got to 140 degrees but failed to boil. That means he's quoting temps in Fahrenheit, not Celsius.
I thought a full rolling boil meant 212F. Anything higher than that would be steam.
OMG @ 3:11, is that a GUN ??? LMFAO !!!
Hahahahahahaha right !!! More like " Paranoia Cooker ", LMFAO !!!
Good. I just need a focal point
Sell a heat durable paint that's food safe for none absorbent pans.
Now missing pieces are called innovations .
Top!!!
Not a fair comparison. Far too many variables left unaccounted for.
My CookUp200 will bring 1L water to a full rolling boil, in East Tennessee, in about 15 or 16 minutes during high noon - depending on the wind.
The failure was a user failure, not an equipment failure.
The other units we misaligned also.
I wonder if the Cantina brand would fare the best if it were someone other than Cantina putting the units to test? In other words this "test" could have been done in a more fair and better thought out manner. It was not very objective.
I agree this test seemed very slanted
You sound like a fucking IT nerd
it is from cinamall
But it's very dangerous for the eyes, isn't that? Why don't you say that you must wear very strong eye protection?
Is not simple because you must be to clean this cooker after you cooking food in this cooker
My eyes burns even watching the video 😂
me to!
its so expensive to get these its better to use photographer soft boxes to get the job done and its space saver also. this video for his website promotion also what he did was not right if you cut video this does not give me good review.
sorry :(
GREAD İDEA FOR FREE POWER NOT NEED War for it good planet :)
Thank you good jop
You need sun glasses, not included.
nice video. but no more pelvic thrusting please
u put water very close to glass
Prachtig
Solar burner wins !!
That's a big wok.