Awesome video Dan. I love how you present your ideas on applied sciences and the results of your experiments from even 6 years ago! I'm always learning something new from you brother!
This video took 40+ hours to produce/edit/voiceover. My higher production quality videos never seem to get many views compared to simple stuff? Oh well, it was a good experience.
The mylar has held up for 4 weeks so far with a vacuum. And when the vacuum is removed, the reflective surface is flat and near distortion free so it seems to hold up without expanding. The mylar can accept tight stretching when making. This prevents sagging.
Thanks Dan, I live in the Philippines and this is going to be a big help in helping those in the villages to cook. I am home (USA) for the holidays. I just want to make sure I get the right blanket.
Love your Experiments ! Started watching years ago. 🔥 I have to make a solar water distiller to make drinkable water and also to cook with. This is the way 😎
Thank you for the nice comment. I thought this video would have been a bigger hit. Almost 9 months and total video views = what someone burning a cell phone gets in 2 days. Our videos are getting buried in search results for some reason. 94% of the views were driven by our website, or FB page and our RUclips homepage. Only 1,800 views from YT.
Okay - one trick you missed (besides using decent plywood for a back) is once you have it stretched, to go ahead and do a pass with a hair drier. I THINK this will remove the last vestiges of creases - unless the blanket was heat-pressed, which I don't know why it would be. Mylar is apparently a good memory material and returns to its original shape with just a bit of heat. The sun won't heat that mylar up, but hot air will.
I like this concept ,it is the method that I have been looking for..Back in 1992 I polished an 8 ft diameter Cband satellite receiver dish to be used as a solar collector .The polishing of this dish took a long time and the reflectivity was only around 75% at the best .It did set lumber on fire.
Yes, then a thin spray of enamel paint to preserve it. The two I made are sitting outside in FL weather, while the humidity is lower than summers, they are both holding up well.
Very nice work, this can also be used with an old font (cast iron) radiators, mounted in a frame and a clear plastic cover to protect the radiator from the cold air. filled with water and connected to a storage tank of 200lt - 400lt. by fitting a pressure release valve and a central heating pump the water in the tank can be heated to 40-50 deg during the day. this tank can be placed in line with the other tank electrically heated to supply your bath or shower etc. by placing the new tank vertically and feeding in cold water at the bottom and taking the hottest water from the top, to feed your electrically heated water tank.. your ability to supply hot water is now doubled as you will be feeding the normal tank with hot water or well warm water rather than cold water direct in from underground.. result is you can take longer showers, fill a bath tub and still have gallons of hot water left.. the amount of electricity required every day to reheat the tank will decrease. and you save a fortune....
The first surface mylar will oxidize if placed on the outside years of exposure. Place the conductive first surface side, inside and mist with enamel paint. This seals the aluminum exposed surface and it will last years without turning golden yellow. The mylar is inexpensive so the front can be re-stretched every year or so with extreme usage. I have mylar flat mirrors that have sat in the rain and Florida humidity for years and they are still good.
I will have a video on a round mirror. I just made one in 15 minutes:-) It is like a drum and a near perfect parabola/spherical shape. The mirror flat is distortion free, vacuum it casts really good images on the wall. May be a first surface telescope option too. Will test with the moon tonight if the clouds go away! With a little trick, the wrinkles go away.
Hi Julie, im unsure about the electrical part myself, but the shut off valve / vacuum 's function is to change the focal length, ie: focus/ concentrate the light, so yes to use this to cook, you'd want to focus the suns light on the pot / pan, you will need to do the vacuum / shut off valve bit. The electrical part probably just makes the surface a bit more reflective, but maybe not 100% necessary
for the small scale competition, I don't think the boys won fair and square. They can't use some technology that was not available to Archimedes. For the large scale, they accomplished the death ray but at 75 feet, it couldn't be that effective in a battle since the archers could easily target the mirrors from that distance. Nonetheless, Archimedes had the resources, manpower and money of a King defending his country so whatever apparatus he had must have been on a very large scale.
All mirrors are 2 way mirrors. All glass mirrors when coated have a first surface side but grey paint is added to cover the aluminum for protection in household mirrors. Get a good mylar blanket and stretch it flat. The side with the most light will be a mirror, the darker side = cloaked 2 way view. You need a brighter side like cop movies. Detectives in a dark room, interrogation is a well illuminated room. Either side will work, the light makes the difference. Swap the light swap the effect.
Your videos are great. I like that you put numbers to your projects and for this one show the square version has practicle precision. If I were to do one I think a 6 or 8 sided one would be almost as easy to build. Probably round over the inside edges with a router. For me practicle solar reflector applucation will be soil / mulch sterilizer of 55 gallon steel drum with aluminum foil over scavanged coroplast reflector. Don't know if Anyone has done this or not, seems obvious. Another low cost / low fabrication / universal parts availability solar cocentrator design uses a 4'x4' piece of masonite cut in a spiral with aluminum foil glued to it attached to 1x2 crosspieces cut to angle the around 2" wide spiral into a fresnel reflector. Use search term - steenblik spiral fresnel - redrok is an interesting hit. I think wind will be less of a problem with this design than solid designs.
I have been looking, looking, looking for cheap reasonable solution for a green energy stainless steal boil tank. THANK YOU SO MUCH FOR ALL YOUR HARD WORK!!!
as soon as i get paid, im going to the hardware shop, i just made one of these stretching it over a medium bowl, managed a slight parabola by putting it in the freezer for a few mins and then was able to light a leaf with heavy cloud cover, i want to make one i can pull a propper vac on now
If you look into re felting a pool table from a company called Game Cloth they have an instruction form on attaching the cloth at given points to give it consistent grain and be equally tight in all areas.
Still amazing. Dan you ready for my idea? Tires car truck who cares they're free racing tires are the lightest , bind them together bailing wire. You want to make a long tube out of the tires.cap the ends with sheet glass. Those tanks refrigeration companies can't find a way to dispose of should work as a inner tube cut the top and bottom off join them with epoxy , welding would work but very expensive. Or how about pex tubing filled with glycol , a little pump to flow in the floors? Or maybe a bed ? Large sheets of stryofoam $12 sheet covered in mylar , 2 mil 100'X 48" ~$31. If you want cut the beads on the inner side of the tires once wire holds tires together run a bead in the gap , spray foam silicone maybe inflate a bicycle inner tube. Using the collector and the tire a good temperature should be had reducing dependence on other fuel sources. Would make a hell of a french bread oven ? Drill hole in tire for pex tubing to be directed , cut the beads running the tube should be easier once pex tubing is in stuff core with styrofoam chunks , news paper , or make a oven out of the space. Horizontal, vertical your option.
Something I've been wondering about for a while now is whether this would work with reflective plastic packaging from things like potato chips. If so, it would be a great way to repurpose it since supposedly it can't be recycled.
Note: Silicon is a waxy rubber gasket that never completely seals to any surface. I recommend using polyurethane if you want a permanent aittight seal.
Mythbusters say the story of archemedes burning a roman fleet is a myth... that was using 1 small mirror, archemedes likely built the antikythera mechanism and could easily have got multiple mirrors to focus on ships even if 1 didnt do the job.
Hello Dan, I love your videos, they're very informative. Have you ever tried this using a round form for your vacuum frame? It may not be worth the effort, but it seems like you could get a very precise focus. Since you use coroplast material, you could build the whole thing out of it. Using a few thicknesses to beef up on the sidewall , would increase the thickness of the side wall, making it strong. Just a thought. Thanks for the great video.
I would like to create a parabolic mirror based swimming pool heater to extend the swimming season.This is for a pool in US mid Atlantic region where sunlight is fairly abundant in the early summer and fall, but because the temp drops at night the water stays cold. I'm thinking of something that focuses the light on a set of black pipes. There would be no pump, I'm thinking the water could get very hot and cause flow thru the pipes.
Use two sealed flexible sides, one reflective and the other works as a diaphragm. If they are close together, pulling the diaphragm away will cause a semi vacuum and the reflective to flex into a parabola, all it needs is a relief valve if it leaks air into the vacuum and it looses shape, No need for any vacuum machines or pipes. Under $25 remember! I love your stuff but youre starting to get more materials and equipment that most who need these ideas can afford.
Hello Mr. & Mrs. Rojas, Thank you for all the cool stuff you have put on your tube throughout the years. ( some very cool stuff ) :-) .. Anyway I see your using a mylar style space blanket. I am very interested in that. can you send me some more info on that please? thank you for your time. And keep up the good work! SF
Get the steam engine off of one of those mini steam engine trains that are a coupe feet tall. Use the Sun to make steam to turn a decent sized generator. Love your work Dan. But we need to see something practical that generates a few hundred watts of power or more.
Your generosity in sharing is unparalleled. You're the king of highbrow lowtech!! Thanks yet again!!!
Awesome video Dan. I love how you present your ideas on applied sciences and the results of your experiments from even 6 years ago! I'm always learning something new from you brother!
Whaa
F
King of Random,salute,RIP.
F
8 years ago
Metric System please.
Learn imperial sir
No@@hughjanus7131
convert it yourself
Yes
⠀
Si units rise up
This video took 40+ hours to produce/edit/voiceover. My higher production quality videos never seem to get many views compared to simple stuff? Oh well, it was a good experience.
GREENPOWERSCIENCE: it is a great experience on my end, too.
Hi GreenPowerScience, how can i get something to burn at 10,800 degrees F? Thanks!
I think I love you.
@@HOLLYHOUSE11 HE ALREADY HAS A WOMAN. SO BACK OFF WITH THE 'LOVE YOU' STUFF.....
@@johnconrad5487 sounds like Maybe you need a nap.... And some Jesus or something... Or a cocktail... Relax.
you are such a great asset to anyone learning in the fields you cover. Thank you and keep up the awesome work😊
The mylar has held up for 4 weeks so far with a vacuum. And when the vacuum is removed, the reflective surface is flat and near distortion free so it seems to hold up without expanding. The mylar can accept tight stretching when making. This prevents sagging.
It's always fun until someone gets hurt, then it's hilarious! I absolutely love Denise reaction at 08.15
8:15
Thanks Dan, I live in the Philippines and this is going to be a big help in helping those in the villages to cook. I am home (USA) for the holidays. I just want to make sure I get the right blanket.
Love your Experiments ! Started watching years ago. 🔥 I have to make a solar water distiller to make drinkable water and also to cook with. This is the way 😎
P
Thank you for the nice comment. I thought this video would have been a bigger hit. Almost 9 months and total video views = what someone burning a cell phone gets in 2 days. Our videos are getting buried in search results for some reason. 94% of the views were driven by our website, or FB page and our RUclips homepage. Only 1,800 views from YT.
Okay - one trick you missed (besides using decent plywood for a back) is once you have it stretched, to go ahead and do a pass with a hair drier. I THINK this will remove the last vestiges of creases - unless the blanket was heat-pressed, which I don't know why it would be. Mylar is apparently a good memory material and returns to its original shape with just a bit of heat. The sun won't heat that mylar up, but hot air will.
Your paintings were fantastic! I had no idea you both were so talented!
I like this concept ,it is the method that I have been looking for..Back in 1992 I polished an 8 ft diameter Cband satellite receiver dish to be used as a solar collector .The polishing of this dish took a long time and the reflectivity was only around 75% at the best .It did set lumber on fire.
Dan, you my favorite backyard genius... still 👊
Thank you Cyber MacGyver. 👊
I second
I third
I was so totally expecting Dan to make all of Denise's 2 foot long hair stand on end with the charged mylar!
Very knowledgeable and obviously sincere dedication to the art and science of the craft!! generous sharing of hard earned expertise. Thank you.
Yes, then a thin spray of enamel paint to preserve it. The two I made are sitting outside in FL weather, while the humidity is lower than summers, they are both holding up well.
Very nice work, this can also be used with an old font (cast iron) radiators, mounted in a frame and a clear plastic cover to protect the radiator from the cold air. filled with water and connected to a storage tank of 200lt - 400lt. by fitting a pressure release valve and a central heating pump the water in the tank can be heated to 40-50 deg during the day. this tank can be placed in line with the other tank electrically heated to supply your bath or shower etc. by placing the new tank vertically and feeding in cold water at the bottom and taking the hottest water from the top, to feed your electrically heated water tank.. your ability to supply hot water is now doubled as you will be feeding the normal tank with hot water or well warm water rather than cold water direct in from underground.. result is you can take longer showers, fill a bath tub and still have gallons of hot water left.. the amount of electricity required every day to reheat the tank will decrease. and you save a fortune....
Money cannot be saved, but nature and electricity can
The first surface mylar will oxidize if placed on the outside years of exposure. Place the conductive first surface side, inside and mist with enamel paint. This seals the aluminum exposed surface and it will last years without turning golden yellow. The mylar is inexpensive so the front can be re-stretched every year or so with extreme usage. I have mylar flat mirrors that have sat in the rain and Florida humidity for years and they are still good.
I will have a video on a round mirror. I just made one in 15 minutes:-) It is like a drum and a near perfect parabola/spherical shape. The mirror flat is distortion free, vacuum it casts really good images on the wall. May be a first surface telescope option too. Will test with the moon tonight if the clouds go away!
With a little trick, the wrinkles go away.
Tesla's great grandson. :D
Hi Julie,
im unsure about the electrical part myself, but the shut off valve / vacuum 's function is to change the focal length, ie: focus/ concentrate the light, so yes to use this to cook, you'd want to focus the suns light on the pot / pan, you will need to do the vacuum / shut off valve bit.
The electrical part probably just makes the surface a bit more reflective, but maybe not 100% necessary
for the small scale competition, I don't think the boys won fair and square. They can't use some technology that was not available to Archimedes. For the large scale, they accomplished the death ray but at 75 feet, it couldn't be that effective in a battle since the archers could easily target the mirrors from that distance. Nonetheless, Archimedes had the resources, manpower and money of a King defending his country so whatever apparatus he had must have been on a very large scale.
Haha, love the reaction of wife, doesn't get mad but will probably get even soon! That is the spirit.
It would have been even funnier if Her hair stood up and got all fuzzy .
I can only imagine this guy feels like a kid at the playground. I'm going to start getting into it too
Archimedes would be proud
Les has a good TV show, the water bottle trick and clear plastic water lens would be a perfect fit. Happy Holidays!
thanks for transfering this great knowledge i love physic power
All mirrors are 2 way mirrors. All glass mirrors when coated have a first surface side but grey paint is added to cover the aluminum for protection in household mirrors. Get a good mylar blanket and stretch it flat. The side with the most light will be a mirror, the darker side = cloaked 2 way view. You need a brighter side like cop movies. Detectives in a dark room, interrogation is a well illuminated room. Either side will work, the light makes the difference. Swap the light swap the effect.
Gonna try that stretched mylar mirror in my aquaculture 3 in 1 root electrified hydroponic enclosure. Thanks man！
A BIG THANK 😊 🙏
I live in guatemala this will be a LOT of help
Consider the shape of the square lens vs the round. There is little parabolic shape on the square.
Another Fantastic production! Thank you for this and all your videos.
Your videos are great. I like that you put numbers to your projects and for this one show the square version has practicle precision. If I were to do one I think a 6 or 8 sided one would be almost as easy to build. Probably round over the inside edges with a router.
For me practicle solar reflector applucation will be soil / mulch sterilizer of 55 gallon steel drum with aluminum foil over scavanged coroplast reflector. Don't know if Anyone has done this or not, seems obvious.
Another low cost / low fabrication / universal parts availability solar cocentrator design uses a 4'x4' piece of masonite cut in a spiral with aluminum foil glued to it attached to 1x2 crosspieces cut to angle the around 2" wide spiral into a fresnel reflector. Use search term - steenblik spiral fresnel - redrok is an interesting hit. I think wind will be less of a problem with this design than solid designs.
The Rojas reflector should be mass produced and distributed . Fire and fuel was the catalyst of our evolution. Amazing times .
It’s funny how history omits talking about these things as if no one used them as lasers from ships or lighthouses as defense towers
Most fun couple on the planet, i am convinced.
Wow! You've explained it so well!
I have been looking, looking, looking for cheap reasonable solution for a green energy stainless steal boil tank. THANK YOU SO MUCH FOR ALL YOUR HARD WORK!!!
Excellent detailed instructions. Thank you very much.
flexible glass with a mirror finish similar to what corning has developed would be an ideal material to experiment with
Thanks for all your inventions and projects Dan !
I really enjoy your channel
.....good stuff
Much more honest and down to earth than Myth B.....s :)
Excellent project thanks
Pensar que esas cocina solar las anunciaban en la revista Mecánica Popular hace más de 40 años
It is interesting. Excellent method! Thanks
Please focus the beam with a secondary magnifying lens, that's the part Archimedes neglected to mention
as soon as i get paid, im going to the hardware shop, i just made one of these stretching it over a medium bowl, managed a slight parabola by putting it in the freezer for a few mins and then was able to light a leaf with heavy cloud cover, i want to make one i can pull a propper vac on now
Myth busters need to watch this........they will have to do one of their shows
Thanks, Dan!
back in 1978 when on holiday in the states i bought a pocket sized parabolic mirror, about 3 inch, it was a cigarette lighter.
48 inches...very thoughtful of giving measurement in inches for the rest of the world..
"Honey, i destroyed the car tyres, we'll have to stay in bed today"
What an AMAZING channel!
What about doing a cone copper coil that tightens with the beam. Increased surface area might increase output
cool looks like it works great! Ill give her a shot and see what happens.Thanks :)
raise it up higher.. nice job.
Best reflector solarpanel. U can easily take seawater and boil it to make driving water in pipe
Uhhh, that was a Tim Russert painting. That's the coolest thing I've ever seen. I would buy that.
If you look into re felting a pool table from a company called Game Cloth they have an instruction form on attaching the cloth at given points to give it consistent grain and be equally tight in all areas.
Still amazing. Dan you ready for my idea? Tires car truck who cares they're free racing tires are the lightest , bind them together bailing wire. You want to make a long tube out of the tires.cap the ends with sheet glass. Those tanks refrigeration companies can't find a way to dispose of should work as a inner tube cut the top and bottom off join them with epoxy , welding would work but very expensive. Or how about pex tubing filled with glycol , a little pump to flow in the floors? Or maybe a bed ? Large sheets of stryofoam $12 sheet covered in mylar , 2 mil 100'X 48" ~$31.
If you want cut the beads on the inner side of the tires once wire holds tires together run a bead in the gap , spray foam silicone maybe inflate a bicycle inner tube. Using the collector and the tire a good temperature should be had reducing dependence on other fuel sources. Would make a hell of a french bread oven ?
Drill hole in tire for pex tubing to be directed , cut the beads running the tube should be easier once pex tubing is in stuff core with styrofoam chunks , news paper , or make a oven out of the space. Horizontal, vertical your option.
:-) Almost everyone wants to learn how to build stuff in 30 seconds or less. Tricky task.
This type of reflector- a parabolic mirror made from stretched, vacuumed mylar is called a Rojas Mirror, named for its inventor Dan Rojas.
😅😄 Congratulations Dan 👍👍👏👏
It's blinding through the video, bro!😎
Something I've been wondering about for a while now is whether this would work with reflective plastic packaging from things like potato chips. If so, it would be a great way to repurpose it since supposedly it can't be recycled.
That is mylar, it works! 👍
@@0penEyesAndMind51 Oh, thanks!
New subscriber from Somalia
Noted, and added to the title:-) THANK YOU!!!
Real free energy!
How
You two are amazing.
Great video thank you so we're good till for squishing bottles and glass
Awesome I love Archimedes
Feet and inches is good. Especially for those of us in Great Britain 🇬🇧
Good cheep free energy concentration! Brilliant!
Talk to me I'm confused about this
Nice video , congrats
i'd love to see a granite wall experiment to mimic peruvian megalithic assembly
It's the spread of distorted rays from sun reflection that is interesting.
Excellent work Dan
It is less than 1 mil. Thicker mylar works but does not stretch well. Look for mylar blankets. They are cheap and thin.
Note: Silicon is a waxy rubber gasket that never completely seals to any surface. I recommend using polyurethane if you want a permanent aittight seal.
Mylar is also used to make AC capacitors
maybe you could get this rohas invention on tv news too, would be a great follow up
Mythbusters say the story of archemedes burning a roman fleet is a myth... that was using 1 small mirror, archemedes likely built the antikythera mechanism and could easily have got multiple mirrors to focus on ships even if 1 didnt do the job.
Hello Dan,
I love your videos, they're very informative. Have you ever tried this using a round form for your vacuum frame? It may not be worth the effort, but it seems like you could get a very precise focus. Since you use coroplast material, you could build the whole thing out of it. Using a few thicknesses to beef up on the sidewall , would increase the thickness of the side wall, making it strong. Just a thought. Thanks for the great video.
Thanks, I needed it for an artsy teacher friend.
I would like to create a parabolic mirror based swimming pool heater to extend the swimming season.This is for a pool in US mid Atlantic region where sunlight is fairly abundant in the early summer and fall, but because the temp drops at night the water stays cold. I'm thinking of something that focuses the light on a set of black pipes. There would be no pump, I'm thinking the water could get very hot and cause flow thru the pipes.
Amazing, it is can be boiling any water in a bottle.
In a SHTF situation, this would be a great defensive weapon
Use two sealed flexible sides, one reflective and the other works as a diaphragm. If they are close together, pulling the diaphragm away will cause a semi vacuum and the reflective to flex into a parabola, all it needs is a relief valve if it leaks air into the vacuum and it looses shape, No need for any vacuum machines or pipes.
Under $25 remember! I love your stuff but youre starting to get more materials and equipment that most who need these ideas can afford.
I’m curious if you have footage of the Mylar with electrical current running through it in the dark? Might be a fun short video :)
I could definitely see some of these ideas being adopted in developing or third world countries. Reliance on fire wood is an issue in a lot of places.
Hello Mr. & Mrs. Rojas, Thank you for all the cool stuff you have put on your tube throughout the years. ( some very cool stuff ) :-) .. Anyway I see your using a mylar style space blanket. I am very interested in that. can you send me some more info on that please? thank you for your time. And keep up the good work! SF
lmao. "You can make your own seizure ray".... had me laughing. Good stuff!
You should make an Astrograph from these! Have you tried? Would that work?
Thank you Mike.
thanks
This would be an awesome tool to scare away the zombies once the grid goes down.
Great work।
"for those of you with a short attention span", he got me.
Get the steam engine off of one of those mini steam engine trains that are a coupe feet tall. Use the Sun to make steam to turn a decent sized generator.
Love your work Dan. But we need to see something practical that generates a few hundred watts of power or more.
Greetings, I bought one of your lenses, arrived safely- but have not worked out how to use it to make a fire, can you provide some explanation please?