... explanation is as clear as the bright Sun... great job and thank you for sharing.

Nagyon részletes jól érthető volt.Köszönöm. Megpróbálom megvalósítani és használni

THE BEST VIDEO OF PARABOLIC MIRROR CONSTRUCTION ON THE NET, as far as I have searched, THANKS A LOT, GOD BLESS YOU!!!!!!!

This is the best video. It was so well done and explained. Thank you for making great effort.

Amazing video! Great job filming, editing, and recording this project.

This video is so useful. Thanks for sharing!

Thank you for showing such a practical example!

This is really helpful and great content THANK YOU

I'm horrible at math but i'm interested to make my own parabola. Thank you so much for teaching this in a way that is simple an practical. I love now knowing how I can adjust the focal point. Thanks a lot for this video. Looking at your website too.. very interesting stuff.

I liked your teaching approach!

wow, your video is really helpful,l is exactly the information I was looking for, thank you.

Simple. Thanks. I enjoy quadratic equations but this is very practical.

Thanks for giving working numbers. I shall get back to finding some supplies and much needed material. I suppose both mugs were made of anodized metal with black paint for maximum absorption?

Yup, good one. I'll be back when I'm ready for this stage of my solar project. Materials will increase in quality and ability, but the principles you outlined are exactly what this DIYer needed. Thanks.

Very exact information with simple language.

Brilliant thanks, I’d just ordered some mirror card and wondered how to set up the parabolic frame to hold it in place.

Very nice. Brought back some schoolin' from long ago. Well explained and demonstrated. And kept simple at the same time.

I did the math with different numbers and it worked perfectly. Thank you for the video it was really helpfull to me!!!

Thanks for the illustration, you solve the y-axis point. But still the focal point on the z-axis need to be calculated to set it outside the 3D parabolic receiver!

Best explanation I have seen, having the maths explained makes all this far easier to understand.

Great information 🤜🔔🤛 success there family

Outstandingly good explanation, thousands of "thanks" ! :)

Great video, really well explained. Thank you. I like to make something similar to dry food. The information I got from the video is really valuable. Thank you :)

Definitely best, most useful video on topic.

You are a very good teacher.. I hated school but if I could have a teacher that explain with baby-steps like you did, I would love it. Thx !!

Great. very lucid explanation.

very good and teaching video.appreciated!

A half ellipse containing 1 vertex will focus straight light coming in onto that vertex. A lot of car headlight reflectors are elliptical, check a car parts store or junkyard. When you make a trough reflector, run a pipe along the axis and heat water in that.

Your struts are called gussets. great work sir! you just gained a subscriber.

Great video and very well explained

terrific explanation of the math for plotting the curve and finding the focal point. Thank you. Subscribed

Even I could understand this. :) Needed a good explanation of parabolic math formula.

wonderful awesome job congratulations. Thank You so muchq 👏👏👏 🇦🇷

Excellent !! Very well explained !!

Thankyou so much. I've been lookong for an answer of focus point in concave (from circle) mirror . And this video showed me that focus point only exist in Parabolic.

Thank you for sharing this experiment, hope you'll allow me to use this information to my research.. thanks..

Cool explanation, thanks.

Nice work Sir. U r a good teacher.

Sir! You solved my problem. Although I made a water heater but it's shape was circular. Now I will use this parabolic formula. Thank you for sharing.

Good illumination.

The parabolic trough you made has many (an infinite number !) of focal points along a line, instead you only placed the paper stick touching a small part of that line which you called the focal point. If you place another paper stick at right angles to the existing one at its tip (to form a letter 'T') , you will trace out the focal line with the top of the T.

thank you , merci I loved your demo, simple and clear .

I like this. Makes it easy to understand....

Another easy way to make a parabola-ish (close enough) is to tape the two ends of a piece of string to the piece of paper and hold the paper vertical. The draping string will create a catenary which is virtually identical to a parabola works just as well for this purpose. The tauter the string the shallower then parabola. Then use the string like a stencil and spray paint its shape onto the paper and cut it out. The advantage of this approach is well... no maths. Disadvantage is you'll have to do some experimenting to find an ideal tautness for your desired focal point.

Thanks for giving the method of calculating the focal length .

I am see no. of Video of how to make parabolic solar concentrater but you are the excellent 👌👌 because you explaine very perfect good job sir👍👍👍

Отличное видео, благодарю! Лайк!

Thank you very much!

absolutely brilliant explanation ☺ thank you

Well explained about parabola calculation

Thanks a lot !

Great video and easy to understand.

Good information sir.

exelente comentario muy educativo saludos desde colombia

Thank you! :)

Very helpful video

Very useful for the solar cooking promoters like us.

If you take a reflector such as this one, and point it straight up at the cloudless night sky, will it focus the absorption effect of the black body absorber that is space?

thx a lot you are a good teacher

I have always used the formula "depth = radius^2/(4*fp)", where fp is your desired focal point distance. Radius squared (x dimension squared) divided by 4 times desired focal point distance. Remember to use the same units for x and y Example: fp = 72 r = 30 = 900/288 = 3.125 depth

Thank you very much. Your illustration would be very useful to those who want to design efficient parabolic reflectors for solar cookers. Some are just constructing their parabolic reflectors based on random dimensions.

Great! How about Mylar (from emergency blanket) instead of aluminum foil?

It´s possible to draw parabolas with free CAD or SketchUp too. In Sketchup the Extension is named "curve maker"

Grazie, Fausto (Italia)

Good Video but I am planning to put a servo motor in a single axis direction to track the sun. Hope my project goes well.

Nice :) haha - LEM is a classic Sci-Fi polish author :) Stanisław Lem :)

please iron the aluminum foil with a piece of cotton or wool cloth above it, to make a more smooth mirror.

Good job dear , i would like to know what the equation that help me to know the concentrated resultant heat temperature ?.

Indonesia watching. So good

perfect. its always better when apply mathematics.

ini yg aku cari, penjelasan yg sangat gamblang,

Will you please tell me the focal length of an hyperbolic mirror.

Since it's flat it is not really focusing in a point but a line, still very useful...

Браво

Nice

Thank you so much

Danke, Professor, für die Erklärung, wie man einen Solarkocher baut Damit die ganze Welt davon profitiert

Is it possible to build a telescope with two linear parabolic mirrors? Instead of one "3d" parabolic mirror + one plane mirror...

Soooo god mix of math and physhics for a science experiment with teens...

thanks for the information. no more templates online when making water heaters :D

thanks

This video is so exciting for me xd

👏👏👏👏👏👏👏👏👏

Hey Good Afternoon, As You seems to have knowledge in this kind of Stuff. I am a reaserch person (in medical science) and I want to evaporate water from a circular dish of radius appx 1.5feet. the depth of Dish is appx 10cm. I put that dish with some active material inside it to evaporate the whole mixture. At last i get solidified mass at bottom of that dish. What I am asking is i want to fasten the evaporation of the contains with help of solar energy. Any idea how to do that. I tried this parabola but it's hard to focus the point on ground as dish is heavy and I can't keep it in middle of air hanging. Can we focus this parabola on ground , how so? Is there any other method by which is can increase the evaporation of that dish contains without fuel ?

thankyou

Sir what if We take an A4 size graph paper and takes X co ordinates form -12 to 12 ? Will it have The same focal length of 10 cm ?

Sir can you tell me the materials involved in it? Means the materials you used especially which cup you have used?

interesante🙂👍

Super

How do you enunciate parabola

thank you thank you thank you thank you

interessante engenharia

God the way you pronounced parabola was just about the most ridiculously Australian thing I have ever heard.

meanwhile, just bend a reflective surface and use a thermometer till it’s what you want.

Wow

A much easier method to focus a large area of sunlight to a single point would be to make something on the order of a pie dish with the reflective surface being the slanted edge of the dish. If the dish slant is 45°, parallel light waves incoming will be focused to the center in a circle and eventually to a single point. Soooo much easier to construct. If you are dead set on building a parabolic curve, an easy method is to use a piece of plywood with an x and y axis, the axis running close to the bottom of the sheet. Just drive a nail on the y-axis where you want the focus to be and using a carpenter square, put the corner of the Carpenters square along the x line and the other leg of the square on the nail and draw a line from the corner out. Do this at several places along the x line on each side of the y line and the resulting mishmash of lines very closely approximates a parabolic curve. Now, you can cut that out with a bandsaw and you're on your way.

Im surprised you didnt show easier ways to trace the shape

☀️👍🥂🎩

You can also use 2 nails and a string.

Or you can just use parabolic mirrors and make the effect exponentially better than your aluminum foil and linear approach.