Instructables
Picture of DIY Hot Air Balloons
              Hot air balloons have been around since 1782 and are a well known way of transportation or for just viewing the geographical features of our modern world. Hot air balloons are also the oldest human-carrying flight technology ever. The way these balloons work is that heat is released into the balloon, and due to the fact that heat rises while cold air descends, when the balloon is heated internally, it will lift into the air and gradually rise higher when the passengers heat the inside.

In this instructable, I will be showing you how to make your own mini hot air balloon from just a few, cheap household items.
As you view this instructable, you will not only learn how to build the hot air balloon, but also learn the technology behind hot air balloons. This is a great hands-on learning experience that I use to teach my science class.

 
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Step 1: Materials

Picture of Materials
Materials needed:

1- Large Plastic Bag(I used a bag from the dry cleaners)
3-4 Birthday candles
1-Thick and sturdy wire
1-Aluminum foil
1-Glue gun
1-Lighter

And of course some patience:)

Step 2: Tie The Bag

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First, Tie the bag in four evenly spaced spots by the opening of the bag
(see picture)

Then knot the top of the bag where the hole for the hangers is(only if you have a dry cleaners bag)

Step 3: Cut and Bend Wire

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Cut two pieces of wire that are about the same length as the knots on the bag that are diagonal from each other

Then, twist them together, forming an X shaped structure.

Step 4: Make the Candle Holder

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Take the aluminum, and make a cup shaped structure to hold the candles.

Step 5: Glue the Cup and Add Candles

Picture of Glue the Cup and Add Candles
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Hot glue the cup to the middle of the x shaped structure
Then glue 3-4 candles to the inside of the cup.

Step 6: Attach to Bag

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Carefully twist all 4 parts of the X shaped wire, to all 4 of the knots on the bag.
harfbarf17 days ago

This is very good design it's really cool

Kr. Saurav2 years ago
Can't we make the balloon with paper strips?
It would also reduce the chances of melting.
Also, instead of the candles, you could soak some cotton in alcohol and burn it.
True, you would reduce the chances of melting … but increase the chances of the balloon catching fire in mid-air !!!… :)))

As for alcohol, I guess (but I may be wrong) that the heat produced is not as high as with candles …
yes, i have used tissue paper to make different shapes.
nof-z nof-z2 years ago
also, you can use charcoal
jhawkins141 year ago
What does "be safe" and "you must be cautious when doing this project" mean? What specifically can you do in terms of safety? Wait for a rain... Tie it with a string... Anything else?
1st thing 1st : use your head and good old common sense !!!… ;))

For instance : do NOT do this in a hot summer day when it has not been raining for 6 months and the land, grass, trees are dried up !!!
Do NOT do this in a Mediterranean pine forest !!!
Do NOT do this when there is a slight wind aiming to a gas station !!!
Do NOT do this near a marsh with dried reeds (this one I know 1st hand from when I was a kid in the 50's… and I still remember it …) !!!
Do NOT etc… 

Still there are plenty situations and places where you can do this safely … Great Inst'…
Thanks for posting !…

KD8MSS2 years ago
My Father did this back in 1965. It was a fun evening and we loved the reports of the UFO the next few days.

It was of course after a rain so nothing would catch fire if a balloon landed while the candles were burning.

Please don't do this if you live west of the Rocky Mountains. We are much to dry an environment to launch a flame into the air, where it lands I know not where. How about tethering the bag with a thread? Can somebody recommend a heat source that isn't an open flame?
Use the thinnest black garbage bags ( or thin thin liners), you can find use a stove pipe system for initial lift once up in very bright noon-1 pm sun it should stay up for a while. If you google solar balloons

you will find a number of sites like this one

http://www.solar-balloons.com/

If yu make a "smallish " one you can do an outer clear bag that has been inflated a bit and sealed, when the inner bag is inflated it will act as a double paned window and keeep in energy a tad longer (balloon in a balloon).

some cool foil makers on it will make it "visible" to radar, but I am not sure if this is good or bad.

if you can do it early in the day so you know you will get a long flight.
TheScienceMan (author)  hartmannsclass2 years ago
Good suggestion,but i dont live near the rockies
Velin92 years ago
Not to let you down or anything, but I think you copied this from "sciencetoymaker.com" because they have the exact same thing on their website
TheScienceMan (author)  Velin92 years ago
Its a known idea, i didnt copy
build522 years ago
Yep I tried doing this once but it didn't work out. Good job!!!!
TheScienceMan (author)  build522 years ago
It takes patience. Three of the biggest mistakes i have seen were
A- not enough candles
B-It weighed too much
C-Too big of a bag

Hope you try this again!
yeah I think my mistake was to thin of a bag.
wilgubeast2 years ago
Good academic connection. Also, that looks like a lot of fun.
TheScienceMan (author)  wilgubeast2 years ago
Thank you
AWESOME!! my uncle is a science teacher. deffinatly recomending this to him!!
I myself am a teacher an have used this project to teach my students about cold air and warm air as i teach the weather unit. It is a great hands-on activity for the kids.
rimar20002 years ago
Good work, but warning, doing that I almost fire the house...
TheScienceMan (author)  rimar20002 years ago
Yes, it is indeed a fire hazard and you must be cautious when doing this project.