There's another related instructable: LED Floaties by tetranitrate. The floaties didn't get to float up up and away, but made a cool temporary art installation at a park!
Video of the construction and launch:
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Signing UpStep 1: LED Throwie minus magnet
There is also some maths you can do to make sure your balloons are going to fly:
The volume of a sphere:
V = 4/3(pi)r3
And we used 12" latex balloons, so r = 6 inches, which gives ~904 cubic inches or ~15 liters of helium per balloon.
You can approximate for every liter of helium used, you can get about 1 gram of lift, the battery and LED were about 4 grams, the balloon itself was around 3 grams and we can give another gram for the tape and URL paper. The payload for the helium was a total of ~8 grams, which is a ready for launch Houston!









































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Followed by automatic weapons fire.
Hmmmmm....
Super Ultra Bright LEDs, + Optical fiber + sufficient lift = a swarm of Ignignokts shooting the bird to Boston from on high.
(I live in Boston and this is giving me many evil ideas. THNAK YOU!)
thanks!
warren
9 inch balloon has about a 4.5 inch diameter. Volume = ~382 cubic inches = ~6.26 liters of helium
1 liter of helium = about 1 gram of lift, the payload weight is about 8 grams, but that is still about 2 grams too heavy to be lifted by a 9 inch balloon.
But hey, give it a shot, science is experiment.
you live in dallas TX? ;)
+1 and favorited!
To make the float horizontally, and be as visible as possible from the ground, tie a length of thread to each corner and attach them to a small weight, such as a few nuts and bolts.
Choose your image and colours carefully, and you start a UFO scare for real, especially if you use flashing LEDs in the corners.
Heck, just use FLEDs anyway - the battery will last longer (I think).
Kuddos and props!!
*** Note: Every time someone whines about the environment, God kills a kitten... oh hell now I've upset all the non-Christians too :)