Wednesday, December 4, 2013
I also made the fuel and the engine. All is made from the materials you can easily obtain or even have at your house right now.
They can go up to 300 meters (1,000 ft) on this fuel.
Making the fuel involves working with the ammonium nitrate, please before you do it, read this article - http://www.health.ny.gov/environmental/emergency/chemical_terrorism/ammonia_tech.htm
Especially the "What are the immediate health effects of ammonia exposure?" paragraph, so you realize the risks you are taking and I am not responsible for the consequences.
About the material: I used a very soft stretchy material - a cotton spandex mix. Try to use something that has a good three inches of stretch to it. Please measure around your wrist before you cut out the piece. Everyone is different and you may need this to be larger or smaller around your wrist.
When you cut out the main piece, be sure the material is stretchiest along the direction that it will go around your wrist. And, if you can use a material that does not fray, that would save you some trouble in sewing. My cotton-blended spandex material doesn't fray, so I did not need to do any sewing along the edges.
My striped bracelet in the image is a cute vintage style. I cut the material out of an old vintage shirt that was uncomfortable and never worn. It was a little stretchy, but not that stretchy compared to the cotton-spandex material. It also needed the edges sewn in. So, I did a narrow hem along the edges with my narrow-hem presser foot (I also adjusted the tension to make it looser so it was easier to sew). Sewing the edges made this even less stretchy - so be aware of that. It is still super cute. But, I won't be using it as a hairband.
So, I would recommend using a stretchy, non-fraying material. Now, please cut out your pieces.
WARNING: There is a very real risk to health and safety. This project should not be attempted without adult supervision and adequate training. Pyrotechnics are not toys, and should be handled with extreme caution and respect. High temperatures on the stove or oven may cause auto-ignition of the pyrotechnic composition which may lead to serious injury, death, and/or permanent damage to equipment and property. Ignition of an incendiary or explosive material may not be legal in your area, and resulting damage may not be covered by your insurance. Check city laws and ordinances before attempting. Use of this video content is at your own risk.??