When used correctly, this small prop can produce some pretty darn awesome effects. Fueled by nitrocellulose, it can shoot a fireball (that can travel for about 2-3 meters), or something like glitter. Besides being super cool to fire test shots, it can easily be concealed for use in a movie.
This special effects shooter can also be used to create magnificent light paintings, such as those found above.
This is the third and final part of a series of instructables. Go check out the other two parts The Reusable and Wireless Ignitor(part 1), and Nitrocellulose(part 2).
Warning: I'm going to keep this short and sweet:
- This is solely designed for special effects in videos or for photography, not as a toy.
- It doesn't affect skin (even when lit), but the fireball should still not be fired at another human being without proper safety measures [safety glasses, fire-proof clothes (if shooting at clothes), fire extinguisher near by, and someone watching]
Step 1: Materials
|RC car glow plug||(Amazon)|
|AA battery||(Most stores)|
|AA battery holder||(Radioshack)|
|1/4" - 32 Nut||(Mouser)|
|1/2" Copper tube||(Home Depot)|
|1/2" Push nut||(Home Depot)|
|Alligator clip||(Sparkfun, Radioshack)|
|Flash Cotton (nitrocellulose)||(Make it yourself , Aliexpress)|
|2 Velcro cable organizer straps||(Amazon)|
- Stranded wire (~22 AWG at the thinnest)
- Soldering iron
- Sanding drill bit or belt sander
- Metal file
- Rubber wristbands
- Epoxy (optional)
Step 2: Setting Up the Pipe and the Cap
Step 3: Wiring It Up
Overview: This circuit uses the 1.5V DC from the AA battery to make the platinum wire inside the glow plug glow red (or even white!) hot. The glow plug isn't constantly on because of two switches in series: the safety alligator clip must be connected to the tip of the glow plug, and the limit switch must be pressed.
Important note: The glow plug requires so much current that the wires must be pretty thick. This and a dead battery will be important to note when you are trying to find a problem in this project. Even breadboard connections are too thin!
Step 4: Putting It All Together
- Optional: use epoxy to secure everything as shown in the pictures (the epoxy will most likely break, as mine did, but it provides good support)
- Use the two Velcro cable organizers to bundle everything together as shown in the pictures (there are very helpful picture comments)
Step 5: Preparing for Firing
To fire the special effects shooter, you will first need to load it with the propellant (lightly packed nitrocellulose). To do this, use a pencil to push the nitrocellulose all the way down the barrel.
Next, gently roll some nitrocellulose into a small ball (~1cm diameter). This ball will be ignited by the propellant and turn into a fireball. But, this ball can be replaced by anything, such as glitter or small glow-in-the-dark beads for a cool light painting.
Then, cut a 40cm piece of string (or fishing line if you want it to be invisible), and create an adjustable knot (you can use the pictures as a guide).
Finally, secure it to your arm with two rubber bands (or any elastic bracelets).
Step 6: Fire It Up!
- 1st picture: A light painting of me shooting it straight up
- 2nd picture: Yet another light painting
- 3rd picture: A GIF to show how easily it can be concealed
Here is a video of it in use:
A GIF of me doing a kamehameha:
And here I'm am dodging a fireball (example of how it can be used in a movie) (I realize how weird I look XD):
Don't forget to vote if you liked this instructable!