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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

Part

Supplier

RC car glow plug (Amazon
AA battery (Most stores)
AA battery holder (Radioshack)
Limit switch (Mouser)
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)

Tools:

  • Stranded wire (~22 AWG at the thinnest)
  • Soldering iron
  • Solder
  • Drill
  • Sanding drill bit or belt sander
  • Hacksaw
  • Metal file
  • Rubber wristbands
  • Epoxy (optional)

Step 2: Setting Up the Pipe and the Cap

Cap
  • Drill a 1/4" hole in the cap for the glow plug (it doesn't have to be centered)
  • Secure the glow plug with a 1/4" - 32 nut as shown in the pictures
  • Sand part of the lip off so it can lie flat on your wrist
  • File any sharp edges

Copper Pipe Use a hacksaw to cut about 6cm of the copper piping  (be aware this will make a really loud and high-pitched squealing sound). Then, file the edges down.

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!

The Wiring (everything is also described in the pictures)1. Solder one of the wires from the battery to the middle switch terminal
2. Solder a wire to the normally open terminal of the switch
3. Strip the other end of this wire and feed it through the cap, and secure it with tape if desired
4. Solder a wire to the other side of the battery connector
5. Attach an alligator clip to this wire and wrap it with electrical tape to prevent shorts (this will act as a safety for loading and storage)
6. Cover all solder joints (especially the battery) with epoxy or hot glue to prevent a short and for comfort

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!


Credits:

http://makezine.com/projects/fireball-shooter/: the design demonstrated here contains different parts and isn't meant to be concealed very much, but it is a pretty good project nontheless. (check out my comment below for a full explanation)


<p>Great HIY project. Hadouken-it-yourself. </p>
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<p>I glows preety well</p>
<p>Awesome :) </p>
Thanks! =)
<p>IMADIT</p>
<p>Do you have a picture of it?</p>
<p>cool</p>
<p>Why thank you =)</p>
<p>I'm assuming this is only good for one shot?</p>
<p>Yes, but you can easily upgrade it to a double-barreled one, or if you REALLY want to, a revolving bracelet-like one. Now that I think about it, that sounds <strong>awesome</strong>!</p>
<p>Okay after built, now to find the correct target to create a GREAT laugh!!</p>
<p>omg. I can pull a Ryu! </p>
Go ahead and do it! That would be <strong>amazing!</strong>
<p>The smile of satisfaction on the red guy's face just wants you to make some more of these!</p>
:-D That might one of the best comments ever!
man, this is awesome I will try to make it but i think it isn't easy. but still I will make it, thx
<p>Once you have the parts, it's a pretty quick build. Just double and triple check to make sure the wires are hooked up correctly!</p>
Sorry Nodcah, but how is this different to Kipkay's project from 2012? Watch &quot;Weekend Project: Make a Fireball Shooter (makemag&hellip;&quot; on YouTube Weekend Project: Make a Fireball Shooter (makemag&hellip;: http://youtu.be/NQZeS1mlxAY
<p>Whoops! I forgot to add him as a source. I watched that video while ago and knew there was a way to improve on it, which is why I added a different way of firing it (a limit switch). At <a href="https://www.youtube.com/watch?v=3TvAjGOj-BE#t=178" rel="nofollow">this</a> part in the video you can see he is just holding it. Mine is designed to be concealed under a sleeve or something like that, and I've also sourced different parts with a parts list (something they omit).</p><p>P.S. It wasn't his idea either, he was demonstrating something in Make magazine, which said that it was copying a commercial version. Sorry for the long comment, but I just wanted to show that I'm not directly copying his, or their design.</p>
<p>This is awesome!</p>
Thanks :-)

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Bio: I am a freshman in college studying computer engineering and an alumn of a FIRST robotics team. I also love to tinker on my own ... More »
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