Underwater Fireworks Detonator




How to make an electrically detonated fireworks igniter that can be used to detonate waterproof fireworks underwater.

Step 1: Materials

- one christmas tree light (not LED)
- one paper match
- stone/ metalwork file
- hot glue gun
- duct tape
- waterproof firework (obviously)

Step 2: Saw Off the Very Tip of the Christmas Tree Light.

saw off the very end of the christmas tree light with the file, be very gentle as the light will break easily.

Step 3: Insert Match Into Light

cut off the very tip of the match, and put it gently inside the light; making sure it touches, but does not break the filament.

Step 4: Add Firework

insert the fireworks fuse into the light, off to the side of the match. make sure the fuse is in good and tight. remember. the firework/ firecracker has to be waterproof too.

Step 5: Sealing the Light

put a dab of hot glue inside the light, and around the fuse. make sure there are no air holes, or water could get in.

Step 6: Stripping and Sealing the Wires

you will need an ignition source, that provides at least 3 volts. i am using an old model rocket ingniter. strip off the ends of the wires, and put the ignition wires onto it. once the wires are connected, but aa strip of duct tape around them so that they are watertight too.



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    6 Discussions


    4 years ago on Introduction

    I have not tried this before but it will do great for mothers day


    5 years ago

    That's sick, me and my friends blow these off all the time! This is a good idea!


    5 years ago

    It's a lot easy to heat up the tip of the bulb with a lighter then dip only the tip in water. The tip will crack off perfectly almost every time haha I've made these for like 2 years now


    6 years ago

    Nice work. Might I suggest you replace the Gaffa tape with Vulcanising tape instead. Gaffa tape is brilliant and sticks like S:;( to a baby's blanket but it will cop an ingress of water eventually. If you're planning on having both the rocket / firework and ignition source under water for an extended period, I would use Vulcanising tape, then Gaffa, then I would follow it up with Denzo. That is however my opinion and kudos for the effort regardless. Good job and an even greater thought process, so good on ya mate!


    7 years ago on Step 5

    I did this with a normal firecracker and a ballon with tape. I used it in a 5 gallon bucket and it splashed half the water out! It was sick. Good instructable!! :D