Wrist-Mounted Flamethrower Mk. 2: Dual-Stage Liquid Fuel




About: I'm a Mechanical Engineer who has been a part of this community for over 10 years! My interests have evolved over time, and now center around 3D printing.

Truth be told, I've always wanted to shoot fire out of my hands. Because who wouldn't? This is the second wrist-mounted flamethrower I've made to help come one step closer to that dream. If you're interested in my Mk. 1 Wrist-Mounted Flamethrower, feel free to check it out here: https://www.instructables.com/id/Wrist-Mounted-Flamethrower/.

Step 1: Demonstration

I was really happy with the results of my the first tests. Everything worked as it was supposed to, which is a rarity with any project. Enjoy!

Step 2: Explanation Video

In this video, I briefly explain how the entire system works. After watching, head to the next step for pictures and a written explanation.

Step 3: The Build: Stage 1

Palm: The palm portion was made using scrap metal recovered from old appliances, and thin brass tubing that can be found at most hardware or hobby stores. Stainless steel wire was used as the electrodes for the spark ignition. The whole assembly was largely held together using JB Weld.

Wrist: This section was made from steel and aluminum bar stock, cut appropriately, and held together using rivets, threaded rod and nuts. The butane tank is stored here, which was taken from a barbecue lighter. The mechanism was designed specific for my hand/wrist, and so measurements would change from person to person.

Step 4: The Build: Stage 2

An aluminum water bottle was purchased at the local dollar store to be used as our fuel tank. Holes were drilled so that a tire valve could be placed on one end, and a solenoid valve on the other side. The cap is unscrewed, and denatured alcohol is poured in the bottle, then closed and pressurized with an air compressor to about 30psi. The solenoid valve began to fail at around 40psi, and so 30 was about as high as the system could be pressurized to run tests safely.

Step 5: Conclusion

I'm very satisfied with how this project turned out. Somehow by making the flamethrower more dangerous by using liquid fuel, I managed to test it with less burnt hair than my Mk. 1 flamethrower. I've added pictures of the final state of all of the major parts.

Thank you for reading! Also, in case you didn't know, I like comments! : )

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    8 Discussions

    Thank you! If you're going for pyrotechnics, an all-butane flamethrower similar to my first one would be the way to go. This one falls more toward the weapon side of things because of the liquid fuel.

    Some day when I'm not stuck in the midwest, I'll make it out to Burning Man..


    3 years ago

    Hmm.... wrist mounted flame thrower... Seems legit.... wonder why Mk. 1 was a failure....


    3 years ago

    And please make better instructions and a parts list


    3 years ago

    Would this design work without the liquid fuel?

    fozzy13Onyx Ibex

    Reply 5 years ago on Introduction

    Thank you! If you end up making one, make sure to post some pictures or a video here so I can see it!