Portable Flame Projector

Warning! working with electricity, gas and flammable liquids is dangerous. I accept no responsibility for others actions using the information on this site.

Introduction

The goal is to build a wearable flame projector that shoots fire at about 2-3 meter from both hands. The system has been revised several times over the years, and the current rendition is a step towards a more steampunk’ish style and hopefully bigger fireballs.

Specifications

Fuel	methylated spirits
Pump	2.5L Windshield washer tank with 2 integrated 12V pumps
Battery	12v motorcycle battery, 3,5aH
Gas	2 600ml propane bottles
Ignition	2 comercial stunguns with 9v battery

 

 

 

 

 

 

 

 Description

The shooters:

The shooters are built into a 50mm PP pipe. In the center there is a piece of tubing from a weed burner. Gas is distributed through a valve from a garden sprayer, which also acts as a handle. The HV output from the stungun is connected to a spark gap in front of the gas nozzle. Fuel is fed into the fire stream with a diffuser from the garden sprayer.

The backpack:

The backpack contains the fuel tank, the pumps and the battery. I have also mounted components from an old car battery booster to display battery charge and to provide input for the charger cable. There is a light bulb from the booster inside the backpack to light up the tank so you can see the liquid level as you pour the fuel.

 

 

Operation:

The operation starts by activating the gas valve on the handle. Gas flows through the tubes and out the nozzle. The gas is mixed with air inside the pipe to obtain a flammable mixture. A switch on the handle activates the stungun and a spark ignites the gas. This gives you a nice pulsating flame because the flame can’t sustain itself without the spark. Now you can activate the last switch that turns the pump on and forces the fuel out the diffuser. Normally I use denatured spirits, because lamp oil/kerosene gives a better flame but also a very unhealthy vapor. i’m not even going to consider using gasoline as the vapor is explosive. Last thing I want is 2.5L of gasoline exploding on my back. Besides spirits gives me a very impressive fireball.