
Flamethrowers are devices that can shoot flames over 10 feet and are defined and restricted by the California Health and Safety Code. The amount of fuel in a flamethrower varies depending on the model and its intended use. For example, the M1 flamethrower was replaced by the M1A1 in 1943, which had a backpack configuration with two fuel tanks and one propellant tank. The M1A1 could fire up to 50 yards away, a significant improvement over the M1's 20-yard range. Modern flamethrowers, such as the XL18, have refillable and exchangeable CO2 tank arrangements, allowing for swift refueling and uninterrupted use. The fuel capacity of a flamethrower is typically around 3.5 US gallons or 13.25 liters, providing a continuous 60-second burn.
| Characteristics | Values |
|---|---|
| Fuel capacity | 3.5 US gallons/13.25 liters |
| Burn duration | 60 seconds |
| Fuel type | Gasoline, oil, diesel, napalm, etc. |
| Fuel system | Two tanks, one for fuel and one for CO2 |
| Pressure | 2200 psi |
| Operating pressure | 800 psi |
| Range | 10-45 feet |
| CO2 function | Propels fuel and pressurizes tank |
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What You'll Learn
- Flamethrowers use a variety of fuels, including gasoline, oil, diesel, and napalm
- CO2 is used to pressurise the fuel tank and propel the fuel
- Flamethrowers can be dangerous, with the potential for explosion or internal fire
- In the US, flamethrowers are federally unregulated but are subject to state and local laws
- The M1 flamethrower was used during World War II and had a maximum range of 20 yards

Flamethrowers use a variety of fuels, including gasoline, oil, diesel, and napalm
Gasoline is a common choice of fuel for flamethrowers. It is highly flammable and can be easily ignited with a spark. The vapours of gasoline are what ignite, rather than the liquid itself. A specific ratio of oxygen to gasoline is required for ignition—a 14:1 air to fuel mixture. Gasoline is also a component of napalm, an incendiary mixture of a gelling agent and a volatile petrochemical.
Diesel is another fuel option for flamethrowers. It is often used in a mixture with gasoline, with a ratio of up to 50% diesel. Diesel has the ability to slow the burn of the flame while increasing its temperature. It is oilier and clings to surfaces better, making it ideal for burning foliage.
Napalm is a particularly effective and controversial fuel due to its longer burn time, ease of dispersal, and ability to adhere to targets. It was widely used during World War II, the Korean War, and the Vietnam War. Napalm burns at extremely high temperatures, ranging from 800 to 1,200 °C.
It is important to note that the safety of using a flamethrower depends on the user's responsibility and awareness. CO2 is often used to pressurize flamethrowers and prevent explosions, as it is an inert gas that eliminates the chance of internal fires.
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CO2 is used to pressurise the fuel tank and propel the fuel
CO2 is also used because it is inert and eliminates the risk of explosion or internal fire. Fire cannot exist in the presence of CO2 as it requires oxygen to burn. As the fuel tank empties, it is filled with CO2, preventing the possibility of a spark or flame igniting the remaining fuel.
Flamethrowers typically use gasoline, diesel, or a mixture of the two as fuel. Virtually any flammable liquid can be used, including used motor oil, which is thick, burns for a long time, and is free. For longer ranges, heavier fuels like oil or diesel are recommended.
The fuel capacity of a flamethrower is typically around 3.5 US gallons (13.25 litres), which will last for a continuous 60-second burn. Most flamethrower displays last about 5-10 minutes, as they are not usually in use for a full 60 seconds.
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Flamethrowers can be dangerous, with the potential for explosion or internal fire
Flamethrowers are ranged incendiary devices designed to project a controllable jet of fire. They were first deployed by the Byzantine Empire in the 7th century AD and have been used in modern times during World War I and World War II as tactical weapons against fortifications. Flamethrowers pose several risks and dangers to their operators due to their potential for explosion or internal fire.
Flamethrowers use a smaller tank with pressurised gas to expel flammable liquid fuel. The pressurizer is filled with a non-flammable gas, such as nitrogen or carbon dioxide (CO2), that is under high pressure. CO2 is an inert gas that eliminates the chance of explosion or internal fire as fire cannot exist in its presence. However, if the tank ruptures, it might knock the operator forward as it bursts outward when punctured.
The risk of a flamethrower operator being caught in the explosion of their weapon due to enemy hits on the tanks is a concern. In some cases, pressure tanks have exploded and killed operators when hit by bullets or grenade shrapnel. The fuel mixture in the containers is difficult to light, but if ignited, it can result in an explosion.
Flamethrowers also impair the soldier's mobility due to their weight and length. The effective range of a flamethrower is shorter compared to other battlefield weapons of similar size, requiring soldiers to approach their targets and risk exposure to enemy fire.
It is important to note that the safety of a flamethrower depends on how it is used. Proper safety precautions, such as storing the device depressurized and with the fuel tank empty, can help mitigate some of the risks associated with flamethrowers.
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In the US, flamethrowers are federally unregulated but are subject to state and local laws
Flamethrowers in the US are not subject to federal laws as they are not defined as weapons under the National Firearms Act. However, their possession and use are subject to varying state and local laws. While some states permit unrestricted ownership, others impose certain restrictions or outright bans.
California, for instance, requires a permit for flamethrower possession. The state bans "any non-stationary and transportable device designed or intended to emit or propel a burning stream of combustible or flammable liquid to a distance of at least 10 feet" without a permit from a fire marshal. California users must ensure compliance with the California Health and Safety Codes before modifying their devices.
In Maryland, flamethrowers are defined as "`destructive devices'" and are banned entirely. Possession or use of a flamethrower in the state can result in a $250,000 fine and/or up to 25 years in prison.
Some municipalities have also attempted to enact bans or restrictions. For example, the city council of Warren, Michigan, considered a ban on flamethrowers in 2015. New York State Senator John Brooks introduced a bill in 2019 to criminalize the recreational use of flamethrowers while permitting their use for specific purposes.
The fuel capacity of a flamethrower is typically around 3.5 US gallons or 13.25 liters, which is sufficient for a continuous 60-second burn. It's important to note that the regulations regarding flamethrowers can vary from state to state, and individuals interested in owning or using flamethrowers should familiarize themselves with their respective state and local laws to ensure compliance and safe use.
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The M1 flamethrower was used during World War II and had a maximum range of 20 yards
The M1 flamethrower was a portable infantry flamethrower used during World War II, with a maximum range of 20 yards. It was developed in response to the need for a flamethrower capability to counter the efficacy of the blitzkrieg. The Chemical Warfare Service worked on the design, and the first experimental model, E1, was manufactured by the Kincaid Company of New York. The M1 was then developed from test board suggestions, resulting in a heavier but more rugged flamethrower system. It was manufactured in March 1942 and deployed by the end of the year to the South Pacific theatre.
The M1 flamethrower used a mixture of gasoline and oil, which sprayed as it left the barrel of the flame gun. The fuel capacity of the M1 flamethrower is estimated to be around 3.5 US gallons or 13.25 litres, providing a continuous 60-second burn. This is a significant amount of fuel that can be used to spray an area in a similar way to how a hose sprays water onto a garden bed. The M1 flamethrower was also capable of firing from a prone position, an improvement on earlier models.
The M1 flamethrower played an important role in the Pacific Theatre, where it was highly effective in engaging dug-in Japanese defenders in foxholes, tunnels, and bunkers. The psychological impact of the "liquid flame" was also significant, sometimes leading to enemy soldiers surrendering upon seeing the flamethrower. However, the M1 had limitations in terms of range, inherent danger, and portability. The operator often had to expose most of their body when engaging enemy positions, putting themselves in harm's way.
The M1 flamethrower was gradually replaced by the improved M1A1 model in 1943, which offered a greater range of up to 50 yards. The M1A1 used napalm, a thicker fuel that increased the flamethrower's range and damage. The M1A1 also had a reduced operational weight, making it more manageable for infantry platoons. Despite its improvements, the M1A1 still relied on the same ignition system as the M1.
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Frequently asked questions
The fuel capacity of a flamethrower is about 3.5 US gallons/13.25 liters and will last for a continuous 60-second burn.
Flamethrowers use a variety of fuels, including gasoline, oil, diesel, and napalm.
A flamethrower consists of two tanks, a wand housing, and an ignition system. One tank holds the flammable liquid mix, while the other holds a pressurizing agent (such as CO2) to propel the flammable liquid.
The range of a flamethrower varies depending on the fuel and model. The M1A1 flamethrower, for example, has a range of 50 yards, while the X15 flamethrower has a maximum range when using a 90% diesel and 10% gasoline mix.
Flamethrowers can be dangerous and are subject to regulations in certain states. It is important to follow safety guidelines and store them in a secure area when not in use.











































