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Flamethrower

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A flamethrower is a ranged incendiary device. It is designed to project a controllable jet of fire. These tools serve different purposes depending on their use. Most military flamethrowers use liquid fuels like heated oil or diesel. In contrast, commercial flamethrowers often use gaseous fuels like propane. Gases are safer for peacetime because they have a lower mass flow rate. This means the flames dissipate much faster and are easier to extinguish.

Beyond combat, flamethrowers help with land management. They are used for controlled burning and sugarcane harvesting.

Modern man-portable flamethrowers consist of two main elements. These are a backpack and a gun. The backpack typically contains two or three cylinders. In a two-cylinder system, one cylinder holds flammable liquid. The other holds a compressed, inert propellant gas, such as nitrogen. A three-cylinder system often places the propellant gas in a central cylinder. This design helps the soldier maintain their balance while walking.

Type 93 japanese flamethrower
Type 93 japanese flamethrower

The gas pushes the liquid fuel through a flexible pipe into the gun. The gun contains a small reservoir and a spring-loaded valve. When the operator pulls the trigger, the valve opens. The pressurized liquid flows over an igniter to create the flame.

Usafl notes
Usafl notes

There are different types of ignition systems used to start the fire. One simple method uses an electrically heated wire coil. Another method uses a small pilot flame fueled by pressurized gas. In some liquid-operated models, a pre-ignition line exists. This line carries gas to an ignition chamber behind the gun assembly. The gas mixes with air and is ignited through piezo ignition. This creates the flame seen in front of the gun in many documentaries.

Da Nang, Vietnam.... Sergeant Robert E. Fears clears an area using his flamethrower. - NARA - 532491
Da Nang, Vietnam.... Sergeant Robert E. Fears clears an area using his flamethrower. - NARA - 532491

This pre-ignition flame then ignites the liquid fuel as it passes through.

History shows that projecting fire has been used since ancient times. During the Peloponnesian War, Boeotians used devices to attack Athenian walls. An admiral named Pausistratus used a "fire-bearer" on his ships. This was a funnel-shaped container of combustible material on a pole. The pole was suspended by an iron chain from the ship's prow. This allowed the fire to be discharged safely away from his own vessel.

Boeotian flame thrower, 5th century BC, Greece (model)
Boeotian flame thrower, 5th century BC, Greece (model)

Later, the Byzantine Empire used "Greek fire." This substance was likely invented by Kallinikos of Heliopolis around 673 AD. Byzantine sailors used hand-held siphons called cheirosiphona to shoot bursts of this fire.

Chinese Flamethrower
Chinese Flamethrower

China also developed advanced fire technology during the Song dynasty. Around 919 AD, a piston flamethrower called the Pen Huo Qi was invented. It used a substance similar to naphtha or petrol. The Chinese used double-piston bellows to pump this "fierce fire oil" from a cylinder. They ignited the stream using a slow-burning gunpowder match. This was one of the first recorded uses of gunpowder in warfare. By 1044 AD, Chinese manuscripts even showed mobile flamethrowers on four-wheel push carts.

Chinese Flamethrower
Chinese Flamethrower

During World War II, flamethrower use increased significantly. They were used as tactical weapons against fortifications like bunkers and pillboxes. Soldiers could bounce the stream of liquid off walls to reach unseen spaces. To minimize risks, many nations mounted flamethrowers on armored vehicles. The United States and the Commonwealth were very prolific users of these vehicles. The British and Canadians used "Wasps," which were Universal Carriers fitted with flamethrowers. Starting in mid-1944, these were incorporated into infantry battalions.

German Brennkommando-firing Warsaw 1944
German Brennkommando-firing Warsaw 1944

Other tank-mounted versions included the "Badger" and the "Oke."

Operating a flamethrower involves many serious risks. The weight and length of the weapon impair a soldier's mobility. Because they use fuel very quickly, they only offer a few seconds of burn time. This requires the operator to be extremely precise. The weapon is also very visible on the battlefield. This makes operators primary targets for snipers and marksmen.

US riverboat using napalm in Vietnam
US riverboat using napalm in Vietnam

There is also the danger of the pressure tanks exploding. If a tank is hit by bullets or grenade shrapnel, it can rupture. This can kill the operator instantly. In movies, the range is often shown as very short. However, contemporary military versions can incinerate targets from much further away.

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🖼️ Images & Media (17)
File:Type 93 japanese flamethrower.jpg
Type 93 japanese flamethrower.jpg
Da Nang, Vietnam.... Sergeant Robert E....
Flame Thrower.webm
File:German Brennkommando-firing Warsaw 1944.jpg
German Brennkommando-firing Warsaw 1944.jpg
File:Flame-thrower-new-orleans-show.jpg
Flame-thrower-new-orleans-show.jpg
File:Usafl notes.jpg
Usafl notes.jpg
File:Boeotian flame thrower, 5th century BC, Greece (model).jpg
Boeotian flame thrower, 5th century BC,...
File:Chinese Flamethrower.JPG
Chinese Flamethrower.JPG
File:Chemical Warfare Service - Liquid Fire - The way by fire has proved to be a boomerang to the Germans - NARA - 26425078 (cropped).jpg
Chemical Warfare Service - Liquid Fire -...
File:Bundesarchiv Bild 183-R22888, Westfront, Flammenwerfer.jpg
Bundesarchiv Bild 183-R22888, Westfront,...
File:Belgisch-soldaat-slachtoffer-vlammenwerper.jpg
Belgisch-soldaat-slachtoffer-vlammenwerper.jpg
File:Swedish volunteers with ROKS-2 flamethrower (36446136521).png
Swedish volunteers with ROKS-2...

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