Category Archives: Siege Weapon

All About Trabucos

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Trabuco is siege weapons most commonly used in the medieval ages. They operated with a sling mechanism that would throw a boulder or other item miles away. The purpose of the trabuco was to crush walls or throw their projectile over them.

A trabuco’s design is like a giant sling. The parts of a trabuco consist of a large wooden pole levered on a motor. On the longer side, there is a sling. On the shorter side is a stabilizer. The trabuco works by converting potential energy into kinetic energy. Part of the energy leaves, turning into friction.

There are two types of trabucos. The traction trabuco uses manual force to launch the sling. It took 20 to 45 people to work this type of trabuco. The most common type was a counterweight trabuco which uses weight instead of manual force to throw the object.


The history of the trabuco starts at the Crusades. An Islāmic scholar wrote that trabuco was the machine invented by unbelieving demons. There were also reports of trubcos being used in China in 1268 when the Mongols attacked China according to The trabuco made it to England in the 12th century. King Richard had two that he named ” Gods Catapult” and ” Bad Neighbor.”

The trabuco went out of popularity with the rise of gunpowder. In 2013 a trabuco was used in the Syrian war. Rebels used trabuco’s to hurl explosives at the government. In 2014 Ukraine used a trabuco to throw bricks at Berkut.

A Trabuco is technically a catapult since a catapult is any machine that flings things into the air. The main differences between a trabuco and the catapult that most people think of are the item load and release. In a catapult, a large springy piece of wood is wound up. The load releases when the wood is let go and hits a stop.


Middle Ages Siege Weapon – The Trabuco

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The trabuco was a weapon used in the later part of the Middle Ages (circa 5th to 15th centuries A.D.) used to demolish fortress walls or to send flying projectiles over them. This instrument of war was able to effectively transform gravitational potential energy into kinetic energy. It is also known as the counterweight blunderbuss.

The trabuco was capable of hurling projectiles weighing 300 pounds up to 875 yards and was fairly accurate according to The physics behind the trabuco is one of counteracting proportion. Employing a counterweight of different measures would determine the velocity and range of the weapon. The larger the counterweight used, the faster and further would the projectile be hurled. Some historical reports on indicate that disease infected bodies were used as projectiles as an early form of biological warfare employed in the Middle Ages.

The exact history of the invention of the trabuco is somewhat sketchy. The invention actually derives from the more simple technology of the sling. An evolution of the concept of the sling employed a small piece of wood to provide a better lever and extend the range of the weapon. This evolution continued thanks to the Chinese, but the first reports of a counterweight blunderbuss do not appear in the Chinese historical records until 1268. It is surmised that it may have been developed in the Jurchen Jin dynasty (1115 – 1234 A.D.) according to

The counterweight blunderbuss, or trabuco, appears in the historical record in Europe during the Byzantine Empire. During an attack on Lisbon in 1147, it was recorded that two trabucos had the capability to launch a projectile every fifteen seconds. Richard the Lionheart employed two trabucos in the attack on Acre in 1191. He named the two trabucos “God’s Own Catapult” and “Bad Neighbor.”

As it turns out, the eventual end of use of the trabuco as a primary weapon in warfare takes us back to China and the invention of gunpowder. The earliest historical record containing the formula for gunpowder is from the Song dynasty (11th century A.D.). The weapon of choice in warfare for attack and siege became the canon.

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