The Catapult Created by ROMZ

Chapter I

What is a Catapult?

Catapult Definition

A catapult is called a siege weapon for during medieval times it was used on sieges against castle walls or destroying any time for fortification. For a catapult to be considered a ‘real catapult’ it would have to be significantly large for any single person to carry.

The Catapult's History

A Catapult is a siege weapon developed by a Greek man called Dionysius the Elder of Syracuse around about 400 BCE. The earliest writing of catapults was in China around the 3rd and 4th century.

From Dionysius’s time evolved two types of catapults. First a two-armed catapult called the ballista. Unlike the normal one-armed catapult which hurls rocks; the ballista fires arrow or projectiles with great amounts force over a long distance.

Modern Catapults

Catapults become obsolete

Catapults had become ineffective in warfare in about 885-886 AD because of new advances in defense. Catapults had spent too much time to reload and relocate. It always required more than a single person to do anything with a catapult. Cannons replaced catapults as to being more effective and efficient. Cannons can be reloaded by a single man, and moving cannon would take far less time. Basically, when gunpowder was invented by the Chinese in the 11th Century catapults became obsolete.

Types of Catapults

The There are several types of existing catapults, however, there are four main types of catapults: There are several types of existing catapults, however, there are four main types of catapults: mangonel, trebuchet, onager, ballista.

The mangonel catapult is a military device used to throw missiles. It had a 'bucket' attatched to a platform and spring. The mangonel releases it’s item with torsion power/force- a force created using a twisting object- and stops when the plunger hits the slap/piece of wood in front of it.

The trebuchet is a more gravity-powered catapult. Most trebuchets are on wheels and have a sling- for the object/ball- and counter weight (usually a bucket). One side of the trebuchet is where the object you are aiming is in a sling, the other side is where the counter weight is going to be dropped into/onto a bucket/platform. Once the counter weight is dropped suddenly, the force of gravity allows the object in the sling to travel.

An onager is similar to the mangonel catapult- almost a mix of them both. The main difference is that the onager usually has a sling instead of a bucket/spoon. The onager is torsion powered and is stopped by a narrow wooden slab (like the mangonel), but also uses a sling (like the trebuchet).

The ballista catapult is the catapult that developed into a gun, it's design is similar to the crossbow design. The ballista is torsion powered- it uses a sort of elastic material (rubber bands) to launch the object in the directed direction given by the user. catapult is the catapult that developed into a gun. It’s torsion powered- it uses a sort of elastic material (rubber bands) to launch the object in the directed direction given by the user.

What has become of You

Catapults Today

Modern Catapult's Use

Today catapults are no longer used as a weapon of warfare. In modern days, catapults are used as toys such as slingshots to sling stones and other small objects. Catapults are also being used on aircraft carriers to be able to provide the aircrafts enough speed to able to fly off a short runway. Catapults are also being used for clay shooting which is a type of sport that improves accuracy with a gun. The catapult is used to sling the projectiles high into the air so that the hunter could practice shooting before starting on live moving targets.

Chapter 2

Choosing a catapult

The Mangonel Catapult

Why choose an Mangonel? We decided to build a Mangonel catapult because we believed that this type of catapult has the potential to throw a projectile an incredible distance. Using the tension of bands attached to both the crossbar and the base, a mangonel can fire objects with an incredible force. This coupled with the mangonels simplistic design made the decision of what to use very easy.

Materials Needed

  • 3 pieces of wood (5//8 square) 6.5 inches
  • 2 pieces of wood (5//8 square) 23 inches
  • 2 pieces of wood (5//8 square) 15 inches
  • Diagonally cut wooden square (16 x 15 inches)
  • 1 cube made of wood (1.5 x 1 inches)
  • 2 dowels (3 inches)
  • 1 metal rod
  • 1 black string
  • Multiple nails and screws
  • String
  • Twine
  • Drill
  • Glue

Chapter 3

Constructing the catapult

Work Log

May 1 , 2017

Mohamed buys structural pieces for Mangonel.

May 3, 2017

Osman and Mohamed construct main structure for the Mangonel. Base was created and support was also created

May 4, 2017

Mohamed adds crossbar and drills holes for the later installment of the arm.

We choose to rebuild the catapult on account of its small size and significant lack of proper stability. The change helped and made the catapult alot more powerful than its original design

May 7-10, 2017

Michelle and Jack rebuild same design. Larger base was created and support was also created. Crossbar and arm were installed, and the catapult's main power-the twine passing through the arm-was installed along with black string for lift support. The arm is being kept down by a metal rod passing through it towards the end of the catapult.

May 16, 2017

Osman and Mohamed add secondary source of power to catapult because lift power is not enough. Thick rubber bands have been stapled to the crossbar and arm for more power

May, 21, 2017

Jack and Michelle tie a few thick rubber-bands and staple them from the arm to the main structure as too increase force exerted from the arm

Work Cited

"Catapult Physics." Real World Physics Problems. Web. 07 May 2017.

Writer, Leaf Group. "Modern Uses of a Catapult." Sciencing. Leaf Group, 24 Apr. 2017. Web. 12 May 2017.


Created with images by rebel1965 - "catapult weapon shooting" • juliacasado1 - "trebuchet catapult medieval weapon" • Pexels - "military war vintage" • michael pollak - "slingshot" • Son of Groucho - "Catapult"

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