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Catapults and Propulsion. Milbank High School . What are Catapults?. A machine that stores energy then quickly releases this energy to fire a projectile Usually very large (larger than what a person can carry) Slingshots, bows, etc are “small” catapults. History of Catapults.

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Catapults and propulsion

Catapults and Propulsion

Milbank High School


What are catapults
What are Catapults?

  • A machine that stores energy then quickly releases this energy to fire a projectile

  • Usually very large (larger than what a person can carry)

  • Slingshots, bows, etc are “small” catapults


History of catapults
History of Catapults

  • Developed from crossbows

    • They just got larger and larger

  • First developed in Greece in 3 or 4th Century B.C.

  • Most were no longer used after the invention of____________

    in the 14th century.


History of catapults1
History of Catapults

  • Projectiles

    • Stones, arrows, boulders

    • Dead, infected animals (biological warfare)

    • Beehives


Types of catapults
Types of Catapults

  • Ballista

    • Powerful crossbow

    • Greeks, Romans

    • Range of over

      500 yards


Types of catapults1
Types of Catapults

  • Mangonel

    • Medieval period

    • Romans

    • Long distance,

      bad accuracy


Types of catapults2
Types of Catapults

  • Trebuchet

    • Counterweighted

    • Could throw 50-

      100 kg objects

      over 300 meters

      and be fired once

      every 15 seconds


Types of catapults3
Types of Catapults

  • Trebuchet Con’t

    • Sometimes threw larger stones (1500 kg) to break through walls

    • Castles were built with lakes around them far enough so the trebuchets couldn’t get close enough to work

    • http://www.cs.wisc.edu/~englet/catapult.html


Physics of catapults
Physics of Catapults

  • http://www.cafepress.com/buy/engineering/-/pv_design_prod/pg_1/p_storeid.76346291/pNo_76346291/id_14677278/opt_/fpt_/c_360/


Physics of catapults1
Physics of Catapults

  • Some catapults work because of some stored tension

    • In a rope, bent wood, or possibly rubber bands

  • Trebuchets

    • Counterweighing


Physics of catapults2
Physics of Catapults

  • Ideal launch angle?

    • 45°

    • Think of the flight of a baseball home run, or football kickoff