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A catapult can be as small as a rubber band slingshot used to skim rocks across a pond or as large as the 90-m (300-ft) long steam units used to launch airplanes from aircraft carriers.
Catapults were used in ancient and medieval warfare until the introduction of the gunpowder cannon in the 14th century.
Hydraulic catapults used a pressurized fluid to release energy and accelerate an airplane attached to the moving tow bar.
Catapult devices were even used in recreational sports, such as trap-shooting, in which elastic catapults hurled inanimate targets in the air for hunters to shoot.
Catapults were usually assembled at the site of a siege, and an army carried few or no pieces of it with them because wood was easily available on site.
Subsequently, torsional catapults were developed; those with two torsion powered arms, the later versions of the ballista and oxybeles, and those with one torsion powered arm, the onager, known in medieval times as the mangonel.
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