How a Trebuchet Catapult Works
trebuchet consists of five basic parts: the frame, counterweight, beam,
and guide chute.
The frame supports the other components and provides
a raised platform from which to drop the counterweight.
The counterweight, pulled by gravity alone, rotates
the beam. The beam pulls the sling.
The guide chute guides the sling through the frame
and supports the enclosed projectile until acceleration is sufficient to
hold it in the sling.
The sling accelerates and holds the projectile
the Beam Accelerates the Projectile
One end of the sling is fixed to the end of the
beam, while the other is tied in a loop and slipped over a release pin
extending from the end of the beam. As the beam rotates, it pulls the sling,
with its enclosed projectile, down the guide chute. As the sling exits
the chute, it accelerates in an arc away from the beam, but because the
beam is still pulling the sling behind, the loop is held on the pin.
the Sling Releases the Projectile
The sling continues accelerating through its
arc until it eventually swings ahead of the release pin. At this point,
known as the release angle, the
loop slips off the pin and the sling opens...
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