Defensive Fixed Counterweight Trebuchet Design
by Leonardo da Vinci
A sketch from Leonardo da Vinci’s notebook illustrating
a fixed counterweight trebuchet for long range fortress defense.
Alone, this single trebuchet would have an extremely limited
field of fire. Although the range could be varied by changes in counterweight
mass, sling length and release angle , the fixed orientation of the main
axle and beam provides only a single line of fire.
da Vinci probably envisioned a system of trebuchets, placed
at varying angles about the defensive perimeter, creating an overlapping
field of fire within a natural or manufactured approach. This would inhibit
the enemy from establishing their own artillery emplacements, forcing them
to attempt more dangerous and costly sapping, scaling , or ramming operations.
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