What direction would torque be on a trebuchet in motion

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SUMMARY

The torque direction on a trebuchet in motion, specifically when the swing arm is parallel to the ground, is clockwise if the trebuchet is firing from left to right. The heavy counterweight generates this torque, causing the arm to rotate. Additionally, due to the conservation of angular momentum, the frame and the Earth rotate in the opposite direction, albeit minimally, when the trebuchet is armed and during its firing motion.

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What direction would torque be on a trebuchet in motion at the point where the swing arm is parallel to the ground?
 
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The heavy counter weight produces a torque that causes the arm to rotate. If it's firing from left to right (as you look at it) then the torque on the arm is clockwise.

Note: If the arm and counter weight rotate one way (eg clockwise), then the frame and the planet it sits on rotates the other way (due to conservation of angular momentum). The amount the planet rotates will be exceptionally small but it does rotate. Just as it rotated the other way when the trebuchet was armed.
 

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