Short of a specific rule, the only ones that would come to mind would be the usual R8, stating:
Quote:
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Originally Posted by R8
ROBOT parts shall not be made from hazardous materials, be unsafe, cause an unsafe condition, or interfere with the operation of other ROBOTS.
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Emphasis mine.
If the catapult would be fully enclosed by the robot and you're fairly certain that no one could get an extremity pinched or hit by said catapult then I think you would be fine.