Ah, I see what you're saying. You want the counterweight to stay on the arm for another 180° of rotation and then released on the upswing.
I just cant conceive of any structure could survive the impulse forces of 100,000 tons out of balance while we wait to get that upswing release of the counterweight.
The only way for the arm to survive would be to release both the projectile and the counterweight at the same instant. The projectile goes up and the counterweight goes down. This is the engineering problem I wouldn't want to be responsible for solving.
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