I'm not sure conservation of angular momentum works the way you're describing (as in their moments would fully cancel). That means that they also wouldn't act t

I'm not sure conservation of angular momentum works the way you're describing (as in their moments would fully cancel). That means that they also wouldn't act to improve stopping force/torque. https://physics.stackexchange.com/questions/79699/dynamics-of-counter-rotating-flywheels https://physics.stackexchange.com/questions/79699/dynamics-o...