Like the idea of storing energy for laser weapons mounted on ships in a flywheel.
Ships move in a variety of directions when travelling - how is that going to work with several megawatts of energy (I can't convert that in my head to joules or whatever else is appropriate) in a flywheel that's basically going to strongly resist non-linear motion? They'd better bolt the darn thing down good & hard if they don't want it tearing free & flapping around, and the hull is going to need to be strong enough to cope too. OTOH this may give the boat a much smoother progress through the ocean than usual.
I'm fascinated to know if this has been considered at all.