Corvettes might be a good idea for coastal ASW so long as they are equipped with adequate weapons systems to deal with the modern submarine threat. That means an anti-air warfare system like SPY-1K which can deal with submarine launched missiles (I wonder if CEAFAR will be shrunk to Corvette size?) and ASW systems with adequate range to hit a sub with long range torpedos and missiles such as a helo (manned or unmanned) or anti submarine missiles. My question is whether both requirements can be fitted onto a small hull? (happy for an answer from anybody). Alternatively would a very fast Corvette that can quickly run down an enemy sub and hit it with lightweight torpedos be the answer? If none of these options work I think we would be better off just getting more frigates.
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