Even the LCS is massive overkill for the mission- something like the Chinese Type 37 would be more than sufficient.
You already have that. It's called a National Security Cutter or a High Endurance Cutter.
At $400 million USD a copy, even the
Bertholf class USCG Cutters are overkill!
In truth any military ship is overkill. Stabilised AFV sized weapons will always be when your opponent only has hand weapons.
For anti-piracy missions, what you truly need is more along the lines of a re-designed Reliance class Cutter.
The Reliance class doesn't have its own helicopter. A helicopter is a must since it's the only maritime asset capable of responding fast enough.
Replace the forward 25mm chain gun with a 30mm Bushmaster II,
Why? The 25mm already outranges anything they have.
add several more .50 caliber MG's along the main deck,
What for? Why would you want to enter their effective range when you have a perfectly good stabilized gun capable of dealing with them at ranges where they'll be unable to respond.
and trade the aft flight deck for a pair of stern ramps to launch 'Short-Range Prosecutor' 7m RHIBs.
See above for why that would be a bad idea.
The 18 knot top speed could use an increase to about 20 knots, but that is doable without a lot of major alteration.
The ships speed is a non issue. Once the pirates are onboard you'll have maybe half an hour to respond at most, assuming the ship has a proper safe room. Whether you're doing 18 or 20, or even 40kts won't matter unless you're close enough to shoot them before they get onboard in the first place.
Personally, I'd also add pair of TOW box launchers cribbed off a Stryker AFV to give the whole package enough punch to do combat with something it's own size.
What purpose would that serve? You already have the means to kill them well before they'll even have a chance to open fire at you
This vessel would have sufficient to speed to chase down a captured merchant,
If it comes to chasing the ship then you're no longer dealing with an attack, but a hostage situation. That means negotiation and/or Special Forces of some type or other. The ships speed and armament will be irrelevant.
sufficient armament to kill anything a pirate might show
As I've said, any stabilized weapon is sufficient to do that. The issue here is not killing them, it's finding and identifying them.
enough bulk to handle an RPG strike or two,
Just about anything larger than a RHIB should be capable of that.
It would also cost a fraction of any other option mentioned so far.
But it wouldn't be able to do a fraction of what they can do either.
Controlling pirates has to be done on the most penny-pinching budget possible; there are just too darn many of them to start talking about ships with pricetags in the $500 million USD ballpark.
However, those @500 million ships are already here. Your cheaper alternative isn't, and it won't be able to deliver any meaningful result.
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