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So to start, they designed those ships to replace the role of a frigate.. well sort of the main focus was to get a ship that was fast enough to engage smaller surface warfare ships in litoral waters as well as preform a few other mission roles, the designers created a modular system that was supposed to be plug and play pull into port and swap the modules out in a couple of weeks and be ready for a whole new mission set.


The swap out wouldn't require going into dry dock or to the ship yard and could be done by the crew. This was all in theory unfortunately in reality the swap out took months and cost tons of money and couldn't be done by the crew so eventually they gave up and made the ships set into what ever mission modules they had on board and scrapped the rest, all future ships would no longer have the swap out options requiring more ships to be built to cover all the mission types.


That was strike one failure to meet multiple mission demands. Strike two was the propulsion plant, they had this half jet drive half turbine system and the ships had some sorta special transmission that would allow them to combined the two systems and gain a few extra knots of speed, unfortunately the transmission failed to work properly and created a situation in which the ship couldn't do more then 14 knots, and the fix required a whole redesign of the systems and lengthy dry dock times.  This also cost tons of money. So another main selling point of the ship as well as mission requirement speed was lost.


The final straw was the aluminum hull, it was cracking left and right and the Navy had to put special temp regulations on how fast the ship can operate and in what sea states basically the ships couldn't go out in anything greater then a simple storm and if they were out and the weather got bad they had to nearly go dead stop and wait it out while getting beat up by the sea state.. imagine a call over the 1MC from the captain hey guys it's getting a little choppy we got shut down and wait here in the middle of the Pacific for a little while.


These temp regs got renewed multiple times and these ships became so limited in what they could do the navy just said nope we're done..


Now they are designing a frigate which is what they should have did from the start in the mean time they are actually considering pulling what ever frigates they have left in mothball and refurbing them.


As for the Zumwalt.. that ships keeps exceeding the budget limits and they still don't even know if it's a good boat..


I kinda cliff notes it for ya but that's the rough and dirty of it, the ships failed to do pretty much everything they were supposed to do and in the end couldn't cover the hole in the Navys future mission plans left by the down sizing of the fleet and removal of the frigates.


I got to be on the USS San Antonio during it's sea trials I was attached to a Marine amphib unit that was brought on board to see how the ship handled at full capacity


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