Lethe
Captain
I keep thinking about the Perry as well, and to be honest the reason I think about it is just a reflection of how different the USN of then and the navies of today (including the PLAN today) are.
Frankly, the fact that the Perry was able to squeeze so many subsystems of the time, including dual helicopter hangars, into a 4000t hull was not only impressive, but probably not doable with the sort of requirements of today. I'm not only thinking about damage control, but also the complexity and size of modern subsystems (weapons and sensors), but also the expectations for crew facilities.
The Perry and its contemporary, the Spruance class which entered service at about the same era, were both ships with twin helicopter hangars where large parts of the USN surface combatant fleet outright lacked organic helicopter facilities. The Charles F Adams destroyers, and the cruisers of the era either had minimal helicopter accommodation facilities or outright lacked them. In many ways the Perry and Spruance could be seen as making up the deficiencies for the rest of the fleet of the time, while also orienting themselves for a more ASW role relative to the USN's other surface combatants.
Things have certainly changed, the question is why. My contention is that the essentials of effective ASW favouring dual helo platforms have not changed since the late Cold War period, that what has changed for USN and most allied navies in recent decades is (a) the disappearance of the high-end, high-volume Soviet submarine threat that formerly demanded first-rate attention and (b) lower budgets reflecting that low-threat environment, which translates to fewer helicopters in service, with fewer pilots and technicians, fewer sensor packages, fewer munitions and lower parts inventories, such that having only one helo per ship is ultimately an easy and even attractive compromise to make, because the budget isn't there to do two helos properly anyway. My contention is that what we are seeing with all these single helo, supposedly ASW-focused ships is akin to a "minimum viable product", because services are trying to retain all the capabilities and proficiencies of the past while investing in contemporary and cutting-edge developments, all on relatively shoestring budgets and without clearly defined threat scenarios to focus their attention, leading to force structures that are all breadth and no depth.
It may well be impossible to do dual Seahawks on a modern Perry-sized hull given contemporary systems, crew habitability, survivability standards. But we are talking about a ship that is at least 50% larger than Perry and one that appears to be mostly a new design that is therefore not beholden to the compromises of the past.
The likes of the Marusume/Takanami/Akuzki/Asahi, as far as I can see, have a single enlarged hangar which can accommodate a 10 ton class helicopter and some extra equipment, but does not look able to actually accommodate two 10 ton helicopters side by side. The positioning of the helicopter secure/traverse system relative to the hangar on those ships certainly lends itself in a way that the recovered helicopter takes up 2/3rds of the overall width of the hangar space.
Absent photographic evidence of these ships with two helos in the hangar simultaneously, I am inclined to think you are correct. However I would note again that this is in the context of a force structure that is centered around dedicated ASW helicopter carriers (another concept that I think is worth exploring for PLAN).
Whenever the topic of helicopter hangar count comes up for new PLAN surface combatants (either new classes, or new batches of existing classes), I feel like there is a default expectation that PLAN surface combatants should come with two helicopter hangars, but I think people's reference scales are calibrated a bit incorrectly.
My personal reference scale is late-Cold War USN, secondarily the Soviet Union of the same period and also JMSDF, because I believe that the submarine threat that PLAN confronts today, and the resources that PLAN can bring to bear to meet them, bears a greater resemblance to those eras, services and programs than to any contemporary points of comparison such as the modern European frigate programs. That perspective may well be miscalibrated or even simply wrong, but I hope that it is at least comprehensible.
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