With the 5-5-5 missile probably being <300kg and HQ-16 probably being >600kg, I don't see the former as a complete replacement for the latter. No doubt the 5-5-5 missile can compete with and potentially surpass the performance credentials of HQ-16 as it was initially fielded, but those same advancements in propellants can be applied to the HQ-16 to further expand its performance envelope, i.e. HQ-16C. The larger volume of HQ-16 can also accommodate a larger and more powerful seeker and a larger warhead.
If a new generation of propellants is allowing Sea Ceptor (a 100kg Sidewinder/RAM/HQ-10-class missile) to be advertised with 25km range, and for ESSM Block II and 5-5-5 missile to be firmly classed as medium-range missiles, those same developments can increasingly push HQ-16/Buk into the long-range category. What is imperiled here is not HQ-16, but HQ-9. There are considerable applications for extended-range munitions, ballistic missile defence, etc. but as smaller munitions improve, the need for an enormous 1300kg munition (with an Exocet-sized warhead...) as the standard long-range SAM becomes increasingly questionable, much as the giant >2000kg SAMs of the 1950s and 1960s were eventually deprecated.
I don't think 5-5-5 will be a full replacement of HQ-16, but rather that with 5-5-5 and HQ-9 variants, that I don't think there necessarily has to be a role for HQ-16.
HQ-16 as a missile is of course a fairly sizeable missile, and with future developments it can probably reach well over 200km and even get to near 300km.
But is it actually worthwhile pursuing such developments when the HQ-9 family already exists, and is already integrated in the UVLS?
As a larger missile to begin with, HQ-9 has the benefit of having more growth potential by being a larger airframe for more space for propellant and more space for electronics as those get further miniaturized and made more efficient. Being a larger airframe, you also get more space to work with as other advancements such as multimode guidance, attitude control motors, get developed too.
HQ-9 can be developed to become a very long range SAM (400+km) if a booster gets added to it to make use of the 9m length UVLS. A "Super HQ-9" for colloquialism's sake.
Meanwhile, existing HQ-9s using the same baseline HQ-9 airframe footprint can still have new variants developed with advancements to maximize kinematic properties and pK for the medium to long range profile.
All of which is to say, that going into the future, perhaps the "baseline" expectation for a proper long range area air defense SAM would be a fairly heavy 1.3 ton (or greater! SM-6 is 1.5 tons) SAM with all of the advancements that the future will offer -- new propellant and multipulse motors, multimode terminal guidance with large apertures, advanced midcourse/CeC capabilities, attitude thrusters for increased kinematic properties, new lighter weight materials, etc.
Putting all of that into a HQ-16 sized missile might be more difficult than working with an existing larger airframe that HQ-9 has.
I.e., for the UVLS, you'd have:
- 5-5-5 for CIWS range to medium range (50+km)
- HQ-9 variants for medium range to long range (50km to 200km)
- "Super/booster equipped HQ-9" variants medium range (technically capable for it but practically wouldn't be used for it) to very long range (50km to 400+km), for the 9m UVLS
If you have all three of those, then is there really a reason for HQ-16 variants?
The early HQ-16 variants are made obsolete by the 5-5-5 which they can quad pack and still attain the same engagement envelope.
The later HQ-16 variants will occupy the same engagement envelope as the HQ-9 variants while still taking up the same one cell volume of a UVLS.
I suppose keeping later HQ-16 variants around to replace the HQ-9 variants would be reasonable if they could somehow multi-pack HQ-16s in the UVLS, but if they can't do so then it's probably better to just streamline everything with HQ-9 variants instead.
Thanks. I thought Yu- was the prefix for torpedoes and CY for the missiles, but these details often escape me.
Yu- as I understand it is for any type of torpedo weapon.
I don't think CY is a PLA designation in general.