re: PLAN Type 052 Class Destroyer
052B served as the prototype for the 052B/C platform (hull, engines, etc). 170 was the prototype of the 052C design, 171 is the first production model, which despite their similar look is very much different from 170. The reason of the production pause is entirely due to 2010 Shanghai Expo, I believe C4-C6 were actually ordered shortly after the completion of 171. 150 again became a prototype to test the C3-C6 platform due to the entirely domestic propulsion systems.
051C is the insurance policy to 052C should the latter fail (i.e. 053K). Regarding the SAM you do realize 051C uses Rif-M, a dedicated naval SAM system much like HHQ9, right?
170 and 171 were built and launched at the same time, just like the two 052Bs were.
The above is a picture showing all four outfitting together in my
, nine years ago.
I believe the insurance policy for the 051Cs had much more to do with engines and proplusion than anything else. the 051C took advantage of the Chinese ability at the time to produce their own, older engines for those two vessels, where as the 052Cs were the PLAN going in the Gas Turbine direction for their new, area defense vessels. If they could not produce or procure suffient or capable enough gas turbines, they could always have continued building the relatively capable 051Cs until they could.
Now it is clear that the 052C and now "D" will be the mainstays.
The 2 x Type 051C pennants 115 and 116
1 x Type 051B 167
2 x Type 052B 168 and 169
And 2 x Type 052 112 and 113
These 7 DDG are all pretty new platforms and can be upgraded with newer systems to keep them as good surface combatants, China would not be reckless and just decommission these valuable ships anytime soon
I owuld throw the four Sovs in there with them, meaning they have Eleven reltively modwern DDGs, all capable of some upgrades and fairly capable in their respective areas.
Then you add the six Lanzhou vessels (Type 052C) and then another six "D" that will be launched by 2015, and in 2015 you end up with:
2 Type 052
1 Type 051B
4 Sovs
2 Type 052B
2 Type 051C
6 Type 052C
6 Type 052 D
That's 23 modern and effective DDGs
On the guided-missile frigate side you end up with:
20 Type 054A
02 Type 054
Or 22 modern and capable FFGs.
I believe by 2015 there could be as many as 30 Type 056 OPVs too.
That becomes a very potent and effective surface force with 23 DDGs, 22 FFGs, and 30 OPVs. 75 major surface combatants in all. As large as the Japanese Navy and with just as many new vessels.
By 2020, the picture is even more advanced for the PLAN. With more Type 052Ds, probably a few Type 055 CGs, probably several Type 054B FFGs and more Type 056 OPVs. Heck, the PLAN may have over 100 modern, majopr surface combatants by 2020...and that does not take into consideration their growing SSK and SSN force, their Amphibious force, or their carriers.