Then what is the use of having built 1 F22P 'at home'?
Please compare the 3rd ship from the left (C28A, a further development on the F22P, for Algeria, with Western CMS and radar) and with the first ship (056), which is HALF the tonnage. This limits its sensor and weapons capability, aviation as well as its sea keeping and endurance.
Details and a near-definitive model of the C28A first emerged during the DSA show. According to CSTC officials, the ship is about 120 m in length, with a beam of 14.4 m, a draft of 3.87 m, a standard displacement of about 2,880 tons, and a full-load displacement of more than 3,000 tons.
Chinese sources suggest it is an evolution of Pakistan's F-22P on the basis that Algerian naval teams visited Pakistan to see that frigate's operations first-hand. The C28A also appears to borrow design elements from the Type 054A frigate of the Chinese People's Liberation Army Navy.
The C-28A's combat system is largely Chinese with the exception of the Thales Smart-S Mk 2, associated multifunction operator consoles (MOC)/Tacticos cluster, Link Y datalinks, and associated consoles. Four or so MOC for the Smart-S are integrated with a CSTC-supplied combat management system (CMS).
Weapons include a single 76 mm gun - the export variant of which is known as NG-16-1 - two quad launchers for C-802 or C-802A anti-ship missiles mounted transversely amidships, an octuple FM-90N launcher for short-range HQ-7 surface-to-air missiles, two 30 mm Type 730B close-in weapons systems (CIWS) similar to the ones on the F-22P, two triple-tube torpedo launchers that fire through an opening in the hull, and four 24-barreled decoy launchers.
As well as the Smart-S Mk 2, sensors include two navigation radars - an I-band (X-band) set and an E/F-band (S-band) set - that are thought to be Kelvin Hughes SharpEye radars. The C28A also has a radome for what is likely to be a Type 364 radar, two fire control radars (FCR) from the Type 47 family, and what looks like a Type 343G FCR with a combined radar and electro-optic system that is identical to the sets mounted on the F-22P.
The electronic warfare (EW) suite appears to be similar to the F-22P's. Speculation that its sonar will be of Chinese origin has yet to be confirmed.
The propulsion system consists of four MTU diesels. In a departure from existing designs, there is no funnel stack. Instead, the diesels exhaust near the waterline as they do on MEKO-type frigates to minimise infrared signatures. Top speed is expected to be around 30 kts. The hull has two sets of fin stabilisers as well as bilge keels.
The ship has hangars for boats and a helicopter. The latter will presumably be able to accommodate one of the AgustaWestland AW-159 Wildcat helicopters in service with the Algerian Navy.
First Algerian C28A corvette launched in China - IHS Jane's 360