The Gremyashchiy -class corvettes differ from their predecessors of the Steregushchiy class by greater dimensions and displacement. They have a steel hull and composite superstructure, with a bulbous bow and nine watertight subdivisions . Compared with the Soobrazitelny , Boikiy , Sovershennyy and Stoikiy ships, which are fitted with Redut air defense VLS system of 12 launchers on the bow, these new ships are equipped with a UKSK VLS system comprising 8 launchers for SS-N-30 , SS-N-27 or SS-N-26 cruise missiles instead. The Redut VLS system with 16 launchers has been replaced on the stern. Another difference is the lack of the aft mast above the helicopter hangar, and single integrated mainmast that no longer includes separate open shelves for artillery and navigation radars.
The purpose of building such a mockup is to test electronic interaction/interference between the Type 055's multiple radars, communications and other electronic equipment in the real world. Conducting such tests before launching the first Type 055 cruiser allows for modifications to the electronics set up to be more easily changed, as well as on site support from electronics laboratories. However, the test rig is not an accurate representative of actual Type 055 layout (the helicopter hangar in the rear has no door, and no anti-stealth radar has been installed over it, as is the case with the Type 052C and Type 052D destroyers).