According to BAE the up-armed, Batch II Hunter, maintains 85% commonality with the existing ships that are under construction at Osborne, South Australia. The most significant difference is the removal of the Thales Sonar 2087 towed array and various other unspecified Anti-Submarine Warfare (ASW) systems.
It would also involve “minor” changes to the ship’s propulsion and power systems to accommodate for the increased top weight of the high-mounted VLS cells.
The proposed modifications would have a “minimal” impact on cost and a “negligible” impact on schedule so long as build of the modified design commenced with Batch II, rather than Batch I ships, Lockhart said.
BAE is also exploring alternative ways to up-arm the frigates through the use of
containerised air-defence and surface-to-surface missiles.
Right now, however, a decision has not been made and BAE is simply “offering options” to its customer which is the Australian Department of Defence and RAN. The original Hunter class contract, signed in 2018, always included scope for redesigns between each batch of three ships.