The NERA is attached on to the chassis & can be replaced whenever we want. But it will make the tank heavy. The lighter version of the NG-MBT can have the MHA/RHA & the heavier version can have the HNS. We can use the light version in mountains or for amphibious missions & use the heavy ones in plains & desert.Thanks for the detailed explanation.
So cant we replace RHS with HNS on later date after prototyping etc ?
Replacing the RHA on the Kanchan armour with HNS was one of the initial requirement of the Arjun Mk-1 being upgraded to Mk-1A. DMRL developed the HNS as a part of that upgrade. But the Mk-1A tank was 68 tons with the RHA adding HNS will surely push the weight to 70+ tons. Therefore it was dropped.
The need for HNS would be lesser if the hard kill APS was ready. But we are gripped with stasis there. DRDO's own system isn't ready & it is not even mentioned as an ongoing project in DRDO's publications. Wonder if they just closed the project or something. We could just buy the Israeli APS in the meantime, but nope. We will just sit there.