Shekhar Singh
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It's not that easy. Different parts have different weights and changing the existing with new parts will change center of gravity two. It's a lengthy process but if it's done and total weight by 10% and some RCS get reduced then requirement for engine change will be eliminated and we get the desired TWR with same Engine.I already mentioned the increase in cost giving Rafale as example but how costly will be components & overall product depends on governance model of a country. Our country is not fully capitalist & privatised. And RCS reduction in 5th gen heavily relies also on customized composite, not just RAM, shaping, EW, etc. Composite is not some fixed composition material available globally. Different country research & come up with different % of materials in it. Some composite may offer more weight reduction, some offer more RCS reduction, some more strength. The ratio of & type of materials matter a lot just like in alloys. Different composites are used on different areas of airframe.
I think newer blocks of F-15,16,18 are using composite which also increase life of airframe. We should compare with better things & survivability bcoz a pilot's life is on the line. And to reduce human loss only UCAVs are being researched.