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HAL currently makes AL31P engines from Roosi supplied tooling. Can they make their own tooling from scratch to the same specifications independent of inputs from Roosis? Can they using their own tooling, make AL31P engine same as using Roosi supplied tooling? Most importantly, is HAL capable...

Nope, Hanwa did not transfer the titanium forging tech or the barrel tech, which is not unexpected. No choice but to develop it ourselves.

^^ That looks like the TATA ATAGS prototype.

Who's making it? Kalyani or TATA?

Doesn't ATAGS include elements from both? I assume that a lot of inputs from Bharat 52 would have flowed into ATAGS with Kalyani getting involved.

Bharat Forge acquired Noricum, which was the chief manufacturer of the improved GC-45, originally designed by Gerard Bull. They brought the entire manufacturing to India. I think its reasonable to assume that this included barrel manufacturing and forging tech as well including Titanium alloys...

Is that the case? I was under the impression that one of them will be selected for the final design and DRDO and army will persist with that. Of course, minor elements from one can be incorporated but is it really possible to "merge" the two guns into one final design? Wouldn't it require a...

I believe one of the reasons for GSLV ebing relatively "short-legged" so to speak is its design itself. GSLV was basically PSLV scaled up and ISRO opted to cluster 2 engines, Long March has four, naturally that will have an impact on payload capability. Pkus loads of other things.