SSBN? You mean nuclear powered nuclear armed subs?
Does India have any experience with floating reactors? Who is giving them reactors?
I already posted about it see this.
Steel cutting of Indian Navy's first Nuclear-powered attack submarine SSN to take place in 2021. Total of 6 to be built the design is finalized. SSN design externally will be closer to western designs with eastern influence, while the internals will be split between western and eastern. 4 cluster of "x" celled VLS That would be 16 to 20 Missiles.
The design from Defexpo video screengrab Could be similar. Arihant silo will be the base, cut costs complexity and time. The SSN will use electric propulsion in place of gear box.
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DRDO & industry are jointly developing an electric motor driven Pumpjet propulsor for submarines. It is meant for the upcoming SSNs/SSBNs. BHEL has experience developing & deploying 20MW motors. That & the pumpjet R&D work done for the Shakti torpedo will prove critical here.
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To understand the context interms of adaptability of different types of missiles, both ballistic and cruise. All IN/DRDO will require is to design different adaptors for different missiles or combination of missiles as per mission requirements which will fit into arihant silo shown below. Plus reusing or deriving from Arihant silo will cut costs, complexity and time.
Let me drop a hint if one is looking for a rough idea of future SSN, take scorpene as a kind of indirect base very loosely. SSBN will also loosely have the same hydrodynamic features more or less lower body.
This pic is based on is a old scale test model. The actual SSBN will have a blended hump and a streamlined body. Don't believe, no problem. Anyways sometime back india established a 3d virtual reality interactive design center for submarine and ships, of the sort used by french naval group like the one below.
If you note the model , you will notice it is a two piece arrangement
First is the lower body ( main body ).
Second is the upper body ( hump and mast ).
This means upper body is interchangeable in the model for testing out different configurations of the same. And thus it is safe to imply that the model released is most probably a discarded early test model. Till today we don't have a clear pic of arihant, so what are the chances that they will release the confirmed model of a SSBN Zero.
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And the SSN will have a 1.5 Hull configure. Cant confirm it totally but can say it could have a much higher chances.