Indian Sonar and Torpedo developments

Video of Shivalik class frigate firing ALWT. So ALWT's are being inducted into surface ships. You can also see a Shyena torpedo being fired too.
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Indeginous SONAR for ASWSWC

If everything goes well, 3-4 years till LSP production order. Meanwhile, 10 SSKs sharing ~50 or so torpedos from 90s.
NSTL also had some sow for some torpedo testing on ship that could emulate submarine condition, I forgot if it were for the lightweight torpedo or this. All signs are pointing towards weapons systems being ready for extensive testing, then large production.

Edit: this was supposed to quote Chain smokers reply. :D
A photo of the Varunastra HWT from late 2021:
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A photo of Varunastra HWT from mid-2023:
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The 2021 photo shows 2 rows of 6-bladed contra-rotating open screw type propulsion set up. The newer photo shows a pumpjet propulsion set up. Finally, they have managed to make the transition towards a pumpjet. It seems the recent torpedo test was conducted to verify this propulsion set up.

DRDO's 1st HWT project was the Shakti thermal torpedo project which would have had a 400-500 KW power & would run at 55-60 knots.
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As with many ab-initio projects, DRDO at that time failed to meet the Navy's QRs & this project was killed. But the tech developed for that project lives on.

It was DRDO's 1st attempt at making pumpjets & thus we got to see a lot of different configurations in terms of no. of blades, size/position of blades, blade geometry etc.
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At that time this was the configuration that they eventually settled on.
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The Varunastra is an electric torpedo as opposed to the Shakti. The Navy has decided against thermal torpedoes as they are prone to inadvertent detonation & can cause catastrophic damage in case of an accident.

The downside of this decision is that making a 400-500 KW battery for a torpedo is not an easy task. The current Ag-O-Zn battery is rated 250 KW & is being upgraded to 300 KW. Even with a 300 KW battery, the 1.5-ton Varunastra HWT can't be propelled faster than 48-50 knots. It would be equivalent to the French F21 torpedo but still somewhat inferior to the Mark 48 torpedo.

Still there are advantages the pumpjet will bring. Reduced acoustic signature, higher range & speed, increased maximum operating depth. But to fully exploit the advantages of the pumpjet the battery has to be at least 400 KW. That would bring the Varunastra on par with the Mark 48 in performance.

Also good on the Navy for purchasing 130+ torpedoes before all the incremental improvements came about. The Navy wanted a F21 equivalent but settled for something inferior for the time being. This provided the DRDO time, funding & user feedback to continue development of the torpedo. This is how projects need to be run.
1703348642685.png the upgrade to pump jet propulsion & the new battery was a part of the submarine acceptance trials. Varunastra HWT is now submarine compatible.
That's not the worst part. They block import for a never coming Indian sonar and navy continue to be handicapped.

Import should be done when it's needed.
6 towed array sonars have been imported from Atlas Elektronik - have more been imported?