Indian Nuclear Attack Submarine (Project 77) - Updates & Discussions

This part of @Parthu's recent article stuck with me:


So, I made a chart of power to weight ratios of all IN subs (present & future):
View attachment 39463
Figures marked with a Tilda (~) are my guesstimates. Don't take those numbers literally.

You are right P77 should enjoy a major advantage, even if we were to assume P77 would be 9800 tons submerged.
Great job. Thank you for all the hardwork.
 
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Well that hstt facility is where they test the hydrodynamic models of the ships and subs ? All the current batch and cleared upcoming batch ship models were studied there ? that towing tank facility could test models up to 3.3m/sec astern speed with the existing towing mechanism, max prob 4m/sec. They upgraded hstt speed to 7m/sec and the higher weight model towing mechanism this year so obviously in mind to test new gen of ship/sub models there?
 
This part of @Parthu's recent article stuck with me:


So, I made a chart of power to weight ratios of all IN subs (present & future):
View attachment 39463
Figures marked with a Tilda (~) are my guesstimates. Don't take those numbers literally.

You are right P77 should enjoy a major advantage, even if we were to assume P77 would be 9800 tons submerged.

Excellent job!

47 knots for P77? Where is that figure from?

P.S. Do look into including Chinese/Western SSNs for comparison in a v.2
 
47 knots for P77? Where is that figure from?
Just a linear progression based on the Arihant's & the P77's power to weight ratio. Not to be taken literally.
P.S. Do look into including Chinese/Western SSNs for comparison in a v.2
I was thinking the same.

I was thinking Virginia, Astute, Suffren, Yasen, Type 93.
 
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P.S. Do look into including Chinese/Western SSNs for comparison in a v.2
Again, the usual disclaimer, Figures marked with a Tilda (~) are my guesstimates. Don't take those numbers literally.
P77 vs. global SSNs.jpg
P77's power to weight ratio is suspiciously close to the French Suffren. Maybe the increasingly frequent exercises with the Suffren class aren't for nothing. If the P77's hull has a similar co-efficient of friction as the Suffren, then the P77's handling characteristics would be somewhat similar to the Suffren.

There is a dearth of data regarding Chinese sub's reactor & propulsion. So, almost everything is an estimate.
 
Again, the usual disclaimer, Figures marked with a Tilda (~) are my guesstimates. Don't take those numbers literally.
View attachment 39738
P77's power to weight ratio is suspiciously close to the French Suffren. Maybe the increasingly frequent exercises with the Suffren class aren't for nothing. If the P77's hull has a similar co-efficient of friction as the Suffren, then the P77's handling characteristics would be somewhat similar to the Suffren.

There is a dearth of data regarding Chinese sub's reactor & propulsion. So, almost everything is an estimate.

The 093 has 2 x of those reactors. So 150 MWth total.
 
47 knots for P77? Where is that figure from?
at this speed a sub is totally blind, and make so many noise that it's as a bright light in the night. Exactly the contrary of what is searched.
Except to excape a torpedo coming from the back is it usefull? big doubt.

About the supposed 45 knots for Suffren, first time I read such data. We usually read 25+ knots. Reality may more probably be in the 30 to 30+ knots. With nearly same results about stealth and sonar efficience.
The max usefull speed for sonar is in the 20 knots range. Maybe less.
 
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https://****/exclusive-s5-class-ssbn-reactor-upgrades-hint-at-increased-power-beyond-190mw/

220 MWth reactor baby....... 190 MWth while good not enough. Almost all current & future SSBN have 200 + MWth reactor.
 
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Leading Navies are switching to titanium castings, a strategic choice for reliability and cost-effectiveness reasons - Naval News

I made a post long time back that using titanium alloys in building submarine has massive benefits from cost saving, maintenance & increase in sub performance...... Technology has come a long way since cold war. India has good reserves of titanium, our SSN & SSK can benefit massively from a different design approach.
You know that most of the super-alloys and titanium stuff Midhani produce, the raw materials are all imported ? There is very little material extraction and production happen within the country and even the few can not compete market price wise , and this is before China 's dumping habit which has happened fair few times recently.
 
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You know that most of the super-alloys and titanium stuff Midhani produce, the raw materials are all imported ? There is very little material extraction and production happen within the country and even the few can not compete market price wise , and this is before China 's dumping habit which has happened fair few times recently.

Than one need to ponder why that's the case.... Nothing wrong with importing raw material though, making sufficient reserve for bad times can do the trick + submarine once build stays for decades..... Long enough time to go Swadeshi.
 
Leading Navies are switching to titanium castings, a strategic choice for reliability and cost-effectiveness reasons - Naval News

I made a post long time back that using titanium alloys in building submarine has massive benefits from cost saving, maintenance & increase in sub performance...... Technology has come a long way since cold war. India has good reserves of titanium, our SSN & SSK can benefit massively from a different design approach.
But what about the price ? Is it so easy to find so many Titanium to built some subs? USSR tried, and stopped.

airliner and engine builders struggle to find titanium, so....