srai wrote:
D Roy wrote:
These are the "Janta" class...The ships shall have Diesel propulsion with Water Jets...To operate within 200 NM of the base port...[b](c) Weapons (a) ASW Combat Suite (i) Hull Mounted Sonar (HMS) (ii) 2x Indigenous Torpedo Launcher (Three light weight torpedo tubes per launcher in pyramid configuration) (iii) 1x Indigenous Rocket Launcher (v) Low Freq Variable Depth Sonar(LFVDS)
I’m not sure why members are calling it Janta class.
Let us understand DE submarines like Pakistani Agosta and Chinese EKM877 copies
They travel 10 knots on surface, 20 knots submerged just under the surface using diesel engines and snorkel, and 4-6 knots truly submerged using batteries. Range in the last mode is barely 300-500 nm before batteries need to be recharged.
So a DE submarine sprints and ambushes. In 1971, the PNS Hangor had multiple ambush zones on the West Coast of India. She was first off Bombay, but when the main fleet departed, she moved off Gujarat coast with the (correct) assumption that the Petya and Osa boats would need refueling there, where she encountered Kukhri and Kirpan.
http://indiannavy.nic.in/t2t2e/Trans2Tr ... ps_enc.htmQuote:
The following four signals recovered from the GHAZI have been reproduced in Admiral Krishnan's book:
DTG 221720 NOV 71
FM : COMSUBS
TO :SUBRON-5
INFO : PAK NAVY
-----------------------------------------------------
FOLLOWING AREAS OCCUPIED.
1. PAPA ONE, TWO, THREE, FOUR.
2. PAPA FIVE, SIX, SEVEN, EIGHT.
3. BRAVO ONE, TWO, THREE, FOUR, FIVE, SIX
4. MIKE.
--------------------------------------------------------
Bravo Zones were seas around Bombay. Mike Madras Victor Vizag
It is very difficult for a DE submarine to chase a fleet at high seas because it simply cannot keep up. During WW2, German U Boats set up ambush zones in the Atlantic guided by HQ. However, they simply didn’t have the endurance to chase convoys.
Now the Janta class with patrol exactly these areas where submarine ambushes are expected.
1. Janta class is Water Jet propelled, so will have high speeds of 35 knots & short reaction time and will be able to sprint to areas wherever enemy submarines have been detected. Same water jets powering TFTA LCS.
2. It will have greater endurance than ASW helicopters that need to depart after X hours and MPA that need to depart after XX hours.
3. Janta class will be low cost, enabling greater numbers to be built.
4. A submarine commander will pause before firing an expensive DM2A4 torpedo at a cheap Janta class.
5. Janta class with its high speed can maintain a safe separation distance from any enemy torpedo
6. Full sensor suite
7. Even the latest ASW HWT at 50 knots gives an enemy submarine enough time to detect and launch countermeasures to seduce torpedoes away. Janta class will race in at 35 knots atop the enemy submarine and blast it with RPK-8 system that cannot be jammed. Or it can launch TAL at close ranges giving enemy submarine lesser time to react.
Janta class, like the Gurkha and his Kukhri, packs a lot of punch in a small package. Call it Gurkha class.