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Nilgiri vs Sigma

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Specifications
Nilgiri Sigma
Origin 🇮🇳 India 🇳🇱 Netherlands
Category Frigate Frigate
Type Guided-missile frigate Multi-purpose corvette / frigate
Manufacturer Mazagon Dock Shipbuilders, Garden Reach Shipbuilders & Engineers Damen Schelde Naval Shipbuilding
Year introduced 2025 2007
Number built 7 units 10 units
Estimated unit price $480 million $222 million
Displacement 6,670 tons 1,692 tons
Maximum speed 32.0 knots 28.0 knots
Range 2,500 nm at 28 knots 4,800 nm at 14 knots
Length 149.0 m 90.7 m
Beam 17.8 m 13.0 m
Crew 226 80
Performance Radar Chart
Armament & Systems
Nilgiri Sigma
Armament
  • 8 × BrahMos supersonic cruise missiles (VLS)
  • 32 × Barak-8 (MRSAM) surface-to-air missiles
  • 1 × 76 mm Oto Melara SRGM
  • 2 × AK-630M CIWS
  • 2 × 3 324 mm torpedo launchers
  • 2 × RBU-6000 anti-submarine rocket launchers
  • 1 × Oto Melara 76 mm gun
  • 2 × 20 mm Denel GI-2 gun
  • 2 × quad (8) Mistral TETRAL Anti-air missile
  • 4 × Exocet MM40 Block II/MM40 Block III anti-surface missile
  • 2 × B515/3 triple launchers for lightweight WASS A244-S mod.3 / EuroTorp MU 90 torpedoes
Propulsion CODOG: 2 × GE LM2500+ gas turbines + 2 diesels, 2 shafts 2 × SEMT Pielstick 20PA6B STC rated at 8910 kW each driving a lightweight Geislinger coupling; 4 × Caterpillar 3406C TA generator rated at 350 kW each; 1 × Caterpillar 3304B emergency generator rated at 105 kW; 2 × shaft with Rolls-Royce Kamewa 5 bladed controllable pitch propeller

Overview

The Nilgiri and the Sigma are both Frigate classes.

The Nilgiri displaces 6,670 tons — 3.9x the Sigma's 1,692 tons. The Nilgiri reaches 32 knots vs 28 knots for the Sigma. Operational range is 2,500 nautical miles for the Nilgiri vs 4,800 for the Sigma. The Nilgiri carries a crew of 226 vs 80 for the Sigma.

The Nilgiri was produced in 7 units vs 10 for the Sigma. Cost per hull is $480M for the Nilgiri vs $222M for the Sigma. The Nilgiri was commissioned in 2025, 18 years after the Sigma (2007).

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Frequently Asked Questions

Which has greater displacement, the Nilgiri-class or Sigma-class?
The Nilgiri-class has greater displacement at 6,670 tons compared to the Sigma-class's 1,692 tons.
Which is faster, the Nilgiri-class or Sigma-class?
The Nilgiri-class is faster with a maximum speed of 32 knots compared to the Sigma-class's 28 knots.
Which has longer range, the Nilgiri-class or Sigma-class?
The Sigma-class has a longer range at 4,800 nautical miles compared to the Nilgiri-class's 2,500 nautical miles.
Which is longer, the Nilgiri-class or Sigma-class?
The Nilgiri-class is longer at 149.0 meters compared to the Sigma-class's 90.7 meters.
How many crew members do the Nilgiri-class and Sigma-class have?
The Nilgiri-class has a larger crew complement of 226 compared to the Sigma-class's 80 crew members.
Which is more expensive, the Nilgiri-class or Sigma-class?
The Nilgiri-class is more expensive at approximately $480 million per unit compared to the Sigma-class at $222 million.
Which has been built in greater numbers, the Nilgiri-class or Sigma-class?
The Sigma-class has been built in greater numbers with 10 vessels compared to 7 vessels of the Nilgiri-class.