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Foxtrot vs Permit

Foxtrot submarine side profile drawing
🇷🇺 Foxtrot
Change comparison vs
Specifications
Foxtrot Permit
Origin 🇷🇺 Ex-USSR 🇺🇸 United States
Category Submarine Submarine
Type Diesel-electric submarine Nuclear-powered attack submarine
Manufacturer Sudomekh Portsmouth Naval Shipyard
Year introduced 1958 1961
Number built 75 units 14 units
Estimated unit price NA NA
Displacement 1,983 tons 3,810 tons
Maximum speed 16.0 knots 15.0 knots
Range 20,000 nm at 8 knots Unlimited
Length 89.9 m 84.9 m
Beam 7.4 m 9.6 m
Crew 78 112
Max depth 296 m 400 m
Performance Radar Chart
Armament & Systems
Foxtrot Permit
Armament
  • 10 x torpedo tubes (6 bow, 4 stern)
  • 22 torpedoes
  • 4 × 21 inch (533 mm) torpedo tubes amidships
  • 12-18 × Mark 37 torpedoes (later Mark 48s)
  • 4-6 × UUM-44 SUBROC anti-submarine missiles
  • 4 × UGM-84 Harpoon anti-ship missiles
Propulsion 3 × Kolomna 2D42M 2,000 hp (1,500 kW) diesel engines; 3 × Electric motors (two 1,350 hp and one 2,700 hp); 1 × 180 hp auxiliary motor; 3 shafts 1 S5W PWR, 2 steam turbines, 15,000 shp (11 MW), 1 shaft

Overview

The Foxtrot and the Permit are both Submarine classes.

Displacement is 1,983 tons for the Foxtrot vs 3,810 tons for the Permit. The Foxtrot reaches 16 knots vs 15 knots for the Permit. Operational range is 20,000 nautical miles for the Foxtrot vs 99,999 for the Permit. The Foxtrot carries a crew of 78 vs 112 for the Permit. Submerged displacement is 2,515 tons for the Foxtrot vs 4,369 tons for the Permit. The Permit can dive to 400 m compared to 296 m for the Foxtrot.

The Foxtrot was produced in 75 units vs 14 for the Permit. The Foxtrot was commissioned in 1958, 3 years before the Permit (1961).

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Frequently Asked Questions

Which has greater displacement, the Foxtrot-class or Permit-class?
The Permit-class has greater displacement at 3,810 tons compared to the Foxtrot-class's 1,983 tons.
Which is faster, the Foxtrot-class or Permit-class?
The Foxtrot-class is faster with a maximum speed of 16 knots compared to the Permit-class's 15 knots.
Which has longer range, the Foxtrot-class or Permit-class?
The Permit-class is nuclear-powered with unlimited range, while the Foxtrot-class has a range of 20,000 nautical miles.
Which is longer, the Foxtrot-class or Permit-class?
The Foxtrot-class is longer at 89.9 meters compared to the Permit-class's 84.9 meters.
How many crew members do the Foxtrot-class and Permit-class have?
The Permit-class has a larger crew complement of 112 compared to the Foxtrot-class's 78 crew members.
Which can dive deeper, the Foxtrot-class or Permit-class?
The Permit-class can dive deeper with a maximum depth of 400 meters compared to the Foxtrot-class's 296 meters.
Which has been built in greater numbers, the Foxtrot-class or Permit-class?
The Foxtrot-class has been built in greater numbers with 75 vessels compared to 14 vessels of the Permit-class.