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TTH Tunnel Thruster

Power and precision from a new generation of Tunnel Thrusters

Performance and design flexibility, engineered for various marine applications

Tunnel Thruster type TTH

The TTH Tunnel Thruster represents the next generation of our proven tunnel thruster technology. 

Kongsberg Maritime Tunnel thruster unit type TTH
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Backed by over 60 years of hydrodynamic expertise, the Harmonised (H) range is designed to deliver compact, flexible, and installation-friendly propulsion performance for vessels operating in complex environments — from offshore platforms to naval operations.

Available in two propeller diameters — 1650mm and 1850mm — with power up to 1250kW, the TTH is optimised for Dynamic Positioning (DP) and Auxiliary (Aux) propulsion applications.

Key features

Kongsberg Maritime Tunnel thruster unit type TTH

  • Compact thruster design: Shorter build length enables forward/aft hull placement, improving DP performance and vessel design flexibility.
  • Modular design: One core unit fits multiple propeller sizes, simplifying spares and enabling easier upgrades.
  • Enhanced design: Increased clearance between propeller blade tip and tunnel plating, simplifying thruster installation within the tunnel, minimising paint erosion and lowering noise and vibration levels.
  • Backward compatible: interchangeable with existing Kongsberg type TT units
  • EHM-ready: Equipment Health Monitoring (EHM)-compatible.
  • Propeller options: Controllable Pitch (CP) or Fixed Pitch (FP)
  • Ice-class certified: Built for Baltic operations, approved for Polar Class 6 and 7.

Performance benefits

Technical data

Thruster Type Propeller Diameter (mm) Propeller Type Max Power (kW
TTH 1650 CP / FP 1091
TTH 1850 CP / FP 1250

Customisation options

  • Custom Tunnel: Tunnel length and additional reinforcement ribs and rings can be adjusted according to customer requirements.
  • Super Silent (SS) Tunnel: Double-walled, flexible mounted design provides noise reduction up to 15 dB compared to standard designs. Ideal for cruise, research and sensitive offshore environments.
  • Trunk-Mounted (TM) Configuration: Enables full maintenance access without dry-docking, reducing operational downtime. Suitable for vessels requiring maximum service flexibility.
Kongsberg Maritime Tunnel thruster unit type TTH

Global thruster support

Kongsberg Maritime provides 24/7 global support across 32 countries, ensuring fast access to expert assistance wherever your vessel operates.

  • Minimise downtime with ready-to-install refurbished units. TSP reduces service time from 21 days to as little as 4–7 days — with fixed pricing, OEM warranty, and full classification.

    Thruster Support Pool (TSP)

  • From installation to upgrades, we offer spare parts, onboard training, condition monitoring, and maintenance tailored to your vessel and mission profile.

    End-to-end lifecycle services

  • Move from reactive to Condition-based maintenance and increase equipment reliability, decrease unplanned downtime, and reduce Opex.

    Condition Monitoring Solutions

  • Improve operational predictability and maintenance planning with our expert support.

    Health Management Service

Design for

  • Offshore Oil & Gas Platforms
  • Offshore Wind Installation and Service Vessels
  • Marine Transportation (Cargo & Passenger)
  • Research Vessels
  • Workboats
  • Naval and Coast Guard Fleets
  • Cruise and Ferry Operators
Kongsberg Maritime Tunnel thruster unit type TTH

Ready to upgrade your propulsion?

Get in touch with our thruster specialists to configure the TTH solution that best fits your vessel’s operational needs and lifecycle strategy.

Lifecycle support for your vessel

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