Rim Drive Tunnel Thruster


The Rim Drive Tunnel Thruster is a one of the latest additions to the Kongsberg Maritime family of thrusters, building on a completely new approach to thruster design and motor integration, with low environmental footprint. The RD-TT meets operational requirements with focus on hydrodynamic efficiency, low noise and reliability.

Kongsberg Rim Drive Tunnel Thruster (RD-TT)

Product Main Features

  • Small inboard footprint
  • Electric and Hydrodynamic efficiency
  • Robust design
  • Thruster unit cooled by surrounding seawater, no additional cooling required
  • Efficient and space saving PM technology with high torque density
  • Robust design with few rotating parts
  • Robust centre shaft carries all propeller loads
  • Simplified system design with limited auxiliary equipment
  • Prepared for easy connection to Equipment Health Management (EHM) system

Product Main Benefits

  • Equal thrust in both directions
  • Reduced footprint in thruster room
  • Low level of vibrations and low airborne, structural and hydroacoustic noise (URN)
  • Fast response time (efficient roll-damping)
  • Reduced life cycle cost
  • Reduced installation time of unit
  • Long service intervals
  • Strong operational support


The Rim Drive Tunnel Thruster (RD-TT) has been engineered with reliability and reduced life cycle costs as the focus. Using permanent magnet motor technology increases efficiency and makes the installation more compact, only the variable frequency drive unit is housed in the thruster room, freeing up space on board.

Rim Drive Tunnel Thrusters are currently available in two sizes with powers of 1,000 and 1,600 kW. These thrusters have been developed for the most demanding applications such as dynamic positioning.

Kongsberg Rim Drive Tunnel Thruster (RD-TT)

Kongsberg Rim Drive Tunnel Thruster (RD-TT)
Thruster type RD-TT 1600 RD-TT 2000
Power (kw) 500 – 1000 1000 - 1600
Thrust (kN) 156 kN 243 kN
RPM 340 280
Propeller dia (mm) 1600 2000
Propeller type Monobloc/FP Monobloc/FP
Direction of rotation CW/CCW CW/CCW
Drive AFE or 12 pulse drive AFE or 12 pulse drive

Space saving installation

These two pictures illustrate the significant space savings delivered by PM technology.

Due to its symmetric design the permanent magnet tunnel thruster provides increased flexibility for the ship designer to achieve a more optimal and space-saving installation.

Kongsberg Rim Drive Tunnel Thruster (RD-TT) is formerly known as Permanent Magnet Tunnel Thruster (TT-PM)

Services and support

  • 24/7 Technical support

    Our 24/7 technical support team is there to help at any time, day or night, wherever your vessel is.

  • Conversions, retrofit and refit

    We understand the importance of having the right parts, available in the right place, at the right time.

  • Training

    Ensure that your crew is properly and thoroughly trained. This will reduce operational risk, downtime and maximise return on asset investment.

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