SCHOTTEL TransverseThruster

Robust, durable, user friendly – the SCHOTTEL TransverseThruster improves manoeuvring performance in vessels of all types and sizes. The STT’s area of operation ranges from short docking and casting off in ports with only a few operating hours per year to continuous operation and the highest loads in demanding offshore applications with dynamic positioning.


At a glance

  • Maximum thrust
  • Compact design
  • Less maintenance required due to its robust, high-quality design
  • SCHOTTEL-exclusive features such as LeaCon or HTG (optional)
  • Well installation for easy access to the propulsion unit (optional)
  • Elastically mounted installation for lower noise levels (optional)


Maximum thrust for maximum manoeuvrability

A crucial factor for the STT is thrust. This is why SCHOTTEL attaches great importance to an optimal propeller design, which is customized to the respective vessel geometry. For example, the clearance between tunnel and propeller is an important parameter for the efficiency of the propulsion unit; this clearance has been reduced to a minimum for all STT types.

This effectively results in greater thrust. On request, special requirements regarding noise levels can be taken into account, e.g. a resiliently mounted installation.

Technical data

STT in numbers


Special advantages of SCHOTTEL

In addition to developing new products and services, SCHOTTEL works continuously to optimize existing systems. Special features ensure that customers worldwide benefit from state-of-the-art solutions.

HTG: innovative High Torque Gear

SCHOTTEL’s self-developed High Torque Gear (HTG) extends the service life of the gearbox, resulting in significant performance and safety gains. State-of-the-art milling and calculation methods are used to achieve shapes that enable a highly efficient, robust and safe gearbox with ideal gear geometry.

The HTG allows for example up to 15 percent more drive torque to be applied with the same bevel gear dimensions and in compliance with the same safety requirements of the classification societies.

LeaCon: reliable seal monitoring system

SCHOTTEL LeaCon is a sealing system certified by DNV which offers safe and reliable protection against contamination of the seawater by operating materials.
Separate seals to the seawater and to the gearbox side ensure that both incoming seawater and escaping gear oil are collected in an intermediate chamber (LeaCon chamber). This effectively prevents water from entering the gearbox and, above all, oil from escaping into the seawater. With the connected vacuum system, the leakage fluid is automatically collected in a compact tank in the engine room.

Continuous monitoring

In addition to the leakage-free sealing against seawater, the LeaCon system is used to monitor the condition of the seals. It registers the amount of leakage collected and continuously checks the condition of the seals. This means that operational wear can be detected at an early stage and unscheduled maintenance can be avoided.

Complies with VGP regulations of the EPA

SCHOTTEL propulsion units equipped with the LeaCon sealing system comply with the VGP regulations of the US-American Environmental Protection Agency (EPA). There is no need to use bio oils (EAL).

Elastic well installation

This installation variant can also be supplied in an elastic version, which ensures a further reduction in noise and vibration levels during operation while enhancing comfort on board.


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