FLENDER Single Input/Single Output Marine Gearboxes


Single input/single output marine gearboxes are used in river boats and coastal vessels, but also in ocean-going vessels. Depending on the application they can be built with vertically, horizontally or diagonally offset shafts. These gearboxes cover a power range from 1,000 to 30,000 kW with transmission ratios from 1.5 to about 12.1. 

These gearboxes can optionally be supplied with or without built-in multiple disk clutch.

Using a PTO (Power Take Off), on-board electricity can be produced with a generator. Here, a variety of solutions is available to our customers.  For example, the generators can be driven via a primary or secondary PTO.  Special solutions such as PTI (Power Take In) or PTH (Power Take Home) are also possible, as are switchable or two-stage PTOs.  To adjust the propeller speed in PTH operation, Siemens provides a switchable PTO with two different transmission ratios. 

Technical data

Power rating

from 1,000 to 30,000 kW


from 1.5 to 12.1

Nominal torque

up to 600,000 Nm


Primary or secondary


Multi-stage, switchable


  • Minimum noise generation

  • Very low vibration

  • Highest efficiency

  • Optimum power/weight ratio

  • Worldwide service


  • Single-engine ships

  • (Two-gear) PTO, PTH