MARINE PROPULSION AND STEERING DESIGNS

A. Transverse thrust rudders
Transverse thrust rudders are used as bow thrusters in their traditional form in the bow as an aid to manoeuvring for freighters, ferries, Roll-on/Roll-off ships, dredgers, supply ships etc.

Why TT?
• Ships want to be able to manoeuver in harbours without tug assistance
• Operating in harbours with the thruster inside the ship is not sensitive to damage
• Power and size of the thruster depends on the lateral area of the ship and the intended operation
• Maneuvering aid or DP operation is important for the selection
Application Examples:
• Bulk carriers
• Cargo vessels
• Container vessels
• Cruise
• Defence
• Ferries
• Fishing
• Offshore vessels
• Service vessels
• Tankers


B. Manoeuvring propellers
Manoeuvring propellers are used as main drive units for tugs, freighters, floating cranes, dredgers, research vessels and for all sorts of offshore equipment.

C. Rudder propellers
Rudder propellers are preferably used where it is required to install an engine in a simple vessel at a later date, or where there is no room for an engine compartment, or where the greatest possible use of cargo space is wanted.
They are furthermore used on floating cranes and on working pontoons but also as main drive units for inland waterway vessels.

D. Rudder rotor
Depending on the vessel the rotor rotation characteristics can be programmed and electronically fixed for the rudder rotor according to propeller speed, speed of the vessel and rudder angle.
The rudder rotor is used wherever great rudderforces are needed--particularly when travelling slowly. An important field of application are large vessels such as tankers, bulk carriers, fast large container ships etc. on which the rudder blade cannot be designed to an optimum because of the excessive size of the vessel or high speed.

E. Azimuth Jets
Azimuth Jets installations are used in drilling ships, research vessels, pipe-laying vessels, ships for extracting raw materials from the seabed and for all other special vessels or platforms which have to maintain a fixed position without the use of anchors.

CAPT PAX SANCHEZ
PMMAGS (MMET)