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Construction
| Model Testing | Command and Control | Profile | Propulsion | Accommodations |
Propulsion
USCGC MACKINAW (WLBB-30) is equipped with two ABB Azipods® for propulsion. The Azipods® are azimuthing electric podded propulsion units capable of unlimited 360 degree steering. Because of this the need for rudders is eliminated. The pods contain an AC electrical drive motor coupled to a short drive shaft connected to a fixed pitch propeller. This eliminates the need for any mechanical gearing.
This choice of propulsion system was based on the performance of Azipod® propulsion systems on other icebreakers around the world. Additionally, ice model testing of MACKINAW with Azipods® demonstrated a significant increase in maneuverability, in ice and open water, over the traditional fixed shaft, propeller and rudder arrangement.
The Azipods® are installed in heavy structural foundations and are rotated using hydraulic motors and gearing. A slip ring is used to transmit power and data. The smooth transmission of torque provided by this AC/AC drive system and the elimination of rudders are beneficial in icebreaking operations.
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