What type of propulsor is typically used in electric motor driven, transverse, tunnel bow thrusters to limit the starting current of the single speed drive motor?
• Bow thruster design and how thrust is controlled in a tunnel thruster • Difference between fixed-pitch vs controllable-pitch propellers in terms of starting load on the motor • How electric motor starting current is affected by starting torque and load
• Think about what happens to an electric motor’s current draw when it tries to start under full propeller load versus a reduced load • Consider which type of propulsor allows you to adjust or reduce the hydrodynamic load on the blades at the moment of starting • Ask yourself: which option is commonly associated with tunnel thrusters on larger ships where electrical load management is critical?
• Verify which propulsor type can change blade pitch without changing RPM, allowing low-load start and then increased thrust • Confirm which types listed are basically just different constructions of a fixed-pitch propeller and therefore do NOT reduce starting load • Make sure the option you choose is actually used in tunnel bow thrusters and not primarily in specialized propulsion systems like Voith-Schneider or main propulsion wheels
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