View of the azipods of the USCGC Mackinaw
Closeup of an azipod on USGCC Mackinac

Ships have special needs for propulsion.

  • conventional propulsion system – a large two stroke engine is connected to a shaft, which passes through shaft tunnel and stern tube and connects to the propeller outside the hull in the aft part of the ship. The steering of such system is done with the help of a rudder placed in the aft of the propeller.
  • Azipod Propulsion System – used on ships is combination of both propulsion and steering systems. In azipod arrangement, the propulsion and steering systems are combined and made into one part. The system consists of a propeller which is driven by an electrical motor and the propeller is turned by the rudder which is connected to the system.

That’s engineering

  • propulsion – the use of force to make movement.
  • water propulsion – pole, paddle, oar and sail have been used. The most common types are underwater propellers.
  • propeller makes ship or submarine go in water by making a strong stream. The blades of a propeller act as rotating wings, and produce force through application of both Bernoulli’s principle and Newton’s third law, generating a difference in pressure between the forward and rear surfaces of the blades.

Engineering ideas

  • propulsion, two-stroke engine, shaft, propeller, hull, stern, rudder, steering, electrical motor, drive, force, pressure difference, blade, surface

Learn more…