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Marine Auxiliary Machinery

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Marine Auxiliary Machinery Chapter 8 Lesson1 Rudder Arrangement Learning Objectives Know the parameters essential for the size of the steering gear. – PowerPoint PPT presentation

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Title: Marine Auxiliary Machinery


1
Marine Auxiliary Machinery
  • Chapter 8 Lesson1
  • Rudder Arrangement

2
Learning Objectives
  • Know the parameters essential for the size of the
    steering gear.
  • Be able to explain how the bearing forces act
  • Know the principles of the most used rudder
    arrangements.

3
Rudder Torque
  • In order to move the rudder, the steering gear
    has to create a certain torque (measured in kilo
    Newton)
  • The torque requirement is given by the class
    rules to ensure safe maneuverability of the
    vessel. The size and also the speed of the vessel
    is taken into consideration.

4
Rudder Forces
  • The rudder arrangement is also exposed to these
    forces
  • Current forces created by propeller and waves
  • Gravity of components and ship movement
  • Side forces when turning
  • The forces depend upon the type and size of
    rudder and also the rudder arrangement.

5
Spade rudder
  • This is the most used rudder type on ferries and
    smaller boats. This type of rudder gives very
    good manoeuvrability, depending on the available
    rudder angle and the rudder profile.

6
Half Speed Rudder
  • This type of rudder is most commonly used on big
    vessel.This rudder is not spade rudder of the
    same size.

7
Flap Rudder
  • This type of rudder is used when very good
    manoeuvrability is required. The rear fin
    exaggerates the movement of the rudder, making
    the rudder more effective. (increasing the side
    lift)

8
Assessment Test
  • Question 1 of 3
  • The water flow creates?
  • A) Vertical forces on the rudder
  • B) Side forces on the rudder
  • C) Both vertical and side forces
  • D)I dont know

9
Assessment Test
  • Question 2 of 3
  • What are the parameters most essential for the
    rudder torque?
  • A) Shape of the hill, propeller rotation and
    waves
  • B) Rudder arrangement, size of the rudder and the
    vessels speed
  • C) The vessels dead weight and tonnage
  • D) I dont know

10
Assessment Test
  • Question 3 of 3
  • Which one of these three rudders gives the best
    manoeuvrability, given they have the same size?
  • A) Spade rudder with normal profile
  • B) Semi-spade rudder
  • C) Flap rudder
  • D) I dont know
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