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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
• 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