Dynamic Positioning Data - Rudders Tab
- Last UpdatedDec 18, 2025
- 3 minute read
Rudder information may be set using the page.
General
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Rudder Type |
One of three available rudder types:
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Distance aft of AP |
The distance of the rudder from the aft perpendicular. |
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Separation |
Transverse separation of the rudders. Note: |
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Maximum Rudder Angle |
The maximum angle (in degrees) to which the rudder can turn. |
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Rudder Area |
Area of a single rudder. |
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Aspect Ratio |
Aspect ratio of the rudder(s). |
Pitch/RPM
Propeller pitch and RPM corresponding to ahead and astern maximum thrust for fixed longitudinal propellers adjacent to rudders.
Typical pitch and RPM values for ahead and astern operation are given by
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where D is the propeller diameter and T vessel load draught.
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Dependency
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Independent |
The rudders can act independently of each other. |
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Dependent |
The rudder angles for each rudder are the same. |
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Fixed |
The rudder angle is fixed at zero degrees. |
Lift-Drag Coefficients
Lift-Drag coefficients are required in the calculation of the rudder forces. Default values are available for normal rudders, however, these may be overwritten with User supplied values.
If a Becker or Schilling rudder type is chosen, you must supply their own values.
Note:
Values for Lift and Drag are required at 5 degree intervals. The rudder angle values
are therefore not editable.
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Default |
Default lift and drag coefficients can be obtained for a Normal rudder type. The values are dependent on the aspect ratio. Values are interpolated from the tabulated values below |
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