Manoeuvring Data Dialog - General Tab
- Last UpdatedDec 18, 2025
- 3 minute read
Title
The node title may be modified via this tab sheet.
Ship Type
Two different mathematical models have been developed for Merchant and Naval vessels (see Manoeuvring Module). You should choose the vessel type here.
Note:
Shallow water corrections are only available for Merchant vessels. Also, the rudder
type chosen on the Appendages dialogs (Rudders tab) is only applicable to Naval vessels, with Merchant vessels assuming
a conventional rudder.
Loading Condition
All of the manoeuvring calculations require various hydrostatic data as input to the regression formulae.
A loading condition previously defined within Hydrostatics may be selected, thus using the hydrostatic properties of the vessel, as calculated by Hydrostatics. Alternatively, you may enter any draught, and indeed any hydrostatic properties. However, the facility to automatically calculate the hydrostatics from the vessel, at any draught, has been implemented.
The grid control has been designed so that information can be copied and pasted with ease
The following is a brief description of each item in the grid control:
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Condition |
By default, a User Defined condition is created, that is, it is independent of the Loading Conditions previously set up in Hydrostatics. However, each loading condition is included in the drop-down list, allowing you to easily perform manoeuvring calculations on predefined loading conditions. Note that if a defined loading condition is selected, then you may not change the Name, Draughts or fields calculated automatically. |
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Automatic Update |
Checking this button will automatically update certain fields by calculating the properties from the hull definition. The following values are calculated:
This item is only available for a User Defined condition, and if it is checked, and you change either the Draft Aft of Draft Fwd, then values are again automatically updated on the fly. Note: |
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Name |
Condition Name |
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Draft Aft |
The draught at the aft perpendicular. Note: |
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Draft Fwd |
The draught at the forward perpendicular. Note: |
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Mean Draft |
The draught at midships. Not editable. |
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Trim |
Trim by the bow (Tf-Ta). Not editable. |
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Include Bulb |
The manoeuvring calculations use either a modified Holtrop & Mennen or Series60 formulation for calculating the vessel resistance. They make certain assumptions about the size of a bulb, therefore you are only requested to state whether or not a bulb exists. Check this box if a bulb does exist. |
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CB |
Block coefficient = |
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CM |
Midship area coefficient |
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GM |
Fluid Metacentric height. |
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LCG |
Longitudinal center of gravity from the Aft Perpendicular. |
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VCG |
Vertical center of gravity (from the keel). |
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Rudder to load waterline |
Distance of the rudder to the load waterline. |
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