Manoeuvring Data - Propeller Data
- Last UpdatedDec 18, 2025
- 1 minute read
All of the manoeuvring calculations require the input of propeller information, namely the number of propellers, number of blades and diameter.
In addition, the mean pitch and blade area ratio are also required.
If you have previously run a set of powering calculations, then these values may be taken from the optimum propeller values, calculated for the design condition.
Alternatively, you may supply his own values. If however, powering calculations have not been performed, then the input of user specified values is mandatory.
Depending on ship type as specified on the Main Particulars dialog, the following limits are applied to the input data:
|
Minimum Value |
Maximum Value |
||
|---|---|---|---|
|
Limits for Naval Ships |
|||
|
No. of Propellers |
1 |
2 |
|
|
Propeller Diameter |
- |
0.7*(Mean Draft+Trim) |
|
|
Pitch/Diameter |
0.50 |
||
|
No. of Blades |
2 |
1.40 |
|
|
Blade Area Ratio |
0.30 |
1.05 |
|
|
Limits for Merchant Ships |
|||
|
Number of Propellers |
1 |
4 |
|
|
No. of Blades |
3 |
5 |
|
Checks on the limits of the input information are carried out upon initiating the manoeuvring calculations.