Hey Guys,

I’m studying to further improve my skills and have come across a question I need a little help with.

I have to write a report on compliance against NSCV which is a stability code in Australia for commercial vessels.

I have a stability manual for a vessel including hydrostatic stables, and intact stability for various loaded conditions.

Obviously I’m going to compare the values at their worst (Fully loaded, for departure) when the boat is its heaviest/most loaded for criteria to comply.

I am stuck at a section of the criteria:

[I]All vessels within application, Clause 5.2

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[I]

The area under the righting lever curve between the angles of heel of 30 degrees and 40 degrees, or between 30 degrees and the angle of flooding [FONT=Times New Roman]θf if this angle is less than 40 degrees, shall be not less than 1.72 metre-degrees.

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I do not know what “metre-degrees” is.

Same with m-rad i’m assuming meters-radians but I don’t know what this value means.

As far as I can see, I need to find out the righting lever curve area between 30-40 degrees, as the boat’s angle of flooding is more than 40 degrees, and it must not be less than 1.72metre-degrees.

In the stability manual it has values of area between them e.g

30 degrees heel to port = 0.4548 m-rad

40 degrees heel to port = 0.6294 m-rad

I was thinking along the lines of:

0.6294 - 0.4548 = 0.1746 m-rad

How do I convert this to m-degrees?

I am looking to learn how figure this out rather than just an answer on if it’s compliant.

Am I heading in the right direction? Do you need any further details to answer this?