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General HydroStatics
Ship Stability Software |
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Command of the Week
(New or interesting aspects of GHS that you may not know about) |
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LIMIT FLOODHT
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To check whether a vessel is operating within the limits imposed by stability criteria,
GHS looks at certain properties of the righting-arm curve. Depending on the
particulars of the criterion, it may evaluate things like range of stability, energy in that range,
angle to downflooding, etc. The command that establishes numerical min/max limits on these
properties is the LIMIT command.
A standard question everyone wants to know the answer to is how high the center of gravity can be and still meet stability requirements. Say at a given displacement, what is the highest VCG that passes all the limits? There are cases with certain ships and certain criteria where surprising things happen as the VCG is raised. For example, the angle of trim might increase and immerse a weathertight point even at zero heel. The highest VCG in that case could pass all the limits in the criterion by a wide margin but fail when it is raised just a bit more. John Bonn ran into one of these, and he found a clever way to fix it by adding LIMIT FLOODHT to his other limits. Click here to get his explanation which he was glad to pass on (and we hope he likes his new GHS baseball cap). |
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Questions, comments, or requests?
Contact Creative Systems, Inc. USA phone: 360-385-6212 Fax: 360-385-6213 Office hours: 7:00 am - 4:00 pm Pacific Time, Monday - Friday Mailing address: PO Box 1910 Port Townsend, WA 98368 USA Click here for an index to this and previous COWs |