General HydroStatics
Ship Stability Software
Command of the Week
(New or interesting aspects of GHS that you may not know about)

The Deepest Point


GHS is known for the application of commands in creative or unexpected ways. Recently, a good example of this arose from a relatively simple request: how to find the deepest point on a vessel with non-zero heel and trim?

For those who conjecture that there always exists some combination of macros which will provide a solution to any problem, we salute your can-do attitude: you are a programmer at heart. In this case, however, ground points actually offer a less laborious solution, despite that you may not be interested in modeling a grounding scenario at all.

Thanks to the algorithm employed by the GROUND /FLOOR command, you can very easily identify the deepest point on a hull component in a given condition by simply limiting the /NPoints parameter to 1 and setting an arbitrary /FLOOR depth. More than one hull component you say? No problem, just issue a single-pointed GROUND /FLOOR command for each component and then select the point with the deepest depth (in this case 7.45 feet to the skeg).

read fv.gf

he 5
tr 3
dr 6
so we lcg tcg

`di status profile, plan:be /sync

ground (hull\hull.c) /floor:10 /npoints:1
ground (hull\skeg.c) /floor:10 /npoints:1

report
ground report
`st gr:all
report close /preview


But, given our profession, we also wrote a macro using the WPA and origin DEPTH system variables. It luckily returned the same result. The conjecture still stands, but its proof remains elusive. Find the run file here.

Questions, comments, or requests?
Contact Creative Systems, Inc.

support@ghsport.com

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

www.ghsport.com

Click here for an index to this and previous COWs