ship design help

[anth]

hello, i am currently a engineering student and doing a tutorial on tanker design using maxsurf and hydromax. We are giving the following info:

Waterline length: 310 m
beam: 51 m
design draft: 18.5 m
displacement at design draft: 251,800 tonnes

- at ballast condition, the draft is 11m and KG is 12m.
- at fully loaded condition, draft is 18.5m and KG is 17.5m

notes:
- model this tanker by starting with the 'VLCC' sample maxsurf design, and stretching it to the correct dimensions
- neglect free surface effects on stability
- the above-water profile area in ballast condition is 4960 m^2, with centroid 20m above the keel

It wants me to calculate the GZ curve for both conditions, so I've opened up the VLCC maxsurf file to change the dimensions but I don't know how to get the depth from the above information to enter into maxsurf?

Also I'm not sure why I was given the above-water profile area and centroid above keel for the ballast condition? doesn't maxsurf generate this?

Finally, a question asks me how strong a beam wind gust would be required to heel this ship to 1 degree when in ballast condition, i understand that I have to compare certain areas under the GZ curve to do this but was wondering if hydromax can do this?

any help at all would be greatly appreciated.
Thanks

[Arvy]

Hiya Anth,

You can set the depth through menu option Data -> Frame of reference.

Hope this helps.

[anth]

ok I assume from the question that the DWL should be set to 18.5m. But I still dont know how to get the depth to put into the 'size surfaces' function?