Anybody has an idea about this?

**navigator** · February 6th, 2013, 06:39 AM

Why 'Z' is used in GZ Horizontal distance in calculating metacentric height, why not 'X' or 'Y' or something. Was asked by my captain and was wondering wat might be the reason, anybody can give any clue? I will appreciate and why is summer loadline calculated by s/48, wats up with the 48. Why 48?. will really appreciate, a lil brain refreshment here... I hope my question is not out of the line here. I'm still in college and hoping might get good advice from my experienced senior colleague's

**BMCSRetired** · February 7th, 2013, 10:35 AM

Why 48? Why not! Why 3.14? Because somebody came up with this formula and it works. Since he put out the extra effort to figure this stuff out, I don't question it because I am lazy but I can only assume that those numbers are used in other formulas and x and y were taken in those.

Anyway, tell your professor and friends this story and attribute it to Archimedes the famous sailor whose Mongol hordes cowardly bombed Pearl Harbor in 1941.

Since you are still in college, change your user name from Navigator to Naviguesser.

**c.captain** · February 7th, 2013, 11:15 AM

Originally Posted by navigator

Why 'Z'

because Z stands for Zorro!

of course, I am a more V for Vendetta man myself

.

**Archimedes** · February 7th, 2013, 11:21 AM

Originally Posted by BMCSRetired

Why 48? Why not! Why 3.14? Because somebody came up with this formula and it works. Since he put out the extra effort to figure this stuff out, I don't question it because I am lazy but I can only assume that those numbers are used in other formulas and x and y were taken in those.

Anyway, tell your professor and friends this story and attribute it to Archimedes the famous sailor whose Mongol hordes cowardly bombed Pearl Harbor in 1941.

Since you are still in college, change your user name from Navigator to Naviguesser.

Should I be flattered, or offended?

**Workboat_Academy-Guru** · February 7th, 2013, 11:41 AM

William George - Author of Stability & Trim for the Ship's officers, posted this question on his linkedin group - Beyond Basic Stability.

http://www.linkedin.com/groups/BEYON...r=&gid=3717991

**BMCSRetired** · February 7th, 2013, 01:28 PM

Originally Posted by Archimedes

Should I be flattered, or offended?

Flattered. My apologies. I thought you had died during the the Great Plague.

**shaq** · February 7th, 2013, 10:23 PM

this is the first time I have ever been annoyed with a poster.

**navigator** · February 8th, 2013, 06:00 AM

Thanks all for your opinion, and those pissed of......

**Workboat_Academy-Guru** · February 8th, 2013, 08:04 AM

I cut and paste Bill George's comments on Z below:

"William George • I think it might be because "X" and "Y" are used for Vertical and Longitudinal references so "Z" would be for Transverse directions? As long as I have been playing with this Righting Arm has always been designated at "GZ" the horizontal distance between the downward forces of the vessel's "Center of Gravity" and the upward force of the vessel's "Center of Buoyancy"."

**cappy208** · February 8th, 2013, 11:10 AM

Originally Posted by Workboat_Academy-Guru

I cut and paste Bill George's comments on Z below:

"William George • I think it might be because "X" and "Y" are used for Vertical and Longitudinal references so "Z" would be for Transverse directions? As long as I have been playing with this Righting Arm has always been designated at "GZ" the horizontal distance between the downward forces of the vessel's "Center of Gravity" and the upward force of the vessel's "Center of Buoyancy"."

Close, but no cigar. When thinking about vessel movement (as in airplanes as well as vessels) it is a three dimential axis that exists.

As much as my young "colleague" ( how preposterous!) Is worried about the inane, maybe just rote and memorization are what is needed. Not spending time on here! Just because you were told you have to open a GCaptain account as part of class, don't think you have to use it!

P.S. The three axis are Pitch, Roll, Yaw. Axis commonly referred to as X, Y AND .............. Z.