how to get maximum GZ

Dear All
Good Morning,
i have question.
I have 135" fiberglass boat its already built but after the inclining experiment i can not get enough GZ.
To get enough GZ i have to increase bouncy for next sister ship (model)
is there any suggestion or trick to increase the GZ or bouncy??
Kind regards
Muhammad amjad

 

Hi Muhammad,

There are only 2 options open to you.

1) Lower the KG...ie like adding ballast low down in the hull.

2) Adding flair/tumble home to the hull side to increase the effective breadth.

 

Thanks sir to reply me.
I am agree with option 1

I am planing to adding the weight in keel
or
I will move (underwater) bow area little forward.
I hope it will me enough GZ

 

No need to hope!

If you have already done an inclining experiment, and you have the hull form in a hydrostatics program, you will have obtained your GZ curve. Since you know it is deficient, yes?

Thus, it is a simple case of working out the location of the KG that will pass the criteria you're looking at. From then, you can do a simple moments check to see how much weight is required at what distance from the keel.

Guessing is not required, simple calculations shall yield the answer. It may also surprise you too.