Calculating Objects Floatation Height

[eightwgt]

Hello everyone I need help with a calculation.

I want to determine the height an object will float in saltwater. After running the 'basic' displacement calcs I am not getting the results I need - not accurately enough anyway.
I know that the water displaced by an object equals its weight, but I am confused as to a partially submerged object. Since the weight / displace ment are equal, and an object in the water weighs less than on air- how do you calculate this as far as a formula ?
I am working on redesigning a submersible - and trying to figure where its going to float because I need to get it floating higher on the surface and trying to figure it all out - based on a picture I saw of a simular sub floating much higher than I thought it would I think I am designing the surface ballast tanks to low, and too large perhaps...

Thanks everyone...

 

[anorlunda]

No, take the ordinary weight of the object. Compare that with the weight of water displaced. Think of a boat. The total weight of the boat equals the weight of water displaced. The volume of water displaced is the volume of the boat below the water line.