[PSUBS-MAILIST] drop weight

[via Personal_Submersibles]

Hank,
The spreadsheet I referenced on the Psubs site calculates CG and CB with  
and without the drop weight.  Cliff designed it, and it's a fabulous  tool.  
Besides the calculator, it also sets forth the standards.
Jim
 
 
In a message dated 11/12/2016 10:54:47 P.M. Central Standard Time,  
personal_submersibles at psubs.org writes:

 
Hi Hank,


The drop weight contributes to transverse stability. Be sure to calculate  
what happens to stability when it's dropped. If you have a large weight, it 
is  quite possible the sub's new center of gravity could end up above the 
center  of buoyancy. 




Best,


Alec


On Sat, Nov 12, 2016 at 10:54 PM, via  Personal_Submersibles 
<personal_submersibles at psubs.org> wrote:


Hank,
Yes, there is a rule.  The drop weight must be heavy  enough so that if all 
compartments were fully flooded except for the main  cabin, the release of 
the drop weight would cause the vessel to rise to the  surface.  "All 
compartments" includes battery pods and anything else  that could take on water.
Jim
 
 
In a message dated 11/12/2016 7:49:08 P.M. Central Standard Time, 
personal_submersibles at psubs.per writes:

 
Can  someone tell me what the proper weight of a drop weight is.  There  
must be a rule.
Hank



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