[PSUBS-MAILIST] drop weight

[hank pronk via Personal_Submersibles]

Thank you guys, that makes complete sense.  I am reconfiguring Elementary 3000 and want enough weight in the drop weight and no more.  I have to add buoyancy to cover that weight.  Luckily my balance is not an issue because I have a lot of buoyancy from trawl floats near the top of the sphere.Hank 

    On Saturday, November 12, 2016 10:02 PM, via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

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

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