Re: [PSUBS-MAILIST] Reserve buoyancy

["Sean T. Stevenson" <cast55@telus.net>]

Vance, I'm curious about the failures (leaks, etc.) you encountered 
while working.  Could you list some of the significant ones?

-Sean


vbra676539@aol.com wrote:
> You want a positive metacentric height under any forseeable 
> circumstance. Assuming a drop weight designed to equal a flooded pod, 
> and mounted in roughly the same area, then your metacentric height 
> won't change at all except by the tilt of the sub toward whichever 
> side is flooded. That extra weight will shift the metacentric, as it 
> will move the center of gravity and the center of buoyancy must then 
> also move to the new center. If the pods are wideset like on a Perry 
> or the Aquarius (or the Deepworkers, come to that) then this tilt to 
> one side will be fairly major. It will not, however, cause the 
> submarine to turn over (assuming acceptable distance between CG. A 
> proper design could conceivably be inverted, but it would right itself 
> automatically. But what a mess in the pods! And let's hope none of us 
> has to take that particular ride.
>  
> A side issue to this, but an important one, is a partially flooded 
> pod, which is in fact a whole lot more likely scenario (a slow leak 
> that you don't pick up on until you've been in the water a while). In 
> my experience, you end up with all the water in one end of the leaking 
> pod as you surface, which sticks your nose or tail up whether you have 
> dropped a weight or not. That's when a couple of inflatable surface 
> floats come in really handy. They can get the sub even enough for its 
> pilot to escape or for the surface crew to tow you or lift you out of 
> the water or whatever. It is also a neon bright advertisement for leak 
> detection in each pod!!!
>  
> Vance




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