Re: [PSUBS-MAILIST] emergency lift bags

[MerlinSub@t-online.de]

To open the hatch at -1 ft seems a better solution = drop weight. 

20 ft = 6 meter depth - hatch of 2ft diameter has a area of 0,283 m2 
so at 20 ft the pressure on the hatch wil be stil 1,7 ts. 
Means in even a full dry boat with just destroyd mbt you have to 
flood it and destroy all the interior by saltwater.. 

"If you have air a to blow an lift bag - means you have still air to blow the mbt"

Lift bag is a good thing to have - on shore in store at the car close to the diving spot. 

vbr Carsten 


<Recon1st@aol.com> schrieb:
> I am wrestling with enlarging my MBT's for more  reserve.
> What I am thinking, is for sure I need more, but do I  really.
> As is I have enough freeboard for normal dive operations. 
> But am uncomfortable as far as a flooded outer tank  etc.
> 
> or an entangled situation. 
>  
> I am thinking that a 6600lb lift bag for emergency use is  about
> as good as it gets. If mounted as we discussed earlier and inflated 
> from within manually would do a nice job. That much capability  I
> could actually surface even under a full flood situation. The  idea of
> opening the hatch at 20 ft sure seems a lot niceer than at 350  ft.
>  
> Any thoughts on this
>  
> Dean
>  
> 




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