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I think a more important thing to think about is dropable weight
(either in the form of a lead drop weight or ditch-able battery pods).
If it's ditchable battery pods then make sure your power connectors
don't hang you up (relying on on a plastic locking ring to break would
be a big mistake, heck I've had 16 pin subconn connectors vacuum lock
and take 10 minutes of prying around and around to get loose).
You would use either explosive bolts or a manual through-hull shaft. I
like the manual through hole shaft, just make sure it isn't setup in a
way that relies on having the weights to keep it from being shot into
the sub by the ambient pressure (as in you just put a bolt through an
O-ring sealed hole into the weight assembly).
mike
On Apr 23, 2005, at 9:05 AM, rufus pfingstag wrote:
> Dave Banks wrote:
>
>> Ok....I can't believe I'm even seeing this thread about " Burst
>> Diaphragms " and " scuttle valves".....There is no reason that any
>> one would ever need to open up a pressure vessel to the sea let alone
>> that it could possibly occur when it would be a total
>> surprise....this is a joke ,,,right.. Think about it,,a one inch
>> burst disc at 300 PSI....We spend a lot of MONEY and TIME figuring
>> out how to keep the water out.
>> */"Dan H." <jmachine@adelphia.net>/* wrote:
>>
>> Keep in mind that if this valve opened, your gaining weight and
>> going down
>> faster as the pressure is getting even greater where you'll take
>> on even
>> more water sending you down faster etc. etc. Not a good idea!
>>
>> A scuttle valve is just as it implies. For scuttling the sub as a
>> very last
>> resort. Anything else that lets water in the sub would also be a
>> very last
>> resort valve and you better be prepared to exit because your
>> probably not
>> going to see the surface looking through the viewport again.
>>
>> Dan H.
>>
>> ----- Original Message -----
>> From: "rufus pfingstag"
>> To: "psubs"
>> Sent: Friday, April 22, 2005 5:42 PM
>> Subject: [PSUBS-MAILIST] burst valve
>>
>>
>> > does anyone know if anyone has ever built into their 1
>> atmosphere sub
>> > some sort of pressure relieve valve that would ope! n if the sub
>> reached a
>> > certain depth so that the sub would just flood with water rather
>> than
>> > imploding. also if it hasn't does anyone know of a reason that
>> makes it
>> > unfeasible.
>> >
>> >
>> >
>> >
>>
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> so maybe not a good idea to make something that floods the sub, but
> what if it were something that released air automatially from a
> reserve tank of air into you ballast tank. that way even if you were
> unconcious for some reason you would not get to burst depth.
>
>
>
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