A bit scary.......

[Madfish]

Whilst poking about & just generally lurking I stumbled on this. I don't remember seeing it here on YD, but apologies if it has been posted before & it is old news. Those of you who dive twin 7's will find it particularly interesting - and I am sure that Phil will be along to sell us some 12's pretty soon. The scary stuff

Dianne

[Sipadan]

Yep, it has been posted before, but it is scary, one of the reasons I decided to go with indies.

[divingniknaks]

Di,

Remember you will have at least one other person there who can and should assist you. At least to point out which post has the problem, so that would speed things up a little.

Thats not to say the article isn't perfectly valid of course.

There are other factors which could be taken into account but given the Forum this has been posted in, I'm not going there

Proves the "Whoredar" is still working though, I thought my ears were burning

Cheers

[Okeanos]

I dive twin 7's 300bar, with an isolation mainfold. I do practice shutdowns occaisionally, roughly 10 seconds in practice, although my best was 2 seconds, I have never had to shutdown in an emergency though. As long as I have enough back gas to get to my first gas switch (usually 40% @ 30m) then I have no problems. If I did lose all my gas at 60m, I would still switch gas, at least I would have a chance. Somewhere I have a chart of extreme O2 exposure times before O2 toxicity hits, it would be dangerous and I wouldn't have long, but it would be a lot better than breathing water.

[Freeflow]

Originally Posted by divingniknaks

Di,

Remember you will have at least one other person there who can and should assist you. At least to point out which post has the problem, so that would speed things up a little.

Cheers

Nice if it were true, remember you can NEVER rely on a buddy to do the right thing, because faced with a set of twins the diver who isn't familiar with them could well turn the knob the wrong way, especially on the left hand knob.

I don't know how 'tech-ed up' you are at the moment, but another thing is to remember to 'gas match' with your buddy-it's no good diving the rule of thirds if your buddy is an air monster on twin 15's when you are on twin 7's.

If you want me to tell you about gas matching drop me a PM or email.

[Little Pete]

I do practice shutdowns occaisionally, roughly 10 seconds in practice, although my best was 2 seconds,

I take it the 2 seconds one is for a just cracked valve?

[Mark Chase]

Originally Posted by Okeanos

I dive twin 7's 300bar, with an isolation mainfold. I do practice shutdowns occaisionally, roughly 10 seconds in practice, although my best was 2 seconds, I have never had to shutdown in an emergency though. As long as I have enough back gas to get to my first gas switch (usually 40% @ 30m) then I have no problems. If I did lose all my gas at 60m, I would still switch gas, at least I would have a chance. Somewhere I have a chart of extreme O2 exposure times before O2 toxicity hits, it would be dangerous and I wouldn't have long, but it would be a lot better than breathing water.

I would strongly suggest you refrain from typing this sort of rubbish as there are quite a few actual divers on here, you know who actually dive twin sets and you know, actually do shut downs.

They actually understand the issues of switching to massively high PP02s at 60m depths as well.

Sorry if you feel I am being to aggressive may I suggest you re register under a different name and start again. I hope you are an enthusiastic diver who just got carried away rather than just a troll.

ATB

Mark Chase

[limeyx]

Originally Posted by Freeflow

Nice if it were true, remember you can NEVER rely on a buddy to do the right thing, because faced with a set of twins the diver who isn't familiar with them could well turn the knob the wrong way, especially on the left hand knob.

I don't know how 'tech-ed up' you are at the moment, but another thing is to remember to 'gas match' with your buddy-it's no good diving the rule of thirds if your buddy is an air monster on twin 15's when you are on twin 7's.

If you want me to tell you about gas matching drop me a PM or email.

Well, if you're doing a dive where you need doubles, you probably want a team-mate(s) that are also familiar with them.

Also, I dont think the rule of thirds works the way you indicate. You have to assume the heaviest breathing diver taking air from the person with the smallest tanks to make it work (yes, an argument for all diving the same size tanks)

[NotDeadYet]

The guy with the mullet scared me. That's enough to make me put my twin 7's to one side.

Thinning hair... mullet... just wrong...

[Garf]

Originally Posted by Freeflow

Nice if it were true, remember you can NEVER rely on a buddy to do the right thing, because faced with a set of twins the diver who isn't familiar with them could well turn the knob the wrong way, especially on the left hand knob.

This is really a non-isse.the article is talking about deco diving at depth. I would hope that few divers trained for such dives are dumb enough to dive with someone who is unfamiliar with either twinsets or my kit on such dives.