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Vanna... sell this man a vowel... and a clue.. Only a seriously demented stroke would consider this covoluted piece of bat guano. If you are diving with a buddy you don't need some little wuss bottle. You can use the gas of your buddy to ascend safely. If you are solo diving you don't bring some little cheese 2 breath bottle either. You bring something more significant based on the depth. In < 50' do you need to increase your complexity when you can make a free ascent? You are a bonehead Will, Jeff William M. Smithers wrote: > On Fri, 1 May 1998, KybrSose wrote: > > Both tanks are tied together by a pressure hose. When that hose blows< and we > > all know it will> You lose both gas supplies. You have to shut your primary > > and the little bottle does not have a valve. If the second free flows you cant > > shut it off and you are losing your only source of gas. A first stage failure > > is covered by the little bottle but the dreaded tank neck o ring failure is > > still there. But if you dont maintain your first, are you going to maintain > > this thing? You cant hand it to another diver. > > > > You are missing the point - only a moron would leave it attached to > the primary during the dive. You boost the pressure when it needs > to be refreshed, then disconnect the thing - easy filling. > > > Then there is the mindset behind this thing. You can't pay attention to your > > gas supply? You shouldnt be in the water. If this is only for emergency use > > then shouldnt it be bullet proof?? > > Again, you're missing the point. The presumption is that of main > supply failure, which is a fair assumption if you have are diving > singles. A check valve is pretty reliable - again, considering > the nature of recreational diving. > > > If your plan is suck your main dry and > > shoot straight up fine. If its suck your main dry and ascend on the pony fine. > > But then you need enuff gas to ascend safely and a 13 is the edge of that > > envelope. The outer edge. This will give you what ten twelve breaths from 120 > > fsw?. Just slightly better than a spare air suppository. And we all know this > > will wind up at that depth in the hands of that diver. > > > > Al, it is always wise to do the math before making a > strong statement - especially when you know you're dealing with > people who do the math regularly. > > At an RMV of 0.5 cfm, you will get about three minutes at 120 fsw > from an AL13. But in the event of a failure, as a recreational > no-deco diver, you won't be at depth anything like 3 mins - you'll > start the ascent immediately. If you start the ascent immediately, > and assuming an ascent rate of 30fpm, you will use about 7.0 cu. ft of > gas to get to the surface - about half of your AL13. Add in some minor > decompression and/or a safety stop, and you still have enough gas. > > Same holds true even if you plan for a hooverish 0.7 cu. ft. RMV, > although you are going to have to trim your safety stop (which > is just that - for safety, and holds a very small probability > of inducing bends if it is blown off - and the resulting bends > are rarely if ever life-threatening anyway). > > > If you have a real pony you can switch to it and motor home. This is a > > convolution, right up there with bungee wings, 80/20, metal to metal, poodle > > jackets and curb feelers on the sides of your doubles. It's crap. > > > > My point: dont't do a classic knee-jerk by sucking Hogarthian dick here. > The right tool for the right job - and dive circumstances. I stick: > for recreational diving, it's a whole different ball of wax - don't > be so quick to pass judgement with the eyes of a technical > diver - that is called hubris - or have you forgotten your roots? > > -Will > > -- > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Jeff Bentley jbentley@cr*.co* http://www.crl.com/~jbentley -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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