hey, i'm new to scuba diving, and i was wondering what you call one of those small tanks that gives you like 5 minutes of air, and you can breath directly out of a special nozzle on the tank itself.
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Mini Tanks
- Thread startersuperhornet59
- Start date
Thread Status: Hello
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why? i checked it out and it looks kinda good. besides, im not getting into scuba jus yet, to expensive, but i figured i could make like freediving/ scuba hybrid. i want to go realy deep and stay there like in scuba, but i want the feeling of freedom of freediving. so whats so bad about SpareAir?
yes, thats true, but im just thinking, a depth you might get like 30 breaths out of it (surface is 57) so take like 2 breaths for the way down, and use the other like 28 for the slow ascent so you dont get barotrauma. but i absolutly agree, i still need to take a scuba course. and alot of them are saying its safe if you exhale, so it doesnt sound so bad. ut why do you think that the SpareAir is such a waste of money?
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yes, your right but im just saying that at diffferent pressure youll breath in a lower volume of air, so as long as you breath in and exhale on the ascent, you should be fine because the air you breath in wont be so compressed, and you breath out the extra air volume. so take small breath, exhale big ones. but i got your point, but is this feasable? i mean many things are inheritantly dangerous, but can it be done if done properly? (freediving/ while taking occasional breaths)
superhornet59 said:
Unless you have a thorough understanding of diving physics & physiology, you are only asking for trouble by doing what you are describing. The idea of a bail out bottle is for when you make a deeper dive and do not ascend as soon as you normally would. At that point the bail out bottle is meant to get you to the surface in one piece - then you get out of the water and stay out for 24 hours. Standard rules since you are now technically a scuba diver.
To be honest - you are putting yourself in danger by doing what you describe. You are putting yourself at risk for DCI. And any reputable dive facility would require you to show a c-card before selling you one of these. At least they should.
To answer your question - from what I have learned about diving physics and physiology - NO IT CANNOT BE DONE SAFELY.
Here's your sign....:rcard
When spare air came out, i think many of us considered this, but upon further examination it just IS A BAD IDEA. Personally, I wouldn't even consider diving with spare air. It was designed to give you a few breaths in the event that you end up in an emergency situation and really need it. Unfortunately, it often gives divers a false sense of security, letting them think they can stay down longer than they really can, or tempting freedivers to dive below their limits. I have heard that the tanks often vary in the amount of breaths which you can get out of them, thus increasing the danger. If you choose to use one, it should be used in a true emergency only, and not to just extend a freedive! If you want to do that just go scuba diving, it is much safer.
I feel like there is a very small subset of freedivers and scubadivers that are capable of pulling off this kind of stunt safely. I speculate that it is NOT safe without a line or something else that can be used to control ascent / descent acceleration. At the very least a person would need a frame of reference. Without a frame of reference you are forced to rely entirely on the feeling of your chest, and without controlled exhales I do not feel comfortable trusting my lungs to push the air out fast enough to keep them from over expanding, especially during the latter part of an ascent.
What is missing from the universe is some tables to tackle the DCI end of things.
Some conservative tables could be made to tackle all conceivable situations by assuming that Nitrogen absoprtion is based on an unlimited supply, 0 off gassing, unlimited ascent speed, and the entire dive considered to have been spent at the max depth. Trying to factor in at what depth you took a breath and all that mess would overcomplicate things. It would need to be simple or it wouldn't work. Hopefully such tables will having had been generated, one would obtain two important depths.
1) The deepest you can dive for an unlimited time period without necessitating deco.
2) The deepest you can dive for an infintesimal time period without not needing a deco stop.
And hopefully an appropriate deco time/depth for every depth/time in between.
That would be really handy to have...
Oh yeah, breathing of spare air while freediving is stupid, and unsafe. If you want to SCUBA dive, go get certified, and stop trying to pretend. If you want to freedive, then stop screwing around, before you hurt yourself.
What is missing from the universe is some tables to tackle the DCI end of things.
Some conservative tables could be made to tackle all conceivable situations by assuming that Nitrogen absoprtion is based on an unlimited supply, 0 off gassing, unlimited ascent speed, and the entire dive considered to have been spent at the max depth. Trying to factor in at what depth you took a breath and all that mess would overcomplicate things. It would need to be simple or it wouldn't work. Hopefully such tables will having had been generated, one would obtain two important depths.
1) The deepest you can dive for an unlimited time period without necessitating deco.
2) The deepest you can dive for an infintesimal time period without not needing a deco stop.
And hopefully an appropriate deco time/depth for every depth/time in between.
That would be really handy to have...
Oh yeah, breathing of spare air while freediving is stupid, and unsafe. If you want to SCUBA dive, go get certified, and stop trying to pretend. If you want to freedive, then stop screwing around, before you hurt yourself.
Read this http://diveweb.oneandoneis2.com/spareair.htm
Unless you are a Troll, and you already know it. :rcard
Bobco
Unless you are a Troll, and you already know it. :rcard
Bobco
The industry calls them "Spare Air." Once you've had some training, you'll learn why they are next to useless for anything but self-rescue from the most shallow dives. Take the money you'll spend for one and use it for training. Best of luck.
If you check out Superhornet's info you'll find that he's only 15, and probably doesn't know what a joke spare air's are for scuba diving. Once he's done with a class or two, and get's a few dives under his belt he'll figure it out on his own. until then I'll give him the benifit of the doubt and not assume he's a troll.
Having said that, I bought one a few years ago after talking with Kirk about them at DEMA.
No, I don't use it for scuba diving, but I do use mine when freediving with a scooter out in Lake Michigan. It doesn't help me go deeper, as I've never actually had to use it for anything, but incase the scooter suddenly floods I'll make it back to the surface without any problems.
Jon
Having said that, I bought one a few years ago after talking with Kirk about them at DEMA.
No, I don't use it for scuba diving, but I do use mine when freediving with a scooter out in Lake Michigan. It doesn't help me go deeper, as I've never actually had to use it for anything, but incase the scooter suddenly floods I'll make it back to the surface without any problems.
Jon