85m air dive

[Blackwood]

.....and I am still waiting for your 30 min BT @ 300ft setup.

Wasn't the point of this sidetrack "how do you balance a bazillion cylinders," not "how much gas do you bring?"

I have never seen anyone carry that much gas!!!

I have. It was two little cylinders, and one big canister of sorb

My "moronoxic" diving requires backup gas (used with a back-up plan, something you do in dive planning) and rules of 1/3.

Like Ian, I wonder why you require 1/3s for open water diving (I'm assuming you mean you start coming up when you've used 1/3 of your gas, not that you are swimming from someplace to which you must return and turn around after going through 1/3 of your total gas less whatever you've reserved for ascending your team). Sometimes it works out to be fairly close to a rigorous, detailed gas plan, but I find that's a convenience I won't count on.

 

[jtivat]

.....and I am still waiting for your 30 min BT @ 300ft setup. I have never seen anyone carry that much gas!!! Or did you strap a compressor to your plate? Maybe I am wrong, and you don't need that much gas as you dive solo to these depths?

My "moronoxic" diving requires backup gas (used with a back-up plan, something you do in dive planning) and rules of 1/3.

Ok I really should have said 260' as that is I dive I do often but I will give you the math for 300'

Bottom gas 12/60 I will use 160 cu ft. I will carry 300 cu ft.
First Deco gas 21/35 I will use 60 cu ft. I will carry 80 cu ft.
Next Deco gas will be 50/25 and I will use 40 cu ft. and carry 80 cu ft.
Last will be O2 I will need 33 cu ft. and carry 52 cu ft.

As for carrying that much gas I have seen more for a 427' wreck dive.

 

[jtivat]

Wasn't the point of this sidetrack "how do you balance a bazillion cylinders," not "how much gas do you bring?"

.

Maybe he realized that you can't and that he is wrong.

 

[Hammerhead]

No it's not. Normoxic have a MOD of 210ft, with trimix you can drop the O2 below 21, but I am quite sure you know that.

*snicker*

Keep going, son, you're special.

 

[diebeste]

Yes a 1.5 is weird and I have never seen anyone on a boat doing real dives with a bottom mix that high only on the internet do you see it. I am not sure where my old Normoxic trimix card is right now but I believe it stated I could gets fills down to 19% O2 and no matter what the O2% there are still three gases right???? Really 69' because 70' would kill you right?

Actually AJ being South African, probably uses his mix to 21m (68.9 feet, or 69 feet). 70 feet has no special meaning in the metric world

 

[ianr33]

Yes, 1.5 is not wierd. 21/40 is normoxic, not trimix. I also use 50% at 69ft and 100% at 20ft (both 1.6 PPO2).

Dude, pO2 of 50% at 69 feet is 1.545
At 70 feet its a whopping 1.561

So, why not do the stop at 70 feet or even (gasp!! 71 feet) You're within the 1.6 guideline and not busting your 70 foot stop which would annoy your computer.


Or do you do your 70 foot stop on your normoxic then ascend to 69 feet to switch to 50% ?

Please tell me you're trolling and you don't really believe this stuff.

 

[Rainer]

Let's stop busting his balls about the 50% switch depth.

I think we can all agree, sometimes a little 69 is what's called for.

 

[Rhone Man]

*snicker*

Keep going, son, you're special.

Not trolling, but I don't understand that post. I had always under that "normoxic" referred to trimix with an O2 content of between 18% and 22%? Presumably that would be correct with the MOD which AJ had indicated in his post (18% O2 max MOD at 1.4 ppO2 is 223', if my maths is right)?

Not a trimix diver, but always keen to learn something new if I am missing something obvious.

 

[jtivat]

Not trolling, but I don't understand that post. I had always under that "normoxic" referred to trimix with an O2 content of between 18% and 22%? Presumably that would be correct with the MOD which AJ had indicated in his post (18% O2 max MOD at 1.4 ppO2 is 223', if my maths is right)?

Not a trimix diver, but always keen to learn something new if I am missing something obvious.

You are right but our boy AJ believes Normoxic needs to be 21% and that would be really high at 200+.

 

[Cave Diver]

Not trolling, but I don't understand that post. I had always under that "normoxic" referred to trimix with an O2 content of between 18% and 22%? Presumably that would be correct with the MOD which AJ had indicated in his post (18% O2 max MOD at 1.4 ppO2 is 223', if my maths is right)?

Not a trimix diver, but always keen to learn something new if I am missing something obvious.

One poster appears to be under the impression that "normoxic" is not trimix, but rather it's own special gas. Refer to the conversation quoted below for perspective on your question:

I don't do 300ft dives, but have blown a few bubbles around 200. Mix:21/40 (normoxic, not trimix), deco on 50% & 100%, 4 deep stops.

Normoxic trimix is still trimix...

21/40 is normoxic, not trimix. I also use 50% at 69ft and 100% at 20ft (both 1.6 PPO2).

Normoxic refers to containing normal levels of [-]air[/-] oxygen.

Trimix refers to a a blend of three gasses.

The two are not mutually exclusive. If you have 21/40 that only accounts for 61% of your breathing gas. What is the remaining (third - tri) gas in your mix?

No it's not. Normoxic have a MOD of 210ft, with trimix you can drop the O2 below 21, but I am quite sure you know that.