Optimal Pony Bottle Size for Failure at 100ft?

[SpaceX Aquanaut]

You clearly have a good understanding of the issues, even if we disagree on implementation. I've been perusing the forums trying to learn more about RD 3.0. I keep seeing comments about using RD in addition to other deco planning tools for tech diving as a sanity check as well as emergency backup.

Honest questions: Do you use a dive computer for planning or diving? If so, do you use one with an RGBM algorithm or Buhlmann? What settings do you use?

Shearwater Petrel2 Computer on full Buhlmann algorithm (90/90), for ten years now -for both recreational and tech dives (in which I always bring an AL 40 of Oxygen).

Actually, I think now that UTD indirectly addresses the Deep Stops issue/Spisni Study by offering an Oxygen Clean-up Certification for Recreational Divers regularly encroaching on NDL Limits (or just for good anti-DCS margin for old farts like me), as well as cutting back on intermediate stops in RD3.0 before the first mandatory deco gas switch on Tech dives. . .

 

[rsingler]

Thank you.
For a guy who dives 50/70, and is testing 60/70 for myself, how often do you actually surface from a tech dive with a GF99 above 80?

 

[SpaceX Aquanaut]

Thank you.
For a guy who dives 50/70, and is testing 60/70 for myself, how often do you actually surface from a tech dive with a GF99 above 80?

If I have to, conservative resetting on-the-fly of the Surfacing GF to 70 or 60, in order to extend the O2 deco profile (especially after consecutive dive days of mandatory decompression dives) -or will just do at least 30 to 50% more than the Petrel’s prescribed O2 stop time.

The downside of that though, your O2 CNS Level OxTox Tracking on the Petrel post-dive goes through the roof (250 to 300 and above).

 

[rjack321]

Thank you.
For a guy who dives 50/70, and is testing 60/70 for myself, how often do you actually surface from a tech dive with a GF99 above 80?

You weren't asking me but at 56yo my answer is never by choice

 

[Diver-Drex]

@SpaceX Aquanaut
Thanks, I thought it was UTD. Someone pointed this out but what you are saying isn’t the UTD min deco ascent. Your first stop is at half depth.

But whatever your ascent strategy, you have to do the rock bottom calc and size your contingent gas appropriately. I don’t think anyone is arguing that.

Much respect and thanks to LAFD and alll of the emergency personnel out there.

Go Birds!

 

[rsingler]

You weren't asking me but at 56yo my answer is never by choice

Nope

 

[SpaceX Aquanaut]

You weren't asking me but at 56yo my answer is never by choice

Nope

Unless @rjack321 is escaping an attacking Giant Pacific Octopus that’s hitting his Purge Button!