'Non' DIR or DIR diver?

[Doc Intrepid]

"DOC.... you are '100% correct'....my question is 'genuine'!....."

Excellent. No issues then.

 

[texdiveguy]

Excellent. No issues then.

Thank you.

 

[nadwidny]

If the best you could do before was to tell me that your deco on the fly simply equals the equivalent of +2 on V-Planner, then it seems self apparent to me that your deco on the fly is too aggressive for all divers.

If now you are adding to your story and saying "Oh yah, we can make it more conservative if we want," then that is inconsistent with your first story.

Even so, either way, I think you should trash deco on the fly completely, and stick with computer programs that generate profiles planned in advance. Not that it truly concerns me, however. In fact, it would be better if you simply keep doing what you are doing. It gives the local chambers more practice, that way. They need practice. They are not getting much practice from anybody else.

All this ranting against RD is pretty funny since we do RD when we are feeling conservative and generate profiles when we feel like pushing the envelope.

 

[jefffalcone]

I'm also curious if people really use helium in the 80 - 120 range? I'm fairly new and I was under the impression that helium was only used much deeper than this.

 

[vbcoachchris]

I'm also curious if people really use helium in the 80 - 120 range? I'm fairly new and I was under the impression that helium was only used much deeper than this.

In Lake Washington, 6 feet of viz on a good day, zero ambient light, and one false fin stroke caues zero viz to occur instantly, you betcha I use 30/30 (or 25/25) from 80 -100. On a dive in the tropics with 100 feet of viz, 32% works great for my team from 80-100. GUE no longer recomends 30/30 past 100 feet.

 

[jefffalcone]

Forgive my ignorance, I have no tech training, but is this just to avoid narcosis? Are you takling about diving overhead environments in Lake Washington? If not why not just stay far enough from the bottom that you're not going to stir up silt?

I plan on getting the training to answer these questions in the next year or so, but until then all I can do is ask. For now I'm just a Padi trained rec diver trying to gather all the information I can.

 

[Geoff_H]

The best cure for this is simply to let everyone who does not know any better simply go on diving that way, especially deco on the fly. Because this gives the local hyperbaric chambers a lot of practice. And that way the chambers will always be ready in case a smart diver needs to pay a visit, which is rare, if ever.

The sheer arrogance of this statement rivals anything I've read on this forum.

 

[vbcoachchris]

Forgive my ignorance, I have no tech training, but is this just to avoid narcosis? Are you takling about diving overhead environments in Lake Washington? If not why not just stay far enough from the bottom that you're not going to stir up silt?

I plan on getting the training to answer these questions in the next year or so, but until then all I can do is ask. For now I'm just a Padi trained rec diver trying to gather all the information I can.

No Worries

Yes it is to avoid narcosis (although I believe Helium is easier on the body for deco as well)

No I would use a little more He for overhead. (21/35)

Because the wrecks seem to fall all the way to the bottom and there is cool stuff under them or near the bottom. Not to mention the wreck themselves are often covered in silt

 

[texdiveguy]

In Lake Washington, 6 feet of viz on a good day, zero ambient light, and one false fin stroke caues zero viz to occur instantly, you betcha I use 30/30 (or 25/25) from 80 -100. On a dive in the tropics with 100 feet of viz, 32% works great for my team from 80-100. GUE no longer recomends 30/30 past 100 feet.

Thanks for your reply to our questions.....it must get sorta pricey doing dives based on the 25/25 mix for 80-100ft. dips......I'm still not seeing the advantages of this gas He choice on these depths. ???

And I would be more than 'happy' with 6ft. vis in most our inland waters here in Texas...

 

[TSandM]

It's a team choice. 32% is perfectly acceptable to 100 feet. I personally have significant issues with narcosis at that depth, especially in poor viz, and therefore, if I really want to enjoy and remember a dive carried out primarily there, I'd love a clearer head, which is why I took the Rec Triox class in the first place (as well as to improve skills, because I think dives at that depth are starting to look much more like overhead dives, in the sense that the surface is often not the best option for problem solving).

There are not a lot of dives where I would use 30/30, but when I spent the money to go up to Nanaimo and dive the wrecks there, which are all in that depth range, another $50 for helium would not really have been noticed.