Rec Trimix

[dherbman]

I will explain how quoting works for JeffG and a couple of others here. You quote what another post says so you can reference it in your own post. The poster intends for you to read what they quote from another post as part of the message so you know what they are talking about or referring to.

If you had read what I quoted as part of the proper post, you would have noticed that Do it Easy had referenced me, and I was thus answering him. It is really not that hard a concept to follow.

~Marlinspike

Thanks for that explanation. I'm not sure why I'm replying to it, but it seems important to you.

 

[TheRedHead]

Soggy, the only thing I'm interested in debating is helium at 100 feet, and my agency TDI, considers Trimix a technical cert. You and I both really understand this. Lamont has been the most helpful in presenting a case for it. In some circumstances, it would be sensible. In some it would be overkill and expensive.

 

[Marlinspike]

Thanks for your help. I wouldn't of been able to understanding quoting if it wasn't for you. <snicker>

Much easier to talk about quoting than anything of substance too. Safer for you.

Right...because people who have 10 times the number of posts than dives have so much knowledge and experience.

~Marlinspike

 

[*Floater*]

Why don't you argue that in the general scuba forum? I get the feeling that Floater ran to the mothership to get a bigger gun. :lol:

Actually the last 4-5 pages of this thread haven't made any sense to me. I'm not even sure what people are arguing about anymore.

 

[do it easy]

Thanks for that explanation. I'm not sure why I'm replying to it, but it seems important to you.

How's the weather over there? I can't tell if it's raining over here or just a 4 way pissing contest?

"Let's have a beer, I would dive with you"

 

[JeffG]

Right...because people who have 10 times the number of posts than dives have so much knowledge and experience.

~Marlinspike

Again..much easier to talk about.

 

[Soggy]

Right...because people who have 10 times the number of posts than dives have so much knowledge and experience.

~Marlinspike

Don't be foolish. A post takes a few seconds. A dive takes hours of preparation, driving, mixing, dive time, clean up. When a post takes a full weekend, or when we can all dive during work, then we can talk dives vs posts.

 

[lamont]

I did a penetration dive of the Cape Breton. ~110-115 ft Very nice to be on mix and keep a clear head.

I did a single tank dive on the Cape Breton and the Saskatchewan with EAN30 and max depths of ~120 and that's what convinced me about helium and doubles. We dropped down on the deck at like 80 or 90 and my buddy and I both started "okay"ing each other like the other person was always asking the question. That was the first tipoff that we were narc'd. Then we dropped down the side to ~120 and i started feeling warm and fuzzy. It was fun, but in the back of my head a little voice was going "and what if something goes really wrong right now?".

I'd really like to go back there and dive it again with doubles, 30/30 and work on running line inside it... We were planning on doing that a month or so ago, but it fell through...

 

[Soggy]

In some circumstances, it would be sensible. In some it would be overkill and expensive.

Is that all you wanted to know?

"Yes, I agree"

 

[grazie42]

This thread just gets stranger with every post...
Is the question what makes a dive technical? (seems to be judging by the last pages)
-The common answer on sb is that any dive with overhead is, virtual or otherwise
or is it
Is trimix technical even if doing a recreational profile?
-I&#180;d say it&#180;s less technically challenging (doing things impaired is harder than doing them "sober") but more expensive...

The 210ft for 20mins:
Decompression model: VPM - B

DIVE PLAN
Surface interval = 1 day 0 hr 0 min.
Elevation = 0ft
Conservatism = + 2

Dec to 200ft (4) Trimix 18/35 50ft/min descent.
Dec to 210ft (4) Trimix 18/35 60ft/min descent.
Level 210ft 15:50 (20) Trimix 18/35 1,32 ppO2, 112ft ead, 125ft end
Asc to 130ft (22) Trimix 18/35 -30ft/min ascent.
Stop at 130ft 0:20 (23) Trimix 18/35 0,89 ppO2, 64ft ead, 73ft end
Stop at 120ft 1:00 (24) Trimix 18/35 0,83 ppO2, 58ft ead, 66ft end
Stop at 110ft 1:00 (25) Trimix 18/35 0,78 ppO2, 52ft ead, 60ft end
Stop at 100ft 1:00 (26) Trimix 18/35 0,72 ppO2, 46ft ead, 53ft end
Stop at 90ft 1:00 (27) Nitrox 40 1,49 ppO2, 60ft ead
Stop at 80ft 1:00 (28) Nitrox 40 1,37 ppO2, 53ft ead
Stop at 70ft 2:00 (30) Nitrox 40 1,25 ppO2, 45ft ead
Stop at 60ft 1:00 (31) Nitrox 40 1,13 ppO2, 38ft ead
Stop at 50ft 3:00 (34) Nitrox 40 1,00 ppO2, 30ft ead
Stop at 40ft 3:00 (37) Nitrox 40 0,88 ppO2, 22ft ead
Stop at 30ft 5:00 (42) Nitrox 80 1,53 ppO2, 0ft ead
Stop at 20ft 4:00 (46) Nitrox 80 1,28 ppO2, 0ft ead
Stop at 12ft 12:00 (58) Nitrox 80 1,09 ppO2, 0ft ead
Surface (58) Nitrox 80 -30ft/min ascent.

Off gassing starts at 155ft

Comments: Doing the same dive with deco of ean50 & O2 gives, almost, the same divetime (+1 min) but uses more tmx which I feel is a disadvantage...

Edit: It goes a bit weird in "imperial" because of some settings that work well for "metric" but besides some suboptimal po2&#180;s and stops it only adds about a minute to the dive...