triox vs. trimix?

[Clare Gledhill]

Originally Posted by nickb

Ah fair enough, I was infering from Howard's post that you fellas were using 1.2 as the max
I try not to do any work down there (bit like being at my desk really). If there's a current, I'll stay in the lee of the wreck, drift with it or pull my self gently along the wreck with my hands - unless you're there to tell me off for using my hands
I've never done a 2.5 hour dive. If I did, I reckon I'd be losing the will to live by then and an ox-tox would be a welcome relief Seriously though, if I had to be in the water that long, I'd wind the PPO2 back even further, especially if I was planning to deco on O2. As it is, I'm rarely on the bottom for more than an hour.

See - we're in agreement really. Even about the using your hands. I popped round the bow of the wreck on Saturday and hit a two to three knot current. Big mistake Pulled myself back in a hurry I assure you!

None of this is rocket science. Common sense is exactly that and the laws of physics don;t change because you have any particular letters on your cert card.

[Howard Payne]

Even about the using your hands

Just sent Nick some green saying the same thing - pull and glide works great for me in a current

[nickb]

Better still: get inside the thing and stay out of the current*










* don't do this without proper training boys & girls - unless you're name's Ben and you really want to live up to your handle

[Ferg3333]

Originally Posted by Brian of Aquanauts

Going through my TDI Instructor manual all I can find for deco gas requirements is "Cylinder volume appropriate for planned dive and student gas consumption". So TDI leave this to the instructor, do IANTD recommend your reserve amount?

IANTD recommends 1.5 for back gas (thirds) and 1.2 for the decompression bottle generally. As per the encyclopedia(soon to be replaced), although this is STRESSED that this is the absolute minimum amount required. I usually get people to plan their dives using a significantly higher RMV this way you will have some more gas than you need unless you triple your SAC, especially if people diving dissimilar sized cylinders with SAC. Although this still might not be enough.

A good starting point a rough max RMV, is getting them to swim against each other for 5 mins (at 6m) and noting the amount of gas they use. Then working out their RMV from that data. But they only get out of it what they put in

[bottlefish]

Wow, a simple OP about triox, 24 hours later there's 84 responses... you've all obviously got way too much time on your hands (says I that's just read the whole thread... )

Back to the OP on triox and it's uses, as well as reducing narcotic affect on the relatively shallower dives, I'd consider using triox as a travel gas, and possibly first deco gas when doing a deep trimix dive, to level off the nitrogen spikes as you start your gas switching on the ascent....

[Mark Chase]

Originally Posted by Brian of Aquanauts

If there were no GUE courses (and for most these aren't easily available) personally I think your tri-ox course is a WAY better option for UK diving than ADV. Nitrox and Deco, and would highly recommend it above that alternative.

Going through my TDI Instructor manual all I can find for deco gas requirements is "Cylinder volume appropriate for planned dive and student gas consumption". So TDI leave this to the instructor, do IANTD recommend your reserve amount?

Personaly Id say TDI entry level trimix is a better option as you soon exaust the range of triox but thats just my opinion.


ATB

Mark

[Brian of Aquanauts]

Originally Posted by Mark Chase

Personaly Id say TDI entry level trimix is a better option as you soon exaust the range of triox but thats just my opinion.


ATB

Mark

But you have to dive narked in up to 45m while you get experience with ADV Nitrox & Deco before Trimix.

If this were possible as a first course then i'd agree, but to be inexperienced, and off your box is a bit of a messy combination.

I know lots of people get put off when they have their first CO2 hit, triox at the start would help with that issue.

[Mal Bridgeman]

Originally Posted by Mark Chase

Personaly Id say TDI entry level trimix is a better option as you soon exaust the range of triox but thats just my opinion.


ATB

Mark

Is Rec Triox a "qualifying" cert for ELT? If so then that would be an "easier" route ..... but where would the AN & DP skills be taught? Since I think the ELT course presumes you have them and the Rec Triox does not cover them IIRC.

Mal

[SoggyFox]

Originally Posted by Brian of Aquanauts

But you have to dive narked in up to 45m while you get experience with ADV Nitrox & Deco before Trimix.

is there a mandatory number of dives to be done between 40-45m on deco procedures before you can do trimix?

[Mark Chase]

Originally Posted by IanDennis

Morning Mark

Triox is a single deco mix course- so we would use the 50% for deco.

With a full trimix cert obviously other options are open to divers but at this level the course is about teaching the basics.

For the reduction in narcosis at 40m its ideal.

Best wishes

Ian

No argumnet on this with a Triox course M8 but I thaught the question was on triox as a gas.

ATB

Mark