Curious about Your Profiles

[ghrousseau]

Just curious what you Florida and Gulf guys are doing on your rig dives to say 150 ft? Are you guys diving mostly nitrox (say 25% to 28%) and decoing out on 50% or greater.............or are you diving trimix for back-gas?

Reason I ask is because out here in CA people freak out if you tell them you are diving air to 150ft. Also...........do you guys mostly bounce dive on the rigs and wrecks when you spearfish or are you diving square type profiles with planned BT's and planned deco times?

Also, nice to get a tech section to the board.

[intotheblue]

Just curious what you Florida and Gulf guys are doing on your rig dives to say 150 ft? Are you guys diving mostly nitrox (say 25% to 28%) and decoing out on 50% or greater.............or are you diving trimix for back-gas?

Reason I ask is because out here in CA people freak out if you tell them you are diving air to 150ft. Also...........do you guys mostly bounce dive on the rigs and wrecks when you spearfish or are you diving square type profiles with planned BT's and planned deco times?

Also, nice to get a tech section to the board.

If I'm with other spearos exclusively, we pretty much bounce. If a mix with non spearo divers, more square. It also depends on the size of the rigs. I try to dive with He in my gas when I go below 100', certainly at 150'. It's great to have a completely clear head. You need to understand how helium affects your deco profiles and ascent rates, so get the training.

[100days-a-year]

It'd be a good idea to get some of the training talked about above.28% @ 150' is a bit hi on the PO2 for a working dive.I dive air or lean nitrox for most deeper stuff and tri-mix past my comfortable limit for the conditions.

[ghrousseau]

Obviously I would never have a PPO greater than 1.4 for the working portion of the dive. I also think it is wise to keep the END at above 100ft. I was just asking the question...........not really a troll, but some people out in CA go ape***t if they hear you are not on 30/30 Trimix when diving at a 120 ft. The local tech diving community out here mainly dives oil rigs, wrecks, and deep water banks. None of them really spearfish though and they hardly ever do live drops with drifting deco. I was just curious regarding technical profiles and spearfishing in general.

Cheers

[junior]

I bounce 140-150' deep stuff on air. And, stick around for a mintue or two if anything is going on.

[SpearMax]

I was just asking the question...........not really a troll, but some people out in CA go ape***t if they hear you are not on 30/30 Trimix when diving at a 120 ft.

On the east coast of Florida, we dive just about every weekend to 130 and 140, especially on this spot called the "Hole in the Wall" off Jupiter. We use Nitrox mixes from 28% to 31% depending on the location and bottom contours. We also go to 180 - 200 all the time on just air and use acellerated deco of 80% Oxygen. You can see my profile computer on this link:

http://www.spearboard.com/showthread.php?t=27437

[dagodiver]

Being that I LOVE He I will put in my .02.
30/30 is a great mix for things other than spearing.
spearo's "usaully" dont rack up a bunch of deco time so off gassing the
N2 is not to bad. When I go and do a 200fsw dive and plan on staying longer that 20 minutes on the bottom I usually run 18/35. If I plan on spearing I run something around 17/19 (Heliair) not trimix. I always use 50% and 100% for deco gasses but again when I am not planning on staying longer than "spearfishing times" I just bring the 50%.
He on gasses and off gasses alot easier than N2 and "I" always feel alot better after multi "deep" dives on a light He mix than just air or Nitrox.
YMMV.
I always dive a planned MOD PPO2 of 1.4 and for the tech stuff "past 200fsw" I use an END of 130fsw.

Again YMMV.
I am buy no means a spearfisherman but I will jump in 400fsw any day of the week if there is a big pile of rusted metal to look at.!



Dago.

[SpearMax]

Obviously I would never have a PPO greater than 1.4 for the working portion of the dive. I also think it is wise to keep the END at above 100ft. I was just curious regarding technical profiles and spearfishing in general.

Hey ghrousseau,

You ask about profiles. Here are some screens from my Cochran Gemini, three-gas, air-integrated computer for the first Cobia dive shown in my video located at this thread:

http://www.spearboard.com/showthread.php?t=27437

The first two screens are the overall profile beginning and ending statistics and the gas volume versus depth chart. Of course, I point out where I shot the cobia near the top of that tower on the Ande Wreck. In all of these screens, the blue line is my depth. The brown line is my decompression ceiling. I am diving air (21%) as a bottom gas and 80% oxygen as a decompression gas.

[SpearMax]

The next screens are Oxygen profiles. Note that I stay below a PO2 of 1.4 during the working portion of the dive. Since it is my first dive, the Oxygen tolerance clock has not chaulked up much risk yet.

[SpearMax]

The next screen is my breating rate, which I use the bio-feedback aspect of the Cochran to help control my breathing.

[SpearMax]

This final screen is my ascent descent rate. I went up to the cobias on the tower a little fast, but as you know that is not as important at depth than if it had been shallower. I hope you like this profile analysis. and I encourage you to compare it to the actual video at this link:

http://www.spearboard.com/showthread.php?t=27437

All the best, Tony

[ghrousseau]

Interesting to have all that information. I using a Dive Rite Nitek 1 gas and a Uwatec Bottom timer. I don't have the software interface to download the profiles, but many people I dive with like those features.

Thanks for info. I look forward to your future posts and cool videos! :thumps:

[SpearMax]

Yeah G, The Cochran dive computer is excellent!

[Gutshot!]

Nitrox? Whats that? Air only! Full tank, bounce, whatever the dive calls for to put the big one on the boat.

[trimix]

When I plan a dive on a rig off the Texas coast. I will plan for a MOD of 200 fsw. Using a 19/35 trimix as my backgas. Hang a deco bottle of at least 50% from the boat at 30 fsw and sometimes take another bottle of 30% tie it off to the rig at 50 fsw. The plan is to slowly circle around the inside structure decending all the way to 200 fsw. If there is nothing to shoot start back up. If there is something then I plan on subdueing the monster in 15 to 20 minutes max. Starting my ascent using the deco gases on the way back up. This is my general plan. I will vary the plan depending on the conditions. The main two being current and vis. Take it from me, you can blow through some serious gas quick at 200 ft with a 60# AJ pulling through the water like a piece of laundry in the wind. My rule bring more gas than you think you will need and then double it.

Bounce dives in my opinon are not an option. Yes, go deep, but do it slowly.

[IyaDiver]

Guys,

I never even tried Nitrox, let alone Helium.
I limit my dive to 165 feet on air and 80AL.
My number 1 fear is over exertion, when that happens narcosis
gets to me faster. Water visibility and brightness is another important
factor for me if I want to go deep. I can get narced or I thought I got narced as shallow as 100 feet if water viz is less than 6 feet but will be fine at 165 feet is water viz is 60 feet or better.

One question for you guys.
Now my right eyes is not 20/20 anymore and I never use glasses
before. My right eyes is -1 and I think my left is +1. I forgot what the doctor said
and I still do not like to use the glasses made, which I actually need for reading or browsing like now.

Ever since my eyes not 20/20 anymore, I get dizzy fast when there are lots of
dirt/floating particles in the water while I am trying to focus on the deep blue looking for silhoutte of fishes. I don't use prescription lens for diving. I also get dizzy or I thought I am dizzy if I don't see the bottom or some sort of reference like my computer. This is annoying and degrading my diving performance.

Anyone of you experiencing similiar when going from 20/20 vision to less than perfect like me ?

Thanks
IYA

[Gradyman]

Ever since my eyes not 20/20 anymore, I get dizzy fast when there are lots of
dirt/floating particles in the water while I am trying to focus on the deep blue

Try to use your gun & tip as a focal point when you get dizzy in the low vis or partical water. Relax and stop moving till you get focused.

Glad to see this part of the forum...I'm learning alot!