Modern research/thoughts on Ascent Rates

[Manatee Diver]

You can flush your suit, do a deep technical dive, inflate a small DSMB, and still have gas left in a little 6 ft³ tank.

That 6cuft tank was pretty empty after a single cave dive. But it was down to 160, back up to 120, down to 180, back up to 120, and down to 160 again.

 

[grantctobin]

That 6cuft tank was pretty empty after a single cave dive. But it was down to 160, back up to 120, down to 180, back up to 120, and down to 160 again.

Alachua?

 

[Manatee Diver]

Alachua?

Lower Orange

 

[PfcAJ]

If you’re actually doing a deep dive, you’re diluting the air in your suit DRAMATICALLY by just adding argon during the descent.

You don’t really need to flush unless super shallow.

A bit late to the party here, but the WKPP. DCS rate is pretty low these days. I can only think of 1 chamber ride needed since I’ve been involved and that was back during the wakulla/turner connection days. Minor stuff isn’t uncommon, but in my mind it comes with the territory.

1fpm is only a thing on really long dives. I break up the ascent into 5ft chunks after I leave 20’.

 

[Wibble]

Alachua?

Bless you

 

[grantctobin]

Bless you

An old Timucua word for sinkhole, actually. The start of which looks like this:

 

[Heat Miser]

Are you suggesting using an open circuit SMB and inflating it by pressing the wing inflation button while simultaneously holding the wing exhaust valve open? Or using a closed circuit SMB and inflating it by temporarily disconnecting the wing low pressure hose? Either approach seems risky for maintaining buoyancy control.

Step 1
Using an open circuit SMB and inflating it by pressing the wing exhaust valve open, into an open circuit SMB

Step 2
In theory now you are still neutral. And hopefully neither the line or SMB is wrapped around you power inflator.

Step 3
Restoring your bouancy and letting go of the SMB just after pressing the wing inflation button while simultaneously holding the wing exhaust valve open, and then closing the exhaust valve to restore bouancy.

I didn't say it was easy ... its a challenge, but prior posters @Dsix36 @kensuf who are "far more experienced divers than me" were talking about improving skills by inflating the SMB orally from jumping off the DSV (rebreather loop). Revo diver like me have to negotiate their gag strap.

And I was just saying if you want an at least equally difficult way of doing it try the above

Me I ususally just unclip the Low pressure inflator from my bail-out to inflate. Sometimes I unclip the LPI from my drysuit and inflate. Or I unclip bail-out reg from my right d-ring and inflate (if an open-circuit DSMB).

And if I'm feeling experimental I try the above.

And I guess I have a new one to try the following:

I also use my lung volumn to inflat the smb. I dump a bit from the wing and add some extra dil to the loop to remain neutral. this way when i vent into the smb I remain perfectly neutral and can hold the smb to help others, wait until ready, or get untangeled etc. I do not close the dsv either, I just hold the smb overhead , look up, bring smb down on top of dsv, let my lips go loose, and vent. works like a dream. Just need to be ready to bump the wing inflator when you let it go.

 

[Trace Malinowski]

Anecdotal: I think I did exactly 90 straight days diving in 2018 (most of them deco between 100 and 250 feet) before I got bent. That happened within two dives of giving up ratio deco and switching to a GF low of 40 on a Shearwater.

 

[Heat Miser]

Anecdotal: I think I did exactly 90 straight days diving in 2018 (most of them deco between 100 and 250 feet) before I got bent. That happened within two dives of giving up ratio deco and switching to a GF low of 40 on a Shearwater.

Out of interest what GF high did you use?

 

[Trace Malinowski]

Out of interest what GF high did you use?

GF high of 80 or 85. I can't recall which. My Perdix which recorded my dives during that time won't turn on. I need to get the button repaired for the 2nd or 3rd time. When I get it back, the log will be reset so all that info will be lost.