Optimal Pony Bottle Size for Failure at 100ft?

[Celt]

The reality of an emergency ascent is totally different than what people are thinking, when you make a 100 foot emergency ascent ( I made one from 140 feet in 2 minutes and was able to get a breath at 60 feet from a tank that was empty at 140) gas is expanding if you’re going fast enough and you couldn’t inhale even if you wanted to till you stop.

 

[lowwall]

The reality of an emergency ascent is totally different than what people are thinking, when you make a 100 foot emergency ascent ( I made one from 140 feet in 2 minutes and was able to get a breath at 60 feet from a tank that was empty at 140) gas is expanding if you’re going fast enough and you couldn’t inhale even if you wanted to till you stop.

FWIW, we are talking about an ascent on a pony after a failure or out of gas on a single tank rig. Not a CESA.

At least that's what we started with. At this point?
¯\_(ツ)_/¯

 

[MarkA]

With all the joviality that the last seven pages have engendered, I thought I'd actually go back and read the whole thread!
And to my pleasant surprise, there were lots of proponents of 19, 13 and even 6 CF pony's, early in the thread. Cool!
Just for fun, I plugged in my own SAC, assumed that I wouldn't freak out much, but gave myself 15 seconds to make the switch before I started up. Damned if even a 6 wouldn't get me out of 130 feet!
View attachment 879432
I'm not kidding. The doubles, or AL40 that you left at home is clearly inferior to the 6, 13 or 19 that you threw in your carry-on and filled with @Couv 's portable transfil adapter in your resort room.

Maybe the thought process is different depending on how you get to your diving. The difference between flying to holiday diving compared to driving with your own cylinders to go diving.

Driving would allow the smallish twinset or larger pony cylinder for diving in the 30 to 40m range.

 

[Celt]

FWIW, we are talking about an ascent on a pony after a failure or out of gas on a single tank rig. Not a CESA.

At least that's what we started with. At this point? ¯\_(ツ)_/

From 100 feet 2 breaths is plenty.

 

[OMyMyOHellYes]

Dude, just STOP with the 1 minute stops thing already.

If you feel that you have to stop every 3m/10' , just a 10 second pause absolutely ensures that you can't be exceeding 60' per minute even if you are teleporting between stops.

Interesting question that brings.

On Star Trek, the crew usually always used the transporter on and off the Enterprise. They also seemed to ignore the varying mass of the planetary bodies onto which they transported, or more to the point, the gravitational effect of the planetary mass.

Now, if they were on a giant planet for a few days, and their musculature and skeleton could handle it somehow, the atmosphere would also likely be much much higher pressure than that onboard. How did they not get bent coming back up? Or did the transporter matrix, at an atomic particulate level, screen for and purge excess nitrogen before the re-materialization phase?

Same when transporting to much lower mass planetoids, but in reverse.

 

[OMyMyOHellYes]

Interesting question that brings.

On Star Trek, the crew usually always used the transporter on and off the Enterprise. They also seemed to ignore the varying mass of the planetary bodies onto which they transported, or more to the point, the gravitational effect of the planetary mass.

Now, if they were on a giant planet for a few days, and their musculature and skeleton could handle it somehow, the atmosphere would also likely be much much higher pressure than that onboard. How did they not get bent coming back up? Or did the transporter matrix, at an atomic particulate level, screen for and purge excess nitrogen before the re-materialization phase?

Same when transporting to much lower mass planetoids, but in reverse.

So to extend that even further, if the transporter is actually eliminating the nitrogen load prior to the re-materialization phase, why wouldn't they just transport directly from depth in an OOA emergency?

Also could we use transporter technology to make hyperbaric chambers obsolete? From first surfacing, just transport a bent diver and drop him right back on the deck, not bent.

 

[Tigerpaw]

Transporter compensates for it, just like the bio filters takes out any pathogens.
Scotty is the BEST hands down, nuff said!!!

 

[rjack321]

This is ridiculous! The calculations are simply WRONG. You forgot the 3 minutes on the bottom that are required to free yourself from fishing line, nets and fight off a Kraken or two.

As someone who was attacked by a Kraken (large giant pacific octopus on my head) I can say the buoyancy goes to sh*t and gas consumption is off the charts, although it's hard to distinguish how much is from breathing and how much is from the Octo pushing on the purge button.

This was at Sares Head wall off Fidalgo Island for the locals.