Search results

Remind us, please, are you switching to O2 on the final stop?

Got mine used a few years back. Works well. I had it modified for replaceable wrist/neck seals because I drive 400 miles for 3 days of diving. I had to reseam it after leaving it on the hood of the truck to dry in sunny/105 deg F heat, obviously my fault. 🙄 I highly recommend the neoprene...

I believe he was referring specifically to the Time To Fly algorithms in the DCs.

Yes

You're confusing the fraction of the components with the partial pressure. Fractions will never exceed 100%, and it is the latter which drives absorption into your tissues. The gas being inhaled is 78% nitrogen at all depths. The partial pressure is 0.78 atm (surface) or 1.13 atm (15 ft)...

The fact the supplied air cannot be at 1 atm, since the water pressure would prevent you from taking a breath. At 15 ft, it would be an additional ~7 lbs per square inch, and there are quite a few of those on a torso.

Sounds manual to me. If you wait until they merely stabilize, you don't know whether or not they're inflated by flow. Don't you still have to turn it off and confirm the readings didn't change?

Did you consider melting a hole through your Halcyon inner panel?

Depends on the orientation of the flow, laminar vs turbulent, fill & exit rates, etc. I agree for low enough flow it's negligible, but aren't we talking about manual addition?

FWIW, the rate of increase of CO2 partial pressure with a breakthrough is the same regardless of depth. (It's tied to your metabolism.)

If you're OK with orange, this has worked great for me... https://natostrapco.com/products/inmate-diver-length-z5-nylon-strap-w-brushed-hardware?variant=39806530060350 They have a black one as well, but the 22mm is eternally out of stock.

Since calibration is just storing the conversion factor between mV and PO2, I don't calibrate unless I have evidence that needs to change. Unlike the typical approach, I flood each cell individually with O2 outside the loop (as opposed to trying to get a pure gas throughout the entire loop) as...

Yes, absolutely use the real gas capacity (z*P*V). It's clear you like to address all the details, so sure, you can add in a reserve for the IP. (Your use of z=1 was correct for that.) FWIW, Subsurface is one planner that understands non-ideal gases. Also, consider picking your reserves based...

Not happening. Even if they were zero-mean (which they aren't), you'd be relying on the equivalent of not throwing three heads in a row. If you do daily calibrations as you're describing, you will be storing the same conversion factor every time. That's certainly a waste of O2. I do a variant...

Unless I've misunderstood, this will not calibrate correctly, as it assumes zero deviation. Say there's a true deviation of 5% at a PO2 of 1.0 bar, so your cell reads 45.3V instead of the calculated 47.7V. If you continue to add O2 when calibrating until it reads 47.7V (and it will as the loop...

@Rogerdd, you're neglecting (or are not aware of) non-ideal gas effects. The pressure drops faster when the tank is full vs half full when removing the same amount of gas. The tank will have more than 2/3 of the starting amount when you reach 2/3 of the starting pressure. Some people try to do...

We did, which is what sparked much of this latest flurry. In msg #131, you quoted this: And then said this: which is simply wrong in the quoted context. Cylinder composition does NOT play a role in "the difference of upward force between beginning and end of a dive". It also riles people up...

By your logic, a wetsuit should be the kiss of death, as it's also positively buoyant and very much so! The reason a wetsuit is not, is because we carry lead or other negatively buoyant things (e.g. steel backplate) to offset that positive buoyancy. The EXACT same thing is done to offset the...

Probably depends on the team. I already have an estimate of the time on my wrist, so the bottom line to me is cleared vs not. However, some people like more "granular" feedback/info; even if it doesn't impact their actions, it can give peace of mind.

When arriving, my experience is typically nothing. When the leader clears, #2 would have already cleared (and agree to the ascent) or signal their remaining time at that point (and become the new leader).