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I have a note in the cloud called Scuba Gear with the inventory, spares, service dates, and notes about setups (hose lengths, etc.). Also the short list of Wants, links for common online purchases, sources for hard-to-find things, o-ring identifiers/sources, etc., etc., etc. TBH, at this point...

Holy cow, this deserves repeating. I had but an inkling when I started. It's been worth every penny, but wow! (It'd have been easier if I lived closer to the wrecks or cave country. I'm not even counting travel expenses. 🤣)

Backplate with 30 lb singles wing and enjoy diving and work on buoyancy and propulsion. This can transition to tech by adding a doubles wing (same backplate). Wrecks with doubles is nice because doors/hallways are narrow/vertical on most wrecks, and it's typically done off of a boat (where SM is...

Yes, it should also compensate for suit buoyancy lost from about 15 ft to the bottom. Even at 130 ft, that will be less than half the surface buoyancy (because that value neglects the solid parts of neoprene). Figure 9 lbs for compression loss and 5-7 lbs of non-reserve gas, and you are at less...

There is no free lunch. An AL80 is about 4.5 lbs positively buoyant when empty. You HAVE to offset that with something (lead or other gear) in order to use it, perhaps to the equivalent of -0.5 lb. Conveniently, an HP100 is already about -0.5 lb empty. The ONLY difference (buoyancy-wise) is that...

That'd be my choice. How negative do you think you'd be if your wing failed?

I plan for 1.5x, but also 2 mins at depth.

No hole in the bottom undergarment means the hose has to come from the top. If yours has a hole or zipper, then you have options. Honestly, not a big deal either way.

I've had no issues with this knot, no super glue required. Halyard Hitch

Yes, and to come full circle, that is exactly why we calibrate the analyzer. That way we can read the fraction directly and configure the computer appropriately.

No, the O2 fraction is still 20.9% (assuming humidity/temp don't shift it). It is the partial pressure of O2 that is 16.6 atm. You should get a reading of 20.9% on a correctly calibrated analyzer.

Unbalanced for me. Fewer things to go wrong, with many reports that they do eventually with balanced.

The article and general equation didn't consider stages, but the concept of consumption increasing on exit (and estimating that based on increments) would obviously still apply. His article assumed a catastrophic gas loss (so yes, a doubles scenario), but application to sidemount (without...

InDepth magazine has a recent article by Stratis Kas regarding the Rule of Thirds, and it makes the case it just won't work in no flow conditions when someone has a catastrophic loss of gas. The main reason for this post is to correct the general equations describing his suggestion for something...

When I was taking various OC tech classes my SAC would increase to around 0.7 cuft/min at the beginning of each one. Once it fell back to normal (0.5ish) toward the end of a class, it was a nice indication that I was no longer stressed.

Alas, I tried that, and they said they couldn't do that. Seaskin referred me to drysuitspareparts.com (UK-based), who indicated it might be possible. Waiting on confirmation and price info now.

IMHO, display a "Ceiling Violated, xx% GF99" warning post-dive with the maximum GF99 incurred and leave it up to the user to gauge the severity. It's a tool, not a babysitter.

Or longer sleeves.

No issues over the course of several years. However, I now switch over to the oval (QCS) rings when it gets warm enough for bare-handed dives (strictly as a precaution). It takes about 2 minutes to swap, so I figure why not?

So much depends on your breathing rate. For a ballpark exchange of 2 liters, the difference in consumption between a 2.5 second inhale/exhale (5 sec total) and 3 sec each is substantial: 0.85 cuft/min vs 0.7 cuft/min. 4 sec each will hit the average value in the ongoing poll here on SB. Take a...