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When Marci and I switched to CCR (also Sidekicks) a few years ago we each had: - two sets of back mount doubles - a set of LP 85 side mount doubles - a set of steel 72 side mount doubles - a set of LP 45 side mount doubles - two AL72 stages - three AL 80 stages - an AL30, and - anAL 6 and an AL...

The concern with high boost ratios is the potential for excessive heat due to compression that could result in ignition. I don't know if there is a definitive source, rather than just a industry best practice that states a 4:1 max ratio. However Haskel recommends 5:1 for a single stage booster...

These posts pretty well sum it up. I used a Miflex long hose on a week long pretty fish trip where I wore a shorty and no hood. By day 3 my neck was rubbed raw. Miflex hoses and other braded nylon hoses are not much kinder to neck seals either. Braided hoses also have much more torsional...

I used the KM-48 for cold water technical diving. With the nose and face portion of the mask separate from the oral cavity and its removeable pod, you have a different set of options than with a traditional full face mask. With a traditional full face mask and a BOV, you'd switch the BOV lever...

O2 normally arrived in a high pressure cylinder filled to around 2500 psi. If the shop is transfilling into your tank that's the maximum pressure they can achieve, and they are probably cascade filling off 2 or 3 bottles to keep the pressure in the "high" bottle as high as possible. Other...

Some general thoughts.... 1) Compressed air gets hot and hot air will hold more moisture than cool air. Consequently, when that compressed air cools, the water in it will condense into liquid form. What happens then is that moist air is compressed and heated by the compressor and if fed...

Yes, it's losing 24 wh compared to the regular P1 battery - but a second set of batteries is comparatively inexpensive and you can swap them out between dives. You can also add another battery section and have 720 wh.

Exactly. DiveXtras currently charges $839 for a new Lithium batter for non PTB version of the P1, and by lithium DPV battery standards, that is actually a good price, as most start around $1000. However with the P1 PTB, you can get four Enegitech DCB-205 batteries for $126, and a set of DeWalt...

There are a few things to consider. Whether you're working with aerodynamics or hydrodynamics, drag is a square function, so if you double the speed, you increase the drag by a factor of four. Since thrust has to equal drag, the power required to maintain a speed that is twice as fast also...

They should but they won't. As an example, multiengine general aviation aircraft have worse safety records than single engine aircraft. The reason for that in part is that single engine general aviation pilots fly around knowing that if the engine noises stop, they are very likely going down...

A couple thoughts... First let me also stress that you are not a rebreather diver, and thus might be missing some of the subtle nuances that are involved. Second, Fock based this statement on some very broad generalizations: "With the caveat that they are “best guess numbers,” Fock concluded...

Over the years I dove Comox and Atlan neoprene suits in inland commericla diving as well as O'Neil neoprene dry suits. I also dive the Scubapro Everdry 4. It's a compressed neoprene suit and it's very comfortable with enough stretch to allow for very low drag when swimming it. I have not had...

No, I don't have the same desire I used to have to dive cold water, thus the "I'd" in the sentence. It's not uncommon in the great lakes or in a deep alpine lake to have 35-38 degree bottom temps below 100', and then have 2 or more thermoclines above that with surface temps of 65-70 degrees...

I plan for 1 lpm of O2 use for scrubber life calculations and 1.25 lpm O2 use for O2 planning purposes - the extra 0.25 lpm is based on actual measured use on cave dives and covers normal loop adjustments with depth changes, bumping up the PPO2 during deco, and an end of dive O2 flush at 20' to...

The short answer is "at least every two years". KISS, for example, recommends a two year interval, but it's really a guideline as with heavy use, and/or salt water and/or sandy conditions, 2 years may not be nearly enough. The long answer is that a CCR is composed of different sub systems that...

Some of the things I'm reading are internally consistent, other are internally conflicted, and most of them really depend on regional factors. Accelerated deco procedures should be a given in the generally deeper caves found in N FL simply because a dive to thirds on a set of steel doubles will...

I had a Titan Hydro Light that could be used as a hand held or connected to a cannister. As a hand held it had 3.5 hours of light and that was just not adequate, so I agree with you that hand helds have to provide sufficient burn time to be useful in cave diving. Consequently, I added a can...

There is a lot of good information in this thread. I'm in agreement that you can have too much light in a cave. A 21W LED is the upper end of practical in my opinion. Save the 35W and 50W lights for dedicated video purposes. I'm also in agreement that nothing beats a narrow beam HID when it...

I'm in agreement with the general idea that "Full" Cave is just another license to keep on learning and is not a complete "do everything" certification or an end in itself. I came to cave diving with more than a decade of technical diving, doubles, drysuit, DPV, AN/DP and Trimix under my belt...

I'll play devils advocate a bit and make a couple observations that support both points of view: 1) Does anyone here drive a turbocharged care or fly a turbo charged aircraft? The easiest way to add power in an engine design is to increase the mass flow through the engine. You can do that...