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I see only a news article .... No study no evidence ... While PE are a serious issue and might lead to loss od aircraft and crew, what you are reporting is hardly related to diving excepting maybe high WOB. While I do not know the details of the oxygen concentrator used un the F18, I observe...

^What he says, he said it better! :D

I am getting late into this conversation but .... I will not repeat the suggestion given about book readings. I want just to highlight that you correctly say the algorithm uses 16 compartments but these are mathematical abstractions using a dissolved gas (exponential) solution law. Gas enters...

Are you a flyer? :wink: This is EXACTLY what we say in flying! Being behind the aircraft: react to events, being ahead planning and proactively manage the events. When you fall behind it becomes more and more difficult getting back ahead and avoid missing things. You become more task saturated...

Agreed, I was just thinking of the risk areas: Diver Equipment Environment Pressures Citing the risk matrix. Recency on the other hand could have played a big role.

Once again, how much is too much? Commenting in hindsight is easy. The reason we do it is understand the failure point and prevent them next time we go diving. So how many of us will go in low visibility cold lake with a buddy and try to manage their buddy ascent? Please if you do, do it without...

I am not going to say that rebreather diving is safer than OC diving, it is not. But this mishap started well before entering water. Diver had been not diving for several months, yet dive was planned and executed in challenging conditions. Choice of gas was hardly adequate: wob in CCR mode is...

You are probably right. Twice was not precise enough. You need 2,05338 down to 1,70358 times the dowstream (ambient pressure) if you use air, changing gas might change. Oxygen is quite close to air since is a bi-atomic gas The reason why 14 bar might be sufficient is because while not achieving...

The CMF physics requires two things: - constant density (hence constant pressure) - pressure at least twice than ambient. The second is necessary to have sonic flow (and therefore constant speed since the speed of sound is only function of the (absolute) temperature which in the range we can...

Think about handing over your bailout which is also your only OC source and then, while climbing the ladder, a wave makes you fell over and you tear the loop in the process. No so improbable ---- Cheers

Right! That happened to me by running out of inflation gas and it is not fun, had to plug offboard dil in wing ... And at that time I had: -air for wing and suit -onboard dil (plugged in MAV and ADV) -offboard bailout (pluggable as dil and wing gas) Due to this, I did slightly alter my config...

Well there are high precision analyzers like the following: Portable Oxygen Analyzers from 0.1 ppm up to 100% oxygen GPR-1000, GPR-1100, GPR-2000 & GPR-3500 MO | AII Inc You can reliably measure from .1 ppm to 100% oxygen. Now forget about scuba diver shop prices. People doing very deep...

I am Air Force physics of atmosphere is important so I do have (for fun) a psycromether What is a Psychrometer? but you are reading me wrong. I am saying that you do not need to have such precision in analyzing a deco gas. Ambient air even w/o correction or a bottle of air would do and would...

Right! Most have thermometers (wet bulb and dry bulb with tables to calculate RH or a dry bulb thermometer and an hygrometer) ... Easier to calibrate in ambient and accept the error or use a bottle of air. Also you can use to check the ambient calibration. cheers

that is exactly my point. you calibrate to the table for temp and humidity and you measure dry for sure gas. All of us have a breathable air tank ... at least to inflate the dry suit :wink: unless of course you live in the tropics :cool: were you would need it most for the calibration and not...

Well calibrate it with compressed air if you trust the compressor ... and the air it is pumping. Also the barometric pressure becomes compensated if you calibrate at the same altitude at which you are measuring (unless at the tropics while the eye of a cyclone is going through in which case...

Please forgive me for pointing this out but you are not analyzing atmosphere you are analyzing a very dry gas that have been through filters, compression, dehumidification then filtration with a molecular sieve and mixed with pure oxygen. Now if you have anything more than dry gas in your tank...

It pretty much is. Some believe prebreathe is to check that the scrubber is working or to preheat the scrubber. A study was published that shows that this is not true. The pre breath is to show in a safe environment (dry and easily rescued) that life support equipment really is supporting life...

I also saw it on FB, then I went to the website. I thought that people that were interested in the thread might not come across the link on FB. Those who have read a few of my messages might be aware I am a flyer. In my field we believe that the only way to increase safety is understanding that...