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navycurtissc · 31st August 2005, 04:22

Hello everyone,

Before I get into to this let me preface it by saying that my background is in mechanical and nuclear engineering.

I can't help but notice that just about every CCR out on the market utilizes the same basic mechanical design and that it is only a question of durability and construction materials. My question is regarding the electronics used to maintain the correct PO2 level in the breathing loop.

I have only noticed a couple systems out there (the new vision, the hammerhead, and sharewater). It seems to me (from the research that I have been able to do) that they simply sample via multiple O2 sensors, take a weighted average, and then admit the applicable amount of O2 when apropriate.

Is the major differences between the units in the type of decompression algorithms use?

After this consideration, is the discission based on the user interface and/or asthetic value?

Are any of these syetems interchangable between the mechanical portions of the Rebreather's on the market (could I take a vision control system and slap it on a MEG)?

I understand that the most restrictive part of this may be the cost in doing it, but it seems to me that the electronic control systems and mechanical portions of the Rebreather's are independant of each other.

Also, I have noticed that there are quite a large number of passive computers out there for Rebreather's (like the HS Explorer and the VR3).

Are these simply for back-up in order to be able to fly manually?

Do any of these "passive computers" offer control features via expansion software and/or hardware?

31st August 2005, 04:22	#1 (permalink)
navycurtissc New Member Current Rebreather/s: Other Rebreather/s: Join Date: Aug 2005 Location: Seattle, WA, USA Posts: 10	CCR Electronic Controls? Hello everyone, Before I get into to this let me preface it by saying that my background is in mechanical and nuclear engineering. I can't help but notice that just about every CCR out on the market utilizes the same basic mechanical design and that it is only a question of durability and construction materials. My question is regarding the electronics used to maintain the correct PO2 level in the breathing loop. I have only noticed a couple systems out there (the new vision, the hammerhead, and sharewater). It seems to me (from the research that I have been able to do) that they simply sample via multiple O2 sensors, take a weighted average, and then admit the applicable amount of O2 when apropriate. Is the major differences between the units in the type of decompression algorithms use? After this consideration, is the discission based on the user interface and/or asthetic value? Are any of these syetems interchangable between the mechanical portions of the Rebreather's on the market (could I take a vision control system and slap it on a MEG)? I understand that the most restrictive part of this may be the cost in doing it, but it seems to me that the electronic control systems and mechanical portions of the Rebreather's are independant of each other. Also, I have noticed that there are quite a large number of passive computers out there for Rebreather's (like the HS Explorer and the VR3). Are these simply for back-up in order to be able to fly manually? Do any of these "passive computers" offer control features via expansion software and/or hardware? __________________ Sincerely, navycurtissc "If you are not part of the solution, you are the problem."
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