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Oxygen masks

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brian

Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA

Posted: Tue Feb 14, 2006 6:48 am Post subject: Oxygen masks

Shinden33 wrote:



 	  Quote: 	
		   You can buy one of the 55 or 33's with both the boom mic and Oxygen mask? So

 it is wired for a mic in both the boom and the mask or do you switch them

 out?


	


Flight Suits Ltd. in El Cajon, CA, USA.



 	  Quote: 	
		   Can you use the military oxygen masks with civilan O2 systems?


	


The mask goes with the regulator. They form a system. The military has

long used the diluter-demand regulator that mixes ambient air with O2 in

a proper proportion to maintain the necessary level of O2 in the

breathing mix. At sea level it is set for 100% ambient air and it adds

in more and more O2 until reaching 100% O2 at about 30,000 feet. Some of

these regulators also provide pressure oxygen in that they actually

provide an overpressure (greater than ambient pressure) to the lungs to

force O2 into the bloodstream. Tohat allows you to go as high as about

42,000 feet. (I forget the exact number but I know it was above 40,000'

and below 45,000'.)



The problem with the diluter-demand system is that, while better than

constant flow O2 systems, it is not as efficient as the new pulse-demand

O2 systems. If you want a system that will provide O2 while conserving

your O2 supply so that you don't have to refill your O2 tank as often,

you need to be looking at Mountain High or Nelson O2 systems. These

systems are much better at delivering O2 to your lungs than the much

older diluter-demand system. OTOH, they do not have the pressure O2

capability so if you plan to operate your CJ6A or Yak-52 above 30,000',

you will need to get the diluter-demand regulator.



Mountain High has a mask that was developed to use their pulse-demand

system and can be adapted to your helmet. I don't think Nelson has a

mask but I don't see why the Mountain High mask can't be adapted to the

Nelson pulse-demand regulator as the output of the two regulators is the

same.



I like the Nelson regulator because it does not need electrical power.

It does require you to set an adjusting dial to your altitude just like

the nasal canulas which is something else to remember when you are flying.



The Mountain High regulator requires electrical power but is fully

automatic. You just turn it on and forget it. OTOH, if you lose

electrical power and don't realize it, you could end up just going to

sleep, not a good thing.



http://www.nelsonoxygen.com/



http://www.mhoxygen.com/



Here is the link for the Mountain High pulse-demand mask:



http://www.mhoxygen.com/index.phtml?nav_id=28&product_id=406



Hal "Batman" Morley convinced me of the efficacy of using O2 even at

relatively low altitudes (10,000'). I found that I felt much better

after a long flight if I did so and started doing that regularly. I

installed a permanent O2 system in my CJ6A and enjoyed the benefits,

even when using a nasal canula with helmet. I also found myself

operating my aircraft above 14,000' regularly. The cost of O2 was more

than offset by the ability to reduce fuel costs at the more-efficient

upper altitudes.



-- 

Brian Lloyd                         361 Catterline Way

brian-yak at lloyd dot com          Folsom, CA 95630

+1.916.367.2131 (voice)             +1.270.912.0788 (fax)



I fly because it releases my mind from the tyranny of petty things . . .

- Antoine de Saint-Exupery

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_________________
Brian Lloyd
brian-yak at lloyd dot com
+1.916.367.2131 (voice) +1.270.912.0788 (fax)

I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery

shinden33(at)earthlink.ne
Guest

Posted: Tue Feb 14, 2006 4:48 pm Post subject: Oxygen masks

Thanks for the gouge everyone!



Still have a question.  If you get standard military diluter-demand system

will it connect to civilian systems.  I have never working with aviation O2

systems before so excuse my ignorance on how they all work together.



Scott



--

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brian

Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA

Posted: Tue Feb 14, 2006 5:38 pm Post subject: Oxygen masks

Shinden33 wrote:

 	  Quote: 	
		   

 

 Thanks for the gouge everyone!

 

 Still have a question.  If you get standard military diluter-demand system

 will it connect to civilian systems.  I have never working with aviation O2

 systems before so excuse my ignorance on how they all work together.


	


Well, you have the high pressure side coming out of the tank. That is

just a matter of the correct fittings between tank and plumbing, and

plumbing and regulator.



I guess the question is where do you want to connect the diluter-demand

(AN-12) regulator (the AN-14 is the pressure breathing regulator for use

above 35,000') to your civilian system? The output of the tank will feed

the regulator just fine but many civilian systems use a step-down

regulator at the tank so the plumbing throughout the aircraft is only

carrying low-pressure O2.



I would need more details about what you already have in order to tell

you how to hook it up. But, yes, you can use your existing O2 tank to

feed the diluter-demand regulator. It is just that the newer

pulse-demand systems are so much better at utilizing the O2 in your tank.



-- 

Brian Lloyd                         361 Catterline Way

brian-yak at lloyd dot com          Folsom, CA 95630

+1.916.367.2131 (voice)             +1.270.912.0788 (fax)



I fly because it releases my mind from the tyranny of petty things . . .

- Antoine de Saint-Exupery

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

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