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  #1  
Old 11-21-2017, 06:12 PM
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AX-O AX-O is offline
 
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Default Looking for help setting up O2 with my jet mask

All,
I am trying to figure out how to integrate my MBU-12 O2 mask into my oxygen system in the RV. I already use the standard HGU-68 helmet but would also like to implement the mask/Comm. If you have done this or know of a place that I can look into, I would appreciate it. Forced O2 not required.

Thank you for any help.
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Old 11-21-2017, 07:19 PM
salto salto is offline
 
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Seriously!
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  #3  
Old 11-21-2017, 08:27 PM
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Quote:
Originally Posted by salto View Post
Seriously!
Yes.

Extra words
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Old 11-21-2017, 09:41 PM
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G-force G-force is offline
 
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Perhaps check with Gibson and Barns? Things like the exhalation valves and such my not work without a pressurized system.
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  #5  
Old 11-21-2017, 11:52 PM
Dave_Boxall Dave_Boxall is offline
 
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The MBU-12 is designed for a demand oxygen system (like a scuba mask), not a constant flow system as most GA aircraft use. Demand systems use a LOT of oxygen, up to 25 litres/ minute compared to 2-4 on a constant flow system, and less on a pulsed system.

It'd be a major project to run this mask as a CF system, particularly testing/ verification.
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  #6  
Old 11-22-2017, 12:04 AM
larosta larosta is offline
 
Join Date: Dec 2010
Location: Redlands, CA
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You might want to give the guys over at Human Systems near your facility a call.

FlightHelmet.com has a lot of parts ant they might be able to help. You can also pick up that g suit and ejection seat that you have always wanted.

http://www.flighthelmet.com/

-larosta
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Old 11-22-2017, 06:37 AM
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Saville Saville is offline
 
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I have interest in doing this as well although it's with an MS-20001 and also an A-14. These are Korean War and WWII masks.

The valves are no longer made for these masks and I don't trust old ones. Neither are the metal connectors made. So any system would have to circumvent that whole setup. Plus it uses too much O2 as people say.

So what I was wondering is:

What would be the available O2 at your nose if you ran a modern small flexible hose up through the large mask hose and then placed the cannula across the mask roughly under your nose?

Would you get enough O2? The two outlets of the cannula are not necessarily positioned where they would be if you wore it as designed - maybe an inch away. But then you have the enclosure of the mask to trap unused O2.

But then you are also exhaling through the mask which blows both exhalent and unused O2 out the mask. You can remove the valves so that there's a clear path out.
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Last edited by Saville : 11-22-2017 at 08:21 AM.
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Old 11-22-2017, 11:49 AM
azonic75 azonic75 is offline
 
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Default Someone who will know

Elliot Seguin would know. He uses the set up you are looking for. Don't have his contact info He hangs around Mojave. Share what you find out

kai
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Old 11-22-2017, 12:15 PM
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Maybe someone with a pulse oximeter could test nasal cannula vs mask with nasal cannula in it as described above.

I suspect it will work better than nasal cannula alone.
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  #10  
Old 11-22-2017, 01:54 PM
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Saville Saville is offline
 
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Quote:
Originally Posted by n981ms View Post
Maybe someone with a pulse oximeter could test nasal cannula vs mask with nasal cannula in it as described above.

I suspect it will work better than nasal cannula alone.
I've got a PO. I've been trying to think of a suitable ground and flight test.

Take PO reading without mask

Put mask on, turn on O2, Take PO readings a (?) intervals.

If that's safe then I would take it up to (?) feet and run the same test.
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