[simpits-tech] Cockpit builders quote....

[Joseph Fagner]

IIRC, one atmosphere measured in a column of water is 14 psi, adding 5-10
psi through a mask would hardly blow it off your face.  I can generate 5-10
psi (probably more) just blowing up a balloon.

If you think about the combat edge system, you'd need more than 1.2 psi
generated in a high G situation to even be able to breath.  The breathing
system of any jet will generate similar pressures (relatively speaking,
probably not exactly similar but the mechanism is analogous) to that of a
scuba system since you are dealing with having to expand the chest cavity
against an opposing force...G's for the pilot, pressure for the diver.

Finding the conversion for 1 atmosphere to in-H20 is 407.  So this manual
says a pilot shouldn't breath at pressure above 16 in-H2o, yet I'm breathing
at 407 in-H2o right now??

I'd double check those figures.

Jay

-----Original Message-----
From: simpits-tech-bounces at simpits.org
[mailto:simpits-tech-bounces at simpits.org] On Behalf Of Scott
Sent: Sunday, March 25, 2007 11:27 PM
To: Simulator Cockpit tech list
Subject: Re: [simpits-tech] Cockpit builders quote....


----- Original Message -----
From: "Joseph Fagner" <falcon4 at sbcglobal.net>
To: "'Simulator Cockpit tech list'" <simpits-tech at simpits.org>
Sent: Saturday, March 24, 2007 4:32 AM
Subject: Re: [simpits-tech] Cockpit builders quote....


> I would be sure that it's really properly filtered as there is a bunch of
> stuff in that air that would not be nice to your lungs.  Being a scuba
> diver, I decided using a scuba tank and a low pressure port from the
primary
> reg will be the way to go for me.  Low pressure primaries are around 150
> psi.  You can regulate that down to a nice 5-10 psi for the O2 mask.


5-10psi??   I have the current patent paperwork for the newest mask/g-suit
test kit...
Built to test the MBU-12/20 mask...  this is pulled directly from the
patent:

"...When the g-suit is not inflated, it is dangerous to breathe air at
pressures much above 16in/H2O."

Using a IN/H2O to PSI Conversion chart it is 0.5774psi.  5-10psi would blow
the mask off your face, or worse...

Continuing from the patent:

"When performing COMBAT EDGE testing, it is necessary to expose the user to
excessive breathing pressures.
Exposure to excessive breathing pressure can hurt the user.  It is only safe
under curtain conditions and
for limited periods of exposure.  Under no circumstances should the
breathing air pressure exceed 34 IN/H2O."

Converting 34 IN/H2O = 1.227psi...  (FYI - Combat Edge is the new positive
pressure system)

I currently do not have much other than CAD drawings of my cockpit done, I
have however put extensive time
picking up oddball parts (like my TTU-529/E test kit) in the hopes of
pulling out the parts to connect and use
the MBU-12 and CSU-13 g-suit with...  I couldn't find ANY literature for a
long time on the pressures being supplied
to the MBU-12, until I located this patent...   if anyone out that has
anything else or corrections, please send them!

I know we used a DeVilbiss dryer on the line in the shop.  What was after
that i cannot say for certain, the co-owner
still has the filters, and when I see her tomorrow I will get exact part
numbers for you...  it wasn't that expensive, and
with a new compressor dedicated to breathing air, and clean dry air for the
spray guns, we were up to code...

More to follow!  -- Scott

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