Mountain High Cannula/Mask?

https://www.faa.gov/pilots/training/...%2061-107A.pdf

Page 13 is the table of useful consciousness versus altitude, and is surrounded by a pretty good discussion.

Above 22k, note that the time to descend can be longer than the time to think. So a backup system and being willing and able to come down really fast need to be thought through beforehand.

RR is right, something happens in the 20's. Perhaps the partial pressure of O2 in the blood and air get close?

On Wednesday, October 2, 2019 at 2:02:08 PM UTC-6, wrote:
https://www.faa.gov/pilots/training/...%2061-107A.pdf

Page 13 is the table of useful consciousness versus altitude, and is surrounded by a pretty good discussion.

Above 22k, note that the time to descend can be longer than the time to think. So a backup system and being willing and able to come down really fast need to be thought through beforehand.

RR is right, something happens in the 20's. Perhaps the partial pressure of O2 in the blood and air get close?

This article is quite interesting.
https://www.airspacemag.com/military...eet-117615369/

I have only ever once been above 20k, and on all other occasions have usèd a canula apparently successfully. On that occasion I was planning to go higher and so used the mask which came with my EDS kit. It didn't seal well and I felt I had to keep pressing it against my face. I suggest trying out your equipment in advance of a flight where you expect to go high.

Of note:

I was going a good job with my cannula. I kept an eye on my pulse ox, things were going well.

Started eating some trail mix for lunch.... oh yeah, mouth breathing. Pulse Ox was headed south in a hurry.

Just something to think about. I had to be extra vigilant to not stuff my face all at once, and when taking time to drink and eat... consciously make sure to take good hits off the O2 with my nose.

JP

At 08:09 12 October 2019, wrote:
Of note:

I was going a good job with my cannula. I kept an eye on my pulse
ox,
things were going well.

Started eating some trail mix for lunch.... oh yeah, mouth breathing.
Pulse Ox was headed south in a hurry.

Just something to think about. I had to be extra vigilant to not stuff
my
face all at once, and when taking time to drink and eat... consciously
make
sure to take good hits off the O2 with my nose.

JP


Bought an 'FDA Approved' Finger Pulse Oximeter Blood Oxygen
Saturation SPO2 Heart Rate O2 Patient Monitor from fleabay to try out
($25-ish).

Although it was a bit clunky sitting on the end of my finger, it appeared
to work reliably well on the ground (slight overcast?) or airborne under
cloud.

At altitude it repeatedly failed in very bright sunlight. (Measures light
absorption of the blood in your finger)
Whenever I uncovered my hand in bright sunlight to read the display it
immediately lost the plot. Wonderful!

As an experiment I covered the device and part of my finger in the foil
from a snack bar leaving the display (mostly) uncovered, it worked
much better but was even more inconvenient.

Don't buy cheap??! (YMMV)

MR

On Saturday, October 12, 2019 at 7:00:05 AM UTC-4, Maxx Ruff wrote:
At 08:09 12 October 2019, wrote:
Of note:

I was going a good job with my cannula. I kept an eye on my pulse
ox,
things were going well.

Started eating some trail mix for lunch.... oh yeah, mouth breathing.
Pulse Ox was headed south in a hurry.

Just something to think about. I had to be extra vigilant to not stuff
my
face all at once, and when taking time to drink and eat... consciously
make
sure to take good hits off the O2 with my nose.

JP


Bought an 'FDA Approved' Finger Pulse Oximeter Blood Oxygen
Saturation SPO2 Heart Rate O2 Patient Monitor from fleabay to try out
($25-ish).

Although it was a bit clunky sitting on the end of my finger, it appeared
to work reliably well on the ground (slight overcast?) or airborne under
cloud.

At altitude it repeatedly failed in very bright sunlight. (Measures light
absorption of the blood in your finger)
Whenever I uncovered my hand in bright sunlight to read the display it
immediately lost the plot. Wonderful!

As an experiment I covered the device and part of my finger in the foil
from a snack bar leaving the display (mostly) uncovered, it worked
much better but was even more inconvenient.

Don't buy cheap??! (YMMV)

MR

Mine has LEDs and works well. Remember that when you get cold, blood's routed to the core, away from hands/feet, so your reading might be off a bit.

On Saturday, October 12, 2019 at 6:00:05 AM UTC-5, Maxx Ruff wrote:
Bought an 'FDA Approved' Finger Pulse Oximeter Blood Oxygen
Saturation SPO2 Heart Rate O2 Patient Monitor from fleabay to try out
($25-ish).

Although it was a bit clunky sitting on the end of my finger, it appeared
to work reliably well on the ground (slight overcast?) or airborne under
cloud.

At altitude it repeatedly failed in very bright sunlight. (Measures light
absorption of the blood in your finger)
Whenever I uncovered my hand in bright sunlight to read the display it
immediately lost the plot. Wonderful!

As an experiment I covered the device and part of my finger in the foil
from a snack bar leaving the display (mostly) uncovered, it worked
much better but was even more inconvenient.

Don't buy cheap??! (YMMV)

MR

Yes. SoaringRx on pulse ox accuracy
https://www.danlj.org/~danlj/Soaring...-p18-20-22.pdf
Geez! Hard to believe that I wrote that 7 years ago...
and on high-altitude breathing in general
https://www.danlj.org/~danlj/Soaring...ygen-risks.pdf
Enjoy!
DrDan