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09-28-2011, 10:55 AM
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Join Date: Sep 2006
Location: STL/3K6
Posts: 399
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My $35 unit shuts off after just a few minutes and runs on AAA batteries which are cheap and easy to find. I just changed the batteries for the first time in 2 years but I don't use it that often either. I keep it velcroed to the tunnel in easy reach.
As long as the battery isn't an expensive specialty battery it probably isn't much of a concern???
Do you guys monitor continuously or just do spot checks once in awhile. Only reason I can think of to use continuously in flight is as a warning to O2 system failure or depletion. If I was really high where time of useful consciousness was short I'd run continuous I guess. Below 18000 I'd just use it to titrate O2 flow to a happy SaO2 value and then just spot check every 30 minutes when I change tanks and do my 30 minute flight scan/reassessments.
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RV-8, Both wings with top skins on
-4 bought flying
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09-28-2011, 10:59 AM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,436
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Quote:
Originally Posted by grantcarruthers
Bottom line, find a cheap source of oxygen so you'll use it liberally.
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Out here, a portable oxygen bottle is filled for less money than one installed in an airplane. The cost per fill is the same regardless of the size of the bottle, so it pays to have a large bottle that's portable.
Dave
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09-28-2011, 11:03 AM
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Join Date: Sep 2005
Location: Dothan, Alabama
Posts: 1,487
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__________________
Alton DeWeese
N526RV RV7A Tip Up, IO360 180 W/Hartzel BA prop.
Flying ~950 hours since Aug 2010
N4IDH
Construction Log
?The secret of getting ahead is getting started. The secret of getting started is breaking your complex overwhelming tasks into small manageable tasks, and then starting on the first one.?
?Mark Twain
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09-28-2011, 05:04 PM
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Join Date: Jan 2008
Location: Ashland, OR
Posts: 2,574
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see my post #14 on altitude error of pulse-Ox meter
Anyone else have a similar experience to what I mentioned in post #14?
If my particular meter, or brand, was bad, and its not a general trend, then I may consider buying a new one.
I became pretty convinced its indications at altitude were meaningless when I turned the O2 on in my glider and my SaO2 only went from 86 to 88.
Its also pretty strange to be out hiking in the mountains, feeling great, and the stupid meter says 86.
Just curious if anyone else has had a meter that seemed to be affected by altitude.
__________________
Steve Smith
Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
WW 200RV
"The Magic Carpet"
Hobbs 625
LS6-15/18W sailplane SOLD
bought my old LS6-A back!! 
VAF donation Jan 2020
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09-28-2011, 05:28 PM
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Join Date: Jan 2005
Posts: 230
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cheap pulseOxs
Altitude should have no effect on the function of the pulse ox. Take it with you to your doctors office and compare it to theirs. if it's close there it should be good. Some pulse ox trivia is they are fooled by carbon monoxide, so don't expect the sat reading to go down if you're being poisoned by an exhaust leak.
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Bill Grischo, Gilbert AZ
N911WG RV-6A DVT
Flying, thinking about polishing
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09-28-2011, 07:44 PM
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Join Date: Dec 2008
Location: Big Sandy, WY
Posts: 2,567
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This is pretty good O2 sat info, just one problem for me. Apparently I need a portable bottle on my saddle & one on my backpack frame. It also means I should be on ox when I go up to cut firewood. Can't I just put out my cigarette and chew some coca leaves instead? I guess I'm really asking how high altitude people have adapted. Do they live on lower sat levels or does their cardio system compensate & keep them in the nineties? How do it work?
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Actual repeat offender.
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09-28-2011, 08:36 PM
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Join Date: Nov 2007
Location: Waukesha, Wisconsin
Posts: 554
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I manage 300 pulse oximeters in the US Air Force. Our units cost $700 each. Not because they are gold plated but because they are made for extreme environments. Uneffected by pulling G's, poor blood flow from cold fingers etc. I doubt your sensor is as accurate and ill tell you my guidance.
An O2 saturation of 90% equates roughly to 10,000 ft for someone acclimated to sealevel. Regardless of FAR oxygen requirements, you are O2 defiecient above 10,000 ft and have degrade performance even below this. Just because you dont feel hypoxic doesnt mean your not missing radio calls, missing traffic and far more fatigued than you should be. Keep your O2 sat above 90%. If your acclimated to high altitude 90% may occurr a little higher than 10K. Someone living at 6K will normally get 2-4% benefit in O2 sat.
I just briefed a four star general today about the risk of relying on a pilot degraded by hypoxia to sense his state of hypoxia.
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Paul 'Bugsy' Gardetto, Col, USAF (ret)
Milwaukee, Wisconsin (Timmerman Field)
N377KG - Flying (250 hrs)
RV-7A, Aerosport O-360, WW200RV
Advanced Flight 5400
Avidyne IFD440
Paint by planeschemer.com
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09-28-2011, 08:47 PM
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Join Date: Dec 2008
Location: Big Sandy, WY
Posts: 2,567
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Quote:
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Someone living at 6K will normally get 2-4% benefit in O2 sat.
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So, someone living in Leadville has acclimated to the point where their resting sats are over 90? Is this done through higher pulse, respiration, BP, or some combination?
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Actual repeat offender.
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09-28-2011, 10:09 PM
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Join Date: May 2010
Location: Denver
Posts: 564
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Quote:
Originally Posted by aerhed
So, someone living in Leadville has acclimated to the point where their resting sats are over 90? Is this done through higher pulse, respiration, BP, or some combination?
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Aerhed,
People living in Leadville do have somewhat higher pulse and respiratory rates, but the primary mechanism is an increase in the number of red blood cells. This turns out to be a mixed blessing though, as it causes thicker blood(think heavy weight oil). Many Leadville residents eventually develop pulmonary hypertension after years of pumping thickened blood, and by middle age may have to move to lower elevations.
Peruvians and Nepalis living at even higher elevations do all of the above, but also appear to have developed over generations certain biochemical adaptations.
Jim Berry
RV-10
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09-29-2011, 04:52 AM
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Join Date: Nov 2007
Location: Waukesha, Wisconsin
Posts: 554
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All true
I was at an indian air force base in the himalayas on the pakistan border. Air base at 25,000 ft (long runway). We brought a pulse ox. At 18,000 our sherpa driving the jeep had an O2 sat of 97. We were weezing in the 80s, taking medication called diamox to assist. They clearly had generational adaptations. The indian AF folks i talked to complained of learning dissabilities for their children brought as accompied family members to the nearby town of Leigh.
Lesson i guess is that you might be acclimatized to high altitude and able to fly higher than 10k while keeping your O2 sat above 90. Or you might be pushing 50 or older and weezing at ground level. In iether case your compromizing safety with an O2 sat below 90.
__________________
Paul 'Bugsy' Gardetto, Col, USAF (ret)
Milwaukee, Wisconsin (Timmerman Field)
N377KG - Flying (250 hrs)
RV-7A, Aerosport O-360, WW200RV
Advanced Flight 5400
Avidyne IFD440
Paint by planeschemer.com
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