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  #11  
Old 11-29-2015, 05:02 AM
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Quote:
Originally Posted by BobTurner View Post
I'll bet density altitude is routinely on the high side?
yeah, it can often be 2000' higher, no different to the USA in summer.
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  #12  
Old 11-29-2015, 12:14 PM
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Originally Posted by cmgolden View Post
Indeed I was solo. Outside air temp at FL230 was -24C (which is a bit warmer than standard, I think). I had about 40 gallons at altitude. Density altitude was not quite FL240.
Standard temp at this altitude would be -31C, so yeah, you were 7C warmer than standard. Also, and I'm sure you know this already, service ceiling is where you can no longer maintain a 100" per minute rate of climb. Absolute ceiling is where your airplane says Gasp Gasp----I just can't go no higher.
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  #13  
Old 08-07-2017, 09:49 AM
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Default OX Mask?

Do you have a mask with a mic or do you just pull it away from your mouth to respond to ATC?
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  #14  
Old 08-07-2017, 09:58 AM
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At the end of my flyoff of Phase I, the way home from my first cross country trip I did the same. About the same numbers but I did not record them. 23000 feet was climbing at 150-200fpm. Cooling was the limiting factor in the climb.

IFR flight plan, O2 mask, and O2 pulse sensor.

Only time I have been above 15k since. normal cruise is 11,500-12,499 to stay below O2 need.
Pulled my mask to talk to ATC


Fun experience though. Nice Chris
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  #15  
Old 08-07-2017, 06:07 PM
BobTurner BobTurner is offline
 
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Default Trivia question

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Originally Posted by bill@fusion4.net View Post
Only time I have been above 15k since. normal cruise is 11,500-12,499 to stay below O2 need.
Trivia Q: Sometimes you can fly at 12,501' for hours and be legal; sometimes you cannot even at 12,499', because the FARs state "...above 12,500 PRESSURE altitude"...
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  #16  
Old 08-09-2017, 02:40 AM
paul330 paul330 is offline
 
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Just bear in mind that anything over 18,000 risks decompression sickness - "the bends".....
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  #17  
Old 08-09-2017, 05:28 AM
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Originally Posted by paul330 View Post
Just bear in mind that anything over 18,000 risks decompression sickness - "the bends".....
Wait what? Do you have data supporting that? In WWII tens of thousands of airmen went up every day into the flight levels in unpressurized aircraft and I don't recall reading that decompression sickness was an issue.
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  #18  
Old 08-09-2017, 07:26 AM
BrianDC BrianDC is offline
 
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Originally Posted by Auburntsts View Post
Wait what? Do you have data supporting that? In WWII tens of thousands of airmen went up every day into the flight levels in unpressurized aircraft and I don't recall reading that decompression sickness was an issue.
I was about to scoff at this, but there is a hint of truth I guess:
https://www.avweb.com/news/aeromed/181939-1.html
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  #19  
Old 08-09-2017, 07:33 AM
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Quote:
Originally Posted by BrianDC View Post
I was about to scoff at this, but there is a hint of truth I guess:
https://www.avweb.com/news/aeromed/181939-1.html
I agree it's most certainly possible and has happened, I'm just not sold on the level of risk below FL250 for RV's as the climb rates at those altitudes are anything but what can be characterized as "rapid ascent". Nevertheless I concede the risk is not zero.
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Last edited by Auburntsts : 08-09-2017 at 07:36 AM.
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  #20  
Old 08-10-2017, 07:40 AM
paul330 paul330 is offline
 
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As the article shows, the risk is greatest over 25k. However, I woudn't go scuba diving and then fly at 20k......
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