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11-27-2011, 06:09 PM
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Join Date: Jun 2007
Location: Auckland, New Zealand
Posts: 13
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I have had my RV7a to FL200 a few times.
It's running a 180HP engine and the plane is still climbing at 400fpm at that height with just me on board.
I won't go above that height in case my O2 decides to stop working.
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11-28-2011, 12:44 PM
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Join Date: Sep 2006
Location: STL/3K6
Posts: 399
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Quote:
Originally Posted by mkburcar
Guys,
I had to chime in on this one. I completely understand the excitement and gratification in exploring the performance of your home built airplane. But I don't see the point in trying to play Wiley Post in a RV.
These are spectacular performing, fun airplanes. Why jeopardize that by trying to take them somewhere they really are not meant to go? High altitude is no where to play around and there are not a lot of "good" ways to get back down quickly either.
Have fun and fly safe.
Mark
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Getting down fast: spins are safe and fast? Couple thousand feet per minute and no risk of bending the airplane.
Oxygen masks and pulse oximetry are easy to come by.
http://www.amazon.com/HCS4600H-Medli.../dp/B000TQET9S
http://www.amazon.com/Contec-CMS50L-.../dp/B002BUYSDC
Placing the nasal canula in your mouth, close lips, and breathing through your nose will work fine for a one off flight too. Your mouth, oral pharynx, nasal pharynx, and hypo pharynx act as a large O2 reservoir. Flame on if you like, respiratory physiology is kind of my thing though.
I wouldn't do this flight without a pulse ox regardless of Oxygen delivery method.
Plan it right, do it smart, come back and report your findings. This type of flight is on my to do list as soon as I find a fill source for my new O2 bottle.
__________________
RV-8, Both wings with top skins on
-4 bought flying
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11-28-2011, 09:13 PM
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Join Date: Jun 2007
Location: Atlanta
Posts: 745
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Quote:
Originally Posted by grantcarruthers
Getting down fast: spins are safe and fast? Couple thousand feet per minute and no risk of bending the airplane.
Oxygen masks and pulse oximetry are easy to come by.
http://www.amazon.com/HCS4600H-Medli.../dp/B000TQET9S
http://www.amazon.com/Contec-CMS50L-.../dp/B002BUYSDC
Placing the nasal canula in your mouth, close lips, and breathing through your nose will work fine for a one off flight too. Your mouth, oral pharynx, nasal pharynx, and hypo pharynx act as a large O2 reservoir. Flame on if you like, respiratory physiology is kind of my thing though.
I wouldn't do this flight without a pulse ox regardless of Oxygen delivery method.
Plan it right, do it smart, come back and report your findings. This type of flight is on my to do list as soon as I find a fill source for my new O2 bottle.
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OK, If you're up in IF&R territory, how do you talk to ATC with the canula in your mouth? 
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11-29-2011, 07:02 AM
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Join Date: Sep 2006
Location: STL/3K6
Posts: 399
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If you can fly a plane, this modest challenge ought not be too daunting. If its a challenge you don't care to take I provided a link to a mask too. I brought it up as an option that can be used in a pinch if youre caught without a mask some day or perhaps for one brief flight above normal cannula altitudes.
Keep in mind this is serious stuff though
http://en.wikipedia.org/wiki/Time_of..._consciousness
__________________
RV-8, Both wings with top skins on
-4 bought flying
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11-29-2011, 07:31 AM
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Join Date: Jan 2005
Location: Georgia / 0GE5 / KSSI
Posts: 399
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I have an oxygen system in my 8 that isn't being used.
I have flown gliders over 28000' and never worried about cracking the canopy. It was -30 at that altitude most times.
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George
"God does not deduct from one's time on earth that which is spent in the air."
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11-29-2011, 08:07 PM
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Join Date: Jun 2007
Location: Atlanta
Posts: 745
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Quote:
Originally Posted by grantcarruthers
If you can fly a plane, this modest challenge ought not be too daunting. If its a challenge you don't care to take I provided a link to a mask too. I brought it up as an option that can be used in a pinch if youre caught without a mask some day or perhaps for one brief flight above normal cannula altitudes.
Keep in mind this is serious stuff though
http://en.wikipedia.org/wiki/Time_of..._consciousness
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Grant, I looked at this TUC table you showed. I and my classmates did the high altitude chamber when I was in the military. Best I recall, you have only " 20 to 30 seconds" of useful consciousness above 18000', NOT 20 to30 minutes as it says here!!!!!!! And we were all in our early 20ties. I wouldn't trust this chart for a minute. Please do not try this. Have a full face mask.
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11-29-2011, 08:46 PM
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Join Date: Sep 2006
Location: STL/3K6
Posts: 399
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Sorry, when I did the altitude chamber in the military it wasn't quite that dramatic.
__________________
RV-8, Both wings with top skins on
-4 bought flying
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07-11-2012, 01:45 PM
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Join Date: Jan 2006
Location: Belgium
Posts: 645
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High altitude test flight!
Hello guys,
Re-opening this thread! I just had to find out how high my RV-9A will fly! It is equiped with an OX-320 and CS prop.
It took two attemps before I was allowed to go "all the way". I tried it in Belgium first, although ATC said (over the phone) that for testing purposes they would allow me to climb to FL240, ones airborne on the day of the event, they would not let me go higher than FL195 (max VFR Alt. in Belgium).
So I tried it again in The Netherlands. The Dutch military were a lot more cooperative. I guess they never thought I would get this high!
On the agreed day, I took off from my home base and started climbing in the direction of the Netherlands, while getting approval from "Brussels Info" to contact "Dutch Mil". It is only a few minutes from my base to the Dutch border.
Dutch Mil gave me two points in their Military D-Class airspace, I was supposed to to fly between. My RV-9A was climbing like a homesick angel and when I reached the northern turn-point I still had a lot of climb potention left. When I made the 180? turn, the Trutrak was throwing from left to right, so I went back to hand flying. It turned out that I was actually flying backward, doing something like 100 KTAS and with headwinds exeeding 99 KTS (Dynon EFIS only showing 2 digits of wind velocity), which caused teh AP to oscilate left/right.
Although I was drifting close to the Amsterdam TMA, Dutch Mil let me climb further, till I had to call it a day at: 26.640 ft !!!! when there was just no more potential for climb left. The outside temparture was -30?C, with the canopy freezing over in some area's, on the inside!
This was an adventure I was dreaming about and had to get "out of my system". The oxi bottle I borrowed from the local Drugstore was EUR 2,49 for the fillng, the canula I had to buy for EUR 3,00.
Regards, Tonny.
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"Pilottonny"
Tonny Tromp
Lanaken, Belgium (EU)
RV9A, Registration: PH-VAN
ECI-Titan IOX-320 with dual EI, turning a Whirlwind 200RV CS prop.
Sold
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07-11-2012, 02:30 PM
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Join Date: Sep 2006
Location: STL/3K6
Posts: 399
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Most impressive! Congrats on such a huge success.
__________________
RV-8, Both wings with top skins on
-4 bought flying
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07-11-2012, 02:49 PM
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Join Date: Sep 2010
Location: Charlotte NC
Posts: 1,167
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Quote:
Originally Posted by donaziza
Grant, I looked at this TUC table you showed. I and my classmates did the high altitude chamber when I was in the military. Best I recall, you have only " 20 to 30 seconds" of useful consciousness above 18000', NOT 20 to30 minutes as it says here!!!!!!! And we were all in our early 20ties. I wouldn't trust this chart for a minute. Please do not try this. Have a full face mask.
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20 to 30 minutes is correct at 18K. You are down to 20 or 30 seconds only in a explosive decompression at altitudes above 35K. We took are masks off in the chamber at 24,000 feet and would perform a variety of tasks. Performance would start to go down hill fast after about 2 minutes at that altitude. Here are the standard tables. TUC in these tables means your ability to reasonable perform a task not when you actually pass out.
The table below reflects various altitudes with the corresponding average TUC:[4]
Altitude in Flight level Time of Useful Consciousness Altitude in meters Altitude in feet
FL 150 30 min or more 4,572 m 15,000
FL 180 20 to 30 min 5,486 m 18,000
FL 220 5-10 min 6,705 m 22,000
FL 250 3 to 6 min 7,620 m 25,000
FL 280 2.5 to 3 mins 8,534 m 28,000
FL 300 1 to 3 mins 9,144 m 30,000
FL 350 30 sec to 60 sec 10,668 m 35,000
FL 400 15 to 20 sec 12,192 m 40,000
FL 430 9 to 15 sec 13,106 m 43,000
FL 500 and above 6 to 9 sec 15,240 m 50,000
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