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  #1  
Old 11-18-2021, 05:49 PM
Traash Traash is offline
 
Join Date: Apr 2007
Location: Montgomery, TX
Posts: 69
Default FL250

In case you want to see the numbers of a RV-10 @ FL250.

Last week I needed to fly from KCXO to KOSH, a distance of 880 NM. Normally I would stop enroute but the winds at altitude beckoned. I filled for 17,000'. The tailwinds were stronger, the fuel flow lower and the mpg was higher the higher I climbed. I found myself asking Center for higher and higher and ended up at FL250 which made it possible to fly the route non-stop on 47 gallons of fuel. The picture shows the cruise numbers. I didn't start out to go that high so I didn't record any other data as a true test flight would. It just happened that conditions were perfect to see what she would do.

Conditions:
Lightweight (solo, no cargo, 35g fuel @ TOC), Cold (ISA +3*), Strong tailwinds, No clouds or turbulence, Full Oxygen and mask available, Destination VFR, Traveling from high to low pressure (slight descent in the flight levels), No traffic.

Equipment:
Thunderbolt IO-540, 9.1 pistons, 2 Slick mags, Airflow Performance fuel servo, 2 blade Hartzell prop, standard fuel tanks (60g), Mountain High EDS-4ip Oxygen.

Performance:
Final climb rate: 150fpm @ 90kias (140ktas)
Leaned to Max power (75* ROP)
Maintained 160ktas thru FL200

If you want to test your aircraft to it's service ceiling remember that the canula breathing method is only good to 18,000'. You need a mask above that to 25,000'. Above that you need pressure breathing.

As you can see, a stock RV-10 is a great x-country aircraft. I can't thank Van enough for designing such a capable machine and making it possible for me to build it.

Note: Had to stop on the way home. Luckily the winds had shifted Westerly and we're merely 70k crosswinds.
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  #2  
Old 11-18-2021, 10:02 PM
Taltruda Taltruda is offline
 
Join Date: Oct 2017
Location: Las Vegas, NV
Posts: 986
Default

That’s awesome! Less than 10 inches of MP lol! How does the mic work through the mask?
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  #3  
Old 11-18-2021, 10:05 PM
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newt newt is offline
 
Join Date: Jan 2011
Location: Sydney, Australia
Posts: 435
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Quote:
Originally Posted by Taltruda View Post
That’s awesome! Less than 10 inches of MP lol! How does the mic work through the mask?
You're expecting sound to carry without air molecules to vibrate?

- mark
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  #4  
Old 11-19-2021, 08:21 AM
Traash Traash is offline
 
Join Date: Apr 2007
Location: Montgomery, TX
Posts: 69
Default

Not well. Need to order the mask with mic.
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  #5  
Old 11-19-2021, 09:02 AM
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Ironflight Ironflight is offline
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Location: Dayton, NV
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So if an RV-10 and an F1 Rocket leave Houston at the same time, headed for Oshkosh, and the RV-10 flies at FL250, who gets to Mahoney’s first?
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  #6  
Old 11-19-2021, 10:01 AM
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Special Delivery Special Delivery is offline
 
Join Date: Feb 2007
Location: League City, TX
Posts: 618
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Quote:
Originally Posted by Ironflight View Post
So if an RV-10 and an F1 Rocket leave Houston at the same time, headed for Oshkosh, and the RV-10 flies at FL250, who gets to Mahoney’s first?
On this particular flight to OSH, the F-1 (my neighbor) flew commercial and my best guess is that by the time he arrived Traash was trashed and Mahoney's was closing!
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  #7  
Old 11-19-2021, 10:21 AM
Ralph Inkster Ralph Inkster is offline
 
Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 1,659
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Q: What would be the effects on regular Slick mags if subjected to sustained or regular operation at these heights?
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  #8  
Old 11-19-2021, 10:26 AM
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Dan 57 Dan 57 is offline
 
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Location: LSZF
Posts: 864
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2.4° AOA in cruise... is that a normal value? Flaps reflexed?
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  #9  
Old 11-19-2021, 06:42 PM
Traash Traash is offline
 
Join Date: Apr 2007
Location: Montgomery, TX
Posts: 69
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Got there early enough to drive to Fisk for a refreshing S. Cow at Wehrmann's on the tracks. Yes... The tracks North of Ripon.
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  #10  
Old 11-19-2021, 07:10 PM
Traash Traash is offline
 
Join Date: Apr 2007
Location: Montgomery, TX
Posts: 69
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Quote:
Originally Posted by Dan 57 View Post
2.4° AOA in cruise... is that a normal value? Flaps reflexed?
Normal. Flaps up (reflexed). Note the -3* indication.

The extended level horizon is the white line.
The simulated green terrain is -2.5* due to the altitude (curvature of the Earth).
The green segmented circle is the Flight Path Vector (FPV). Where the airplane is traveling. (Offset right due to left crosswind component).
The tip of the two yellow chevron's is the nose. Where the airplane is pointed.
AOA is represented by the angular difference between the FPV and the nose. Not that you would do this in flight but if you measure the picture you'll calculate 2* AOA. Quite normal for cruise. Stall occurs just before 15* AOA.
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