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  #21  
Old 05-05-2014, 09:43 AM
bkthomps bkthomps is offline
 
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recommend in the future you overfly the center of the ATL bravo space, you'll have better results than cutting the arrivals corridor
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  #22  
Old 05-05-2014, 05:25 PM
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YellowPeril YellowPeril is offline
 
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Great post!

That there is some "Git Up And Go!"
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  #23  
Old 05-19-2014, 01:09 PM
AV8AZ AV8AZ is offline
 
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To Bill and MarkW,

What is the highest TAS you can achieve at 12,000+ DA? Highest RPM achievable? I'm curious to know what the IO-320 vs 0-360 with FP props can do at altitude. Any other RV-9s with such >12,000 data points?

Thanks, Tyson
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  #24  
Old 05-19-2014, 02:46 PM
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byoung byoung is offline
 
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Default RV9 wing vs RV7/8 wing

I know that the RV9 wing has a different airfoil section with better low speed performance then the RV7/8 wing, but what would explain the better high altitude performance?
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  #25  
Old 05-19-2014, 02:51 PM
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Ironflight Ironflight is offline
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Quote:
Originally Posted by byoung View Post
I know that the RV9 wing has a different airfoil section with better low speed performance then the RV7/8 wing, but what would explain the better high altitude performance?
Higher aspect ratio.
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  #26  
Old 05-19-2014, 02:56 PM
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byoung byoung is offline
 
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Default Right!

Higher aspect ratio: I should have known that from all those aerodynamics classes I took in school...
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  #27  
Old 05-19-2014, 03:36 PM
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MarkW MarkW is offline
 
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I don't seem to get any better speed because of the lost manifold pressure.
I loose IAS but True says about the same.
I can fly WOT, lop and it is 155 kts about 2500 rpm.
Interesting is wind direction though. I flew from Orlando to Charleston Friday and had a tail wind coming and going just because I was able to pick my altitude.
Going North in the morning wind was 310 down low but as you climb wind moved to about 240. This gave me a 20 knot tailwind most of the trip @ 11k. On the trip home that evening/night is was about the same so I flew lower @ 8k. Tailwind during part of the trip. Even @ 8k we used O2 because we had it and it was dark thirty by the time we landed.
Higher without the advantage of wind doesn't make me faster but it reduces fuel consumption. If I remember @ 11k I was WOT and 63% power. Running about 6.5 gph. Lower and same speed @ 80% power and I would burn 8 gph.
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  #28  
Old 05-19-2014, 04:20 PM
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N941WR N941WR is offline
 
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Quote:
Originally Posted by MarkW View Post
I don't seem to get any better speed because of the lost manifold pressure.
I loose IAS but True says about the same.
I can fly WOT, lop and it is 155 kts about 2500 rpm.
The difference between Mark's IO-320 and my O-360 is that I typically run mine at 50% power LOP (Love my P-mags!), burning 6.1 GPH, and truing at155 Kts at 8500'. (My pictures indicate 20.8" MAP & 2500 RPM at 10,430 DA.)

Quote:
Originally Posted by MarkW View Post
....
Higher without the advantage of wind doesn't make me faster but it reduces fuel consumption. If I remember @ 11k I was WOT and 63% power. Running about 6.5 gph. Lower and same speed @ 80% power and I would burn 8 gph.
The O-360 will drink more fuel but then I can also go faster. I just returned to Houston yesterday and was trueing out at 165 kts while burning around 8 to 9 GPH. (I didn’t take pictures but did use the SkyView to do some screen grabs and those pictures on the flash drive, which is sitting in the plane.)
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  #29  
Old 05-19-2014, 04:31 PM
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My goodness Bill, you're just now getting around to exploring the -9's lovin' for way up top? Come on in, the water is fine...

Vlad, your map is turned the wrong way! Don't you know North is always Up.
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  #30  
Old 05-19-2014, 04:55 PM
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N941WR N941WR is offline
 
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Quote:
Originally Posted by scard View Post
My goodness Bill, you're just now getting around to exploring the -9's lovin' for way up top? Come on in, the water is fine...
Scott, you are going to hate that -8 because it just doesn't do that well up high. I suggest you let me come take it off your hands. How does 20 bucks sound?
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RV-9 (Yes, it's a dragon tail)
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