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05-05-2014, 09:43 AM
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Join Date: Jan 2010
Location: Destin
Posts: 1,543
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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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05-05-2014, 05:25 PM
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Join Date: May 2012
Location: Bowdoinham
Posts: 180
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Great post!
That there is some "Git Up And Go!"
__________________
Nick "Hairball" Knobil
RV8 N80549 (First Flight 2003)
Aerosport O-360A1A, Dual LS CDIs, WW200C
Bowdoinham, Maine
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05-19-2014, 01:09 PM
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Join Date: Nov 2013
Location: Phoenix, Arizona
Posts: 60
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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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05-19-2014, 02:46 PM
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Join Date: Mar 2011
Location: Remond WA
Posts: 32
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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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05-19-2014, 02:51 PM
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VAF Moderator / Line Boy
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Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,256
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Quote:
Originally Posted by byoung
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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Higher aspect ratio.
__________________
Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
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05-19-2014, 02:56 PM
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Join Date: Mar 2011
Location: Remond WA
Posts: 32
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Right!
Higher aspect ratio: I should have known that from all those aerodynamics classes I took in school...
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05-19-2014, 03:36 PM
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Join Date: Sep 2011
Location: Edgewater, FL. KSFB
Posts: 1,118
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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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05-19-2014, 04:20 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by MarkW
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.
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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
....
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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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.)
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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05-19-2014, 04:31 PM
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Join Date: Jun 2005
Location: Cedar Park, TX
Posts: 3,156
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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.
__________________
Scott Card
CQ Headset by Card Machine Works
CMW E-Lift
RV-9A N4822C flying 2200+hrs. / Cedar Park, TX
RV8 Building - fuselage / showplanes canopy (Done!)
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05-19-2014, 04:55 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by scard
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...
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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?
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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