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08-04-2010, 12:07 PM
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Join Date: Jun 2005
Location: Cedar Park, TX
Posts: 3,156
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Real -9A performance numbers
I know we always say Van's published performance numbers are pretty close. I came across someone at Oshkosh that said they were having problems finding real world performance numbers of a -9A. I'm not sure why that would be. Anyway, here are my REAL numbers to and from Oshkosh that I jotted down on my knee board.
RV-9A O-320, one mag, one lightspeed, Hartzell CS prop
1109# empty
cruise at 10000', oat 14c, 12000 DA, 20.3"map, 2350rpm, ~62% power
full throttle, leaned max economy, using a couple notches of carb heat to get the egts more together for leaning.
145kts True, 6.5gph. Speeds previously verified +-1.5kt with three leg gps calc.
It isn't the best that is possible, but it is mine! (at least until the -8 is done)
__________________
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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08-04-2010, 12:41 PM
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Join Date: Feb 2005
Location: N Mn
Posts: 299
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one day ago 8-3, O-320 FP prop

__________________
Frank Karasti
Hibbing, Mn
RV-9A
Flying--------->-
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08-04-2010, 08:02 PM
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Join Date: Jan 2005
Location: MN
Posts: 2,269
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Cruising
Repeatable cruise #'s
Setup: ECI O-320/carb/dual EI/Hartzell
Low cruise(4K) - 130kts true - 5.0gph/20.8in MP/full carb heat/2070 rpm
High Cruise(8-10K) - 150+kts true - ~6.0gph/WOT/partial carb heat/2250 rpm
Really high cruise(12K-13K) - 144kts true ~4.8 gph/WOT/partial carb heat/2250 rpm. Range over 1000nm.....
8500ft on the 3rd anniversary of first flight

__________________
Cheers,
Pete
Amateur Plane - RV-9A N789PH - 2350+ Hrs
Amateur Radio - KD0CVN
Doggies Delivered - 25+
St. Paul, MN
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08-04-2010, 10:51 PM
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Join Date: Jul 2007
Location: Delta, CO/Atlin, BC
Posts: 2,391
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Here are the data from my POH based on several runs at 8500 elevation. These are data from the engine leaned about 50 degrees past peak. Max speed at 8500 feet is 200 mph WOT turning 2750 rpm.
TAS RPM MAP Fuel Flow % Power
195 2700 23.0 11.3 82
185 2600 21.8 10.0 75
176 2500 20.8 8.7 68
167 2400 19.9 7.6 62
159 2300 19.0 6.7 55
Typical cruise for me is at 12500 or higher and I run about 170 TAS at 2400 RPM and burn 6.4 gph.
Note that I'm running a Superior IO-360, dual mags. My prop is pitched at 87 inches.
greg
__________________
Greg Arehart
RV-9B (Big tires) Tipup @AJZ or CYSQ
N 7965A
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08-05-2010, 01:25 AM
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Join Date: Mar 2005
Posts: 5,685
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Soon there will be two racing data points
Two RV-9As are entered in the Great Canadian Air Rally on August 21. These are the first ever RV-9s in an SARL race. It will be very interesting to see how they do. I would have expected something in the 160 kt range but Greg's max number says they may well be in the 170s (200 mph).
Bob Axsom
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12-17-2010, 03:02 PM
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Join Date: Dec 2010
Location: Vacaville, CA
Posts: 167
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Thought you might enjoy some numbers from my Eggenfellner powered 9A. It was built by Bruce Cruickshank (now half owner with me) and has been flying for about 4 years. We have 314 Hours on it and it's been relatively trouble free. Engine is 2.5 liters Single Overhead Cam and normally aspirated. It has a 2.02 to 1 gearbox turning an electically adjustable Warp Drive prop.
Top speed: 173 KTS @ 11.3 GPH
Cruise speed: 150 KTS @ 7.0 GPH
Econ cruise: 140 KTS @ 6.2 GPH
These numbers are pretty good for an Auto conversion. We burn 91 octane auto fuel at home station.
-Andy Simpkinson
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12-17-2010, 03:23 PM
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Join Date: May 2005
Location: Canby, Oregon
Posts: 1,786
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173 kts, very nice Andy.
Quote:
Originally Posted by simpkinsona
Thought you might enjoy some numbers from my Eggenfellner powered 9A. It was built by Bruce Cruickshank (now half owner with me) and has been flying for about 4 years. We have 314 Hours on it and it's been relatively trouble free. Engine is 2.5 liters Single Overhead Cam and normally aspirated. It has a 2.02 to 1 gearbox turning an electically adjustable Warp Drive prop.
Top speed: 173 KTS @ 11.3 GPH
Cruise speed: 150 KTS @ 7.0 GPH
Econ cruise: 140 KTS @ 6.2 GPH
These numbers are pretty good for an Auto conversion. We burn 91 octane auto fuel at home station.
-Andy Simpkinson
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What is the rated hp of your subie?
Kent
__________________
Kent Byerley
RV9A N94KJ - IO320, CS, tipup
AFS 3500, TT AP, FLYING....
Canby, Or
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12-17-2010, 03:58 PM
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Join Date: Nov 2006
Location: Albuquerque
Posts: 297
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-9A performance
I'm still in Phase 1 sorting some of these things out. I don't have the wheel fairings on yet.
The best TAS I've seen is about 148 kts @ 10,500. I think my fuel burn was about 7 gph. The RPM was about 2450. GPS ground speeds at different headings show about the same.
I can't test at higher power settings because my field elevation is 6550' but I think the best speed I'll see around these parts is about 150 kts or maybe alittle more when I get all the fiberglass on.
Looks like a reasonable cruise speed for me might be around 140 - 145 kts or so.
150 HP, fixed wood cruise prop, 1044 empty.
Not the fastest RV but I'm very happy so far.
Dave
-9A flying
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12-17-2010, 05:28 PM
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Join Date: Mar 2008
Location: Reno NV
Posts: 542
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Real -9A performance numbers
Guys: I did a performance run run yesterday at 8000' PA.
RPM KTAS FF %Pwr NM/Gal
2000 115 3.8 32 30.2
2100 125 4.7 38 26.5
2200 130 5.5 43 23.6
2300 137 6.7 53 20.4
2400 145 7.3 57 19.7
2500 152 8.3 64 17.9
2600 159 10.0 72 15.9
2700 162 11.5 82 14.0
O-360-A4M, Sensenich 72x83 metal prop, 670 hours on engine and airframe, Slick mags, leaned to 50' ROP and 91 mogas. Dan
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12-17-2010, 05:41 PM
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Join Date: Dec 2010
Location: Vacaville, CA
Posts: 167
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Eggenfellner claims 160 HP for our motor. This is also what Subaru claims for that engine. We don't spin it fast enough to get that and with the intake manifold it probably wouldn't get that anyway. We estimate we are getting 140 to 150 HP at 5000 RPM.
-Andy
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