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05-29-2010, 09:27 AM
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Join Date: May 2010
Location: Austria
Posts: 14
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Performance RV-9
Hi,
I am an RV builders from Europe from Austria.
I would be interested in the following of you very much:
Motorized How you at? (O-320, IO-320, O-360, IO-360 (180HP, 200HP)
How are your climbing performance?
What are the cruise performance?
And what is the consumption?
I have heard that the RV-7 (180 HP) in the cruise should be almost equal as an RV-9 (160hp). Is that true?
Yours sincerely,
Stefan
Last edited by stefan87 : 05-29-2010 at 09:31 AM.
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05-29-2010, 09:43 AM
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Join Date: Apr 2005
Location: KSLC
Posts: 4,021
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Quote:
Originally Posted by stefan87
Hi,
I am an RV builders from Europe from Austria.
I would be interested in the following of you very much:
Motorized How you at? (O-320, IO-320, O-360, IO-360 (180HP, 200HP)
How are your climbing performance?
What are the cruise performance?
And what is the consumption?
I have heard that the RV-7 (180 HP) in the cruise should be almost equal as an RV-9 (160hp). Is that true?
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My (0-360) 180 HP RV6A is close to 20 mph faster than a 160 equipped 9A. We both have C/S props. I can also climb faster. But the 9A with a 160 does rather well in climb. We fly out of airports in the 4600' elevation range, and usually fly between 7500 - 9500' msl.
The 9A with the 160 does well on fuel consumption. However, if I fly slower for best fuel management, I can usually do as well. I just don't like flying that slow.
I have not flown my 6A against a 7 for enough time to really evalute the differences between these two. I just know that the 6 is quite close to the 7 performance wise.
L.Adamson
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05-29-2010, 09:47 AM
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Join Date: Jul 2007
Location: Delta, CO/Atlin, BC
Posts: 2,391
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Stefan,
A lot of this depends on the configuration of the airplane, particularly whether you have a CS prop or not. As a data point, my 9A has an IO360 with a FP Sensenich prop, pitched for cruise (87 inches). Maximum climb rate is about 14-1500 ft/min between 6000MSL and 10000 MSL - not as good a some, but that's with a cruise-pitched prop. My WOT speed at 8000 feet density altitude is just at 200 mph (~2740 rpm).
greg
__________________
Greg Arehart
RV-9B (Big tires) Tipup @AJZ or CYSQ
N 7965A
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05-29-2010, 09:53 AM
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Join Date: May 2010
Location: Austria
Posts: 14
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Thank you for the very fast replys.
And what are the consumption of the:
O-320 inm an RV-9
and the IO-360 (180HP or 200HP)
at thge same cruise speed?
tanks
Stefan
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05-29-2010, 10:06 AM
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Join Date: Jan 2005
Location: Warner Robins, GA
Posts: 1,187
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My RV9 with O-320, wood cruise prop, 2300rpm, leaned out in cruise flight burns not much more than 7 gallons/hr (6.8 to 7.2). I plan my trips using 140kts GPS ground speed as my preferred speed. Climbs are 1500fpm but on hot days I shallow to 500fpm after initial climb to keep CHTs in check.
__________________
Bruce Sacks
RV-9 N659DB - Flying since 7/1/06
Hatz CB-1 - Fabric covering with Polyfiber.
Warner Robins, GA
A&P
APRS KJ4EFS
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05-29-2010, 02:33 PM
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Join Date: Jul 2007
Location: Delta, CO/Atlin, BC
Posts: 2,391
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Fuel burn on my IO360 at 165 mph cruise and leaned properly at 10,000 ft (more or less) is about 6.5 US gallons/hour. My engine is nominally rated at 180 hp and I burn both 100 LL and premium mogas depending on which is available. I see no noticeable difference in performance between the two fuels.
During climb I can burn as much as 12-14 gph. Good thing it gets to altitude rapidly!
greg
__________________
Greg Arehart
RV-9B (Big tires) Tipup @AJZ or CYSQ
N 7965A
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05-31-2010, 03:07 PM
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Join Date: Oct 2008
Location: Lake Country, B.C. Canada
Posts: 2,416
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RV-9a numbers
I bought a very straight, AME-built -9a.
It has all fairings.
low-time 0-320 7.5:1 compression
carburetted with magnetos.
I'm sure everyone's numbers are correct, but for some reason, I don't see the performance some other do.
at 5000' and 2300 rpm, cruise is about 125 kts. at 7 gph.
I have a mild 'climb' prop, metal sensenich, 70 x79 but only see 1000 fpm climb on average, lightly loaded, whether at 75 or 90 kts.
hope this is helpful.
__________________
Perry Y.
RV-9a - SOLD!....
Lake Country, BC
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05-31-2010, 03:22 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by stefan87
Thank you for the very fast replys.
And what are the consumption of the:
O-320 inm an RV-9
and the IO-360 (180HP or 200HP)
at thge same cruise speed?
tanks
Stefan
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Stefan,
Van's only recommends the O-235, O-290, & O-320 for the -9. However, some have put the O-360 on their -9's but I have not heard of anyone installing a 200 hp engine on the -9.
My -9 w/ a 135 hp O-290-D2 would climb at around 1800 FPM with a fixed pitch climb prop on it and cruise at 140 knots/165 mph on 6.5 gph. At gross it would do about 1250 FPM, if I really pushed it.
I'm in the process of replacing that engine with a 180 hp O-360 but will continue to run a fixed pitch prop.
__________________
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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07-08-2010, 06:46 PM
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Join Date: Oct 2008
Location: Schaumburg, IL
Posts: 2,053
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Today I took my plane on a speed run. At 2700 RPM and 8000 DA, I was about 3/4 throttle 71% power and 151 KTAS (174MPH). I feel that this is a bit slow. My fuel burn was about 8.2gph. I had bkn cumulus clouds at my alt so I had to maneuver around a bit. I am going to re-run, but with about 1-2" of throttle left I am thinking that my Catto prop is pitched more for climb. I will say this plane climbs REALLY well. 1900 FPM is no problem and if I climb at Vx I will see 2400. I'd rather have top end though.
Anyone have any thoughts on my performance numbers. Seems slow? I can live with it, but I'd really think that I could get WOT at 8000 DA and be at 2700 RPM?
at 2400 RPM I am about 135 KTAS 2500 about 140
__________________
Tony Phillips
N524AP, RV 9 (tail wheel)
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07-08-2010, 08:44 PM
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Join Date: Feb 2006
Posts: 359
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seems right
Your analysis that is.
It is slow and I would say that the prop needs more pitch.
My '9 has a 160hp O-320 and a Hartzell.
At 8000' DA, Wide Open Throttle, 2500 rpm, I can lean nicely and generate 161-162 knots True at 8 gph. This is very repeatable.
You ought to see it climb with the constant speed. 
__________________
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David Edgemon
RV-9A N42DE
RV-8 N48DE
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