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  #1  
Old 12-29-2018, 03:18 PM
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N941WR N941WR is online now
 
Join Date: Jan 2005
Location: SC
Posts: 11,807
Default RV-9 performance

My O-360 powered -9 taildragger spinning a fixed pitch Catto prop will cruise right at 175 knots at 8,000 feet density altitude at 75% power.

On Christmas day I spent some time exploring the lower end of the performance spectrum.

Short field:
Within 900' from the end of a runway on a no wind 60įF day, not my touchdown point, I was able to land and take off again. That was land, stop, raise the flaps, adjust the trim and take off in less than 900 feet. Since I floated past the end of the runway, I absolutely believe Van's numbers.

Optimal cruise:
On that same flight I thought I would see what my optimal extended range speed would be.

It turns out that 40% power gives me 135 knots running while burning 4.8 GPH LoP.
This works out to 28 GPH gives me a range of over 1000 NM.

What numbers are the rest of you seeing?
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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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  #2  
Old 12-29-2018, 03:33 PM
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grubbat grubbat is offline
 
Join Date: May 2012
Location: Ga
Posts: 599
Default Too fast

Bill,
You need to read the article about putting that super big engine on your -9 and stay below 156kts. Shame shame shame.😄

On a serious note, 28mpg is pretty good. Was that on a three-way gps course? The Cafe report on the -9 showed 30mpg but I havenít been able to get that yet.
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RV-3 Sold
RV-4 Sold
RV-6a Sold
RV-9 IO-360 CS, Built and Flying
Comanche 260 - poor mans RV-10
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  #3  
Old 12-29-2018, 03:49 PM
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N941WR N941WR is online now
 
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Default

Quote:
Originally Posted by grubbat View Post
Bill,
You need to read the article about putting that super big engine on your -9 and stay below 156kts. Shame shame shame.😄

On a serious note, 28mpg is pretty good. Was that on a three-way gps course? The Cafe report on the -9 showed 30mpg but I havenít been able to get that yet.
I can't read, I thought you knew that Craig!

The average of three 75% power runs; however, for my efficiency runs, I was looking at TAS, % power, and fuel flow. I was wondering what my numbers would be with the larger engine.
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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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  #4  
Old 12-29-2018, 05:07 PM
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JohnInReno JohnInReno is offline
 
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Location: Prescott Valley/Chandler AZ
Posts: 310
Default 10-320 9A

The formatting is hard to read but the bottom line numbers are:

ROP 164.9 kts at 9.4gph

LOP 152.7 kts at 7.1gph

I tried 2000 rpm LOP and can't find the results. From memory, it was 143 kts at 5.4 gph which works out to 26 kts/gal or 30mile/gal.

GPS-PEC results for a -9A IO-320 Whirlwind C/S:

Point 4 Vwind Wind dir Vtrue 12/9/2018
Vg Track (kts) (deg) (kts) 100 ROP
150 1 15.6 355 165.5 2500 RPM 22.4 MP
163 272 16.5 360 164.5 8000 PA
181 180 15.5 4 165.5 9.4 GPH
164 91 14.2 359 164.2 Pmag A
ave 15.5 269.7 164.9
std dev 0.7

Point 5 Vwind Wind dir Vtrue 12/24/2018
Vg Track (kts) (deg) (kts) 10 LOP
151 4 7.7 283 152.4 2400 RPM 22.4 MP
160 92 7.1 279 153.0 8000 PA
154 180 6.6 285 152.4 7.1 GPH
146 273 7.3 289 153.0 Pmag A
ave 7.2 284.2 152.7 19.2 GALS Remaiing
std dev 0.3
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RV-9A N946PM 600+ hours since 2013
Nevada/Arizona
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  #5  
Old 12-29-2018, 05:29 PM
PilotjohnS PilotjohnS is offline
 
Join Date: Jan 2016
Location: Los Angeles
Posts: 588
Default

Quote:
Originally Posted by JohnInReno View Post
I tried 2000 rpm LOP and can't find the results. From memory, it was 143 kts at 5.4 gph which works out to 26 kts/gal or 30mile/gal.
3
I hope i get close to tbis with a catto foxed pitch!
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John S

WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.

Dues paid 2019, worth every penny

RV9A- Status: tail feathers done less tips
Wings done less tips and avionics
Fuselage 30%
www.pilotjohnsrv9.blogspot.com
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  #6  
Old 12-29-2018, 09:00 PM
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airguy airguy is offline
 
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Location: Garden City, Tx
Posts: 4,410
Default

John's numbers agree pretty close with mine - at 15k density altitude I'm regularly running 24 nm/gal at 140 ktas. At 18 and 21k Density altitude I'm seeing 25-26 nm/gal at 135-140 knots TAS. This is econ cruise WOTLOP 2300, and I definitely DO NOT have ideal drag cleanup on my fairings and cowling yet. I think I've easily got another single nm/gal in drag cleanup if not more.

I should add that I'm doing this on 91E10 fuel, not 100LL.
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Greg Niehues - PPSEL, IFR, Repairman Cert.
Garden City, TX VAF 2019 dues paid
N16GN flying 360hrs and counting! Built an off-plan 9A with too much fuel and too much HP. Should drop dead any minute now.
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  #7  
Old 12-30-2018, 08:29 PM
SpeedyMedina SpeedyMedina is offline
 
Join Date: May 2017
Location: Puerto Rico/ Orlando FL
Posts: 12
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Hi guys any one know if some one put an 118hp in the RV-9A? Im looking for real numbers in performance with that horse power and a fix pith propeller.
thank you for your time
Eddy
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  #8  
Old 12-30-2018, 09:03 PM
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9GT 9GT is offline
 
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Location: Southern Michigan
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Quote:
Originally Posted by SpeedyMedina View Post
Hi guys any one know if some one put an 118hp in the RV-9A? Im looking for real numbers in performance with that horse power and a fix pith propeller.
thank you for your time
Eddy
Vans prototype RV-9 was powered by a 118 hp Lycoming O-235 engine. Build your plane per plans and light and you will hit those numbers Van's lists on their website. Van's aircraft is known for not inflating their performance numbers. They are realistic numbers that can be easily met. https://www.vansaircraft.com/public/rv9perf.htm
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David C.
Howell, MI

RV-9A: Under Construction. N161RV (Reserved)
RV-10: N959RV Completed 12/29/2013 SOLD 08/23/2016

"Donor Exempt" but donated through Dec. 2019
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  #9  
Old 12-30-2018, 09:29 PM
SpeedyMedina SpeedyMedina is offline
 
Join Date: May 2017
Location: Puerto Rico/ Orlando FL
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Default

Quote:
Originally Posted by 9GT View Post
Vans prototype RV-9 was powered by a 118 hp Lycoming O-235 engine. Build your plane per plans and light and you will hit those numbers Van's lists on their website. Van's aircraft is known for not inflating their performance numbers. They are realistic numbers that can be easily met. https://www.vansaircraft.com/public/rv9perf.htm
Thanks for the quick response!! yes I see that one from Vans, but I was looking to some one that did it to see his opinion.! I see you use to have an RV-10, do you mind to tell me your opinion about that plane?
Thanks you again!
Eddy
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  #10  
Old 12-30-2018, 10:57 PM
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N941WR N941WR is online now
 
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Location: SC
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Quote:
Originally Posted by SpeedyMedina View Post
Hi guys any one know if some one put an 118hp in the RV-9A? Im looking for real numbers in performance with that horse power and a fix pith propeller.
thank you for your time
Eddy
I know a guy who put a 108 HP O-235 in his -9A and my -9 taildragger started life with a 135 ho O-290D2. I also have a friend who should be flying his 115hp -9A by the end of the summer.

They meet or exceed Van's numbers. Honestly, the only reason to build one with the small engine is if you have one laying around or get an amazing deal on one. The small engines just kill the resale value.
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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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