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  #1  
Old 07-16-2022, 09:11 AM
AntoniouGA AntoniouGA is offline
 
Join Date: May 2022
Location: North Pole
Posts: 12
Default RV-6A Fuel Burn

I recently purchased an RV-6A and am picking it up next week. I had some questions regarding fuel planning I was hoping to get some insight on. I plan on being fairly conservative until I obtain truth data based on operating the plane. Here are my questions:

1. The plane has an O-360-A1F6 installed out of a C-177. Is it a safe assumption that the engine performance data in the C-177 POH (specifically percent power and fuel burn based on RPM/Manifold pressure) is accurate for the RV?

2. Is fuel burn always the same fora given percent power?

George
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  #2  
Old 07-16-2022, 10:07 AM
blaplante blaplante is offline
 
Join Date: Jan 2010
Location: Southern California
Posts: 515
Default

That's a good starting point.
The bible is actually the Lycoming operators manual.

https://www.google.com/search?client...UTF-8&oe=UTF-8
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RV6A in phase 2 as of April 2016
Donation made Dec 2022
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  #3  
Old 07-16-2022, 07:43 PM
abwaldal@gmail.com abwaldal@gmail.com is offline
 
Join Date: Jan 2017
Location: Battle Ground WA
Posts: 606
Default

RV-6A 575 hours
Flight yesterday at mostly 9,500 and 8,500 CS prop parallel valve I0-360 8.5-1 comp (was an 0-360) by SDS fuel and electronic ignition. Burning Costco premium. 3.1 hours= 8.06 gallons per hour.
Today 6,500 and 7,500 same type of flight, 3 hours 8.76 gallons per hour. Go figure?!! Same batch of fuel. I have 110 gallon tank in my work van. OOHHH maybe it's cause I changed the oil. Ha Ha!
This is running 2200 RPM and wide open throttle and leaned to peak.
When I'm lower I still run 2200 at 26" MFP.
Full Dynon HDX panel with auto pilot set for cruise.
WooHoo! Your luck may vary Art
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  #4  
Old 07-16-2022, 08:18 PM
RVDan RVDan is offline
 
Join Date: Jun 2012
Location: Frederick, MD
Posts: 990
Default

I have flown an RV6A equipped with a O-360-A1A which is same compression ratio and horsepower and constant speed prop. At 5000 ft 2300 rpm, WOT, I would flight plan 8 gph leaned, with a resulting TAS of 155 Kts. These are good targets for planning purposes.
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Dan Morris
Frederick, MD
PA28-140 sold
Hph 304CZ sold
RV6 built and sold
N199EC RV6A flying
Retired Aerospace Engineer and A&P/IA
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  #5  
Old 07-16-2022, 09:37 PM
Taltruda Taltruda is offline
 
Join Date: Oct 2017
Location: Las Vegas, NV
Posts: 1,391
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Depending on manifold pressure, rpm and leaning, you’ll probably find 8.5/hour pretty close. Start your planning at 10/hr to be ultra conservative, then learn what your plane actually delivers.
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Las Vegas
RV-4 flying…
RV-8 empenage finished 10-2020

Wings Started.. 11-2020
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  #6  
Old 07-16-2022, 10:49 PM
Latech15 Latech15 is offline
 
Join Date: Apr 2018
Location: louisiana
Posts: 217
Default

I consistently get 7.2-7.3 with a o-360 and a fixed pitch prop at 2400.
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  #7  
Old 07-18-2022, 10:02 AM
664781 664781 is offline
 
Join Date: Jan 2005
Location: Powder Springs, Ga
Posts: 361
Default fuel Consumption

RV6A o-360-A1A WOT at 5K is always 10 GPH.
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Kurt Lohmueller A&P, DAR
Powder Springs, Ga
RV6A "Kurt's Toy" - Flying
RV12 - Flying - Sold
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  #8  
Old 07-18-2022, 10:15 AM
Taltruda Taltruda is offline
 
Join Date: Oct 2017
Location: Las Vegas, NV
Posts: 1,391
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Quote:
Originally Posted by 664781 View Post
RV6A o-360-A1A WOT at 5K is always 10 GPH.
Haha! I bet!! Surprised it’s not closer to 12gph!! Sounds like you like to fly fast, but I found if you pull the throttle back just a little bit, just so it starts to move the manifold pressure needle without really reducing power, then lean it a hair, it closes the enrichment “valve” and you get better fuel burn without losing any speed.
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Las Vegas
RV-4 flying…
RV-8 empenage finished 10-2020

Wings Started.. 11-2020
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  #9  
Old 07-19-2022, 02:24 PM
664781 664781 is offline
 
Join Date: Jan 2005
Location: Powder Springs, Ga
Posts: 361
Default Carb

Quote:
Originally Posted by Taltruda View Post
Haha! I bet!! Surprised it’s not closer to 12gph!! Sounds like you like to fly fast, but I found if you pull the throttle back just a little bit, just so it starts to move the manifold pressure needle without really reducing power, then lean it a hair, it closes the enrichment “valve” and you get better fuel burn without losing any speed.
Tom,
My carb had the 2 piece venturi and now a single. It will stumble if I pull it back unless I run real rich. Tried the carb heat trick also but no joy. Its either 2450 or WOT. It runs much better at WOT and I can lean it more aggressively.
Wife wanted me to keep the RV12 but it was just too slow....LOL
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Kurt Lohmueller A&P, DAR
Powder Springs, Ga
RV6A "Kurt's Toy" - Flying
RV12 - Flying - Sold
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  #10  
Old 07-20-2022, 07:07 AM
WingsOnWheels WingsOnWheels is offline
 
Join Date: Mar 2009
Location: Plano, TX
Posts: 2,364
Default

Here is what I get with my cruise-pitched Catto O-360 RV6A

Speeds are Knots TAS at 8500ft DA

RPM / KTAS / GPH

2400 / 146 / 8.3
2500 / 153 / 9.0
2600 / 160 / 9.7
2680 / 166 / 10.9 (WOT)
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RV-6A #20603
Complete 5/10/19
PP SEL / A&P
I donate every year on my B-Day (in Dec)
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