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07-12-2014, 06:50 PM
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Join Date: May 2014
Location: Fort Mill SC
Posts: 333
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What do you flight plan for cruise speed and fuel burn?
What do you folks use for cruise speed and fuel burn when planning a cross country in the RV-12?
I would really appreciate any and all experienced input, thanks!
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07-12-2014, 08:06 PM
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Join Date: Aug 2008
Location: Texas, Fort Worth
Posts: 1,237
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Cruising at 3000'msl 5450 RPM 5.5 gals an hour.  Lower RPM means lower gals per hour!
__________________
John
RV12 N1212K
Flying Since June 2010
1020 Hours as of 9/30/2017 
Johnrv12@icloud.com
RV14 Wing, arrived and building at Rdog's new Hanger at 16X
S/N 140014 
Last edited by Jetguy : 07-12-2014 at 08:23 PM.
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07-12-2014, 09:04 PM
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Join Date: May 2014
Location: Fort Mill SC
Posts: 333
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Quote:
Originally Posted by Jetguy
Cruising at 3000'msl 5450 RPM 5.5 gals an hour. Lower RPM means lower gals per hour! |
Thanks for the info!
So?one guy told me 5140 rpm (about 21MAP) produces 4.5 gph. That sound right? (for planning).
Thanks again. |
07-12-2014, 09:24 PM
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Join Date: Jan 2013
Location: Shingle Springs, CA
Posts: 57
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Fuel burn
Can't give you much on cruise speed since I just made by first flight about a week ago but I have 1000 hours on the same engine in my other airplane and that burn sounds right.
I cruise @5000 rpm and get consistent 4.2-4.3 gal/hr. @5200 rpm, 4.6 - 4.8 gal/hr. @5500 rpm, 5.5-5.6 gal/hr.
The RV-12 is faster but WOT on both are about the same.
Bill
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07-12-2014, 09:34 PM
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Join Date: May 2014
Location: Fort Mill SC
Posts: 333
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Thanks a lot Bill!  |
07-13-2014, 05:39 AM
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Join Date: Nov 2008
Location: Gloversville, NY
Posts: 1,587
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You will need to refine the numbers for your own airplane, and your cruising habits, because there are just two many variables to quote a "standard" number. For example:
Prop pitch, which affects RPM vs. MP ratio.
Desired cruise speed.
Cruising altitude.
The nice thing is, you can fly this engine/airplane combination at a wide range of power settings, depending on your mission that day. Going somewhere in a hurry? WOT at high altitude. Local sightseeing? Low power, low fuel burn, low speed.
__________________
John Peck, CFII, A&P, EAA Tech Counselor, Flight Advisor.
?Master Pilot? Award, UFO Member.
RV-12 N37JP 120176 Flying since 2012.
One Week Wonder Build Team, OSH 2018.
VAF paid through 10/2019.
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07-13-2014, 05:48 AM
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Join Date: Jan 2005
Location: Martinsville, IN
Posts: 2,326
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I plan at 114 kts and 5 gal/hr. Prop pitch affects these.
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Randy Pflanzer
Greenwood, IN
www.pflanzer-aviation.com
Paid through 2043!
Lund fishing Boat, 2017, GONE FISHING
RV-12 - Completed 2014, Sold
427 Shelby Cobra - Completed 2012, Sold
F1 EVO - partially completed, Sold
F1 Rocket - Completed 2005, Sold
RV-7A - Partially completed, Sold
RV-6 - Completed 2000, Sold
Long-EZ - Completed 1987, Sold
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07-13-2014, 08:07 AM
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Join Date: Sep 2006
Location: Defiance, MO
Posts: 1,666
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Quote:
Originally Posted by Top Cat
Thanks for the info!
So…one guy told me 5140 rpm (about 21MAP) produces 4.5 gph. That sound right? (for planning).
Thanks again.
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Look in the POH. Should be listed there after initial flight test determines the numbers for your aircraft.
__________________
Philip
RV-6A - 14+ years, 900+ hours
Based at 1H0 (Creve Coeur)
Paid dues yearly since 2007
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07-13-2014, 12:30 PM
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Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,818
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5100 RPM, 20-21" MAP, 110 KTAS, 4.5 GPH. Very consistent numbers for my plane.
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07-13-2014, 01:22 PM
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Join Date: May 2014
Location: Fort Mill SC
Posts: 333
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Quote:
Originally Posted by plehrke
Look in the POH. Should be listed there after initial flight test determines the numbers for your aircraft.
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I haven't picked my airplane from Vans yet so I don't have access to POH.
I appreciate the actual working numbers from experienced owners as I start planning flying trips. Thanks guys! |
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