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08-14-2020, 06:58 AM
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Join Date: May 2015
Location: Liberty Township OH
Posts: 99
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KHAO to KUKT 427nm. Non stop?
For the peanut gallery,
I’m planning this flight for the coming week. Would you take this trip non stop? Recognizing that at least one direction I’ll have a headwind...
If you would, what RPM would you target? I’m pretty sure 5000rpm at 7500 makes it relatively comfortable from a fuel burn perspective but it’s obviously a bit slower and the engine doesn’t seem as happy at that rpm vs 5200+.
There are plenty of good airports I would directly over fly if fuel becomes an issue. But zero 91 octane mogas except when I’m basically there (Hershey PA).
One figure I haven’t sorted yet is fuel burn during climb out. Should I estimate 6gph?
Anyway, curious on longest legs and rpm settings folks use on long x country (for ar v12)
Thanks!
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08-14-2020, 07:31 AM
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Join Date: Jun 2010
Location: Sunman, IN
Posts: 2,189
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Three things...
1.
Remember that it is about time in the air for fuel planning; not distance. If you have 4 hours of fuel on board, at the end of four hours you WILL be landing, regardless of the distance covered.
2.
There is NO EXCUSE for running out of gas in an airplane.
3.
HAVE FUN!
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Bob
Aerospace Engineer '88
RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
EFII System 32 - Done
297 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...
Dues+ Paid 2019,...Thanks DR+
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08-14-2020, 09:02 AM
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Join Date: May 2015
Location: Liberty Township OH
Posts: 99
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Great advice and could not agree more. I’ll probably just set throttle at 5200 and around 3hrs evaluate when if I need to land based on distance from kukt
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08-14-2020, 09:22 AM
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Join Date: Oct 2009
Location: Utah
Posts: 81
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We all have our own personal standards, some are more aggressive than others.
I plan a VFR minimum reserve of 1 hour. In the -12, a minimum 30 min VFR fuel reserve is just over a couple of gallons. I can't imagine myself flying with that little amount of fuel, even with the low fuel burn of the Rotax. I can't trust the fuel totalizer to be precise enough to handle those small numbers.
It's also a good practice to plan your fuel stop mid-trip so you aren't tempted to push on when you are getting close to your final destination.
You may consider starting more conservatively, and then building confidence in your fuel burn based on the amount of fuel you actually add from the pump. Different carb settings, etc. can make one -12 have slightly different consumption rates than another. I run leaner carb jets due to being based at 4300 ft MSL, which results in a different fuel burn.
Personally, I wouldn't attempt a 427 nm flight in the -12. But that's just me.
Be safe out there!
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08-14-2020, 10:09 AM
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Join Date: May 2015
Location: Liberty Township OH
Posts: 99
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Yep, looking at a pit stop at somerset (2G9). That’s about 2hrs in. Which is what I’ll likely do. I am risk adverse despite the original question. One other thought:
Anyone ferry a 5 gallon gas container in baggage area and use that to top off along way? My biggest concern is the new style containers aren’t vented. Net, any concerns with pressure change at 7500ft? Just hate using 100LL if it can be avoided.
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08-14-2020, 10:30 AM
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Join Date: Dec 2018
Location: Granada Hills
Posts: 820
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Lowest burn rate is at 10,000 feet and 5000 rpm. About 101 Kts TAS and about 576 kts range, I believe, at 3.4 gals /hr.
Extrapolate between 5500 rpm and 5000 rpm, for your 5200 rpm burn rate, at 10,000 ft. I get 105 kts, 3.7 gal /hr, 28.5 NMpg, 5:23 for air time, and Range of 555 NM.
Remember that the higher you go, when you cruise, the less drag on the plane, so you need less thrust, too, and less fuel burn rate.
Maybe look at winds aloft too, to see which various elevation has most favorable winds for your trip.
Previous owner put a 6.5 gallons boat fuel tank as an Aux tank in my plane, before I bought it. Look up the mod in "things you've modified or done to your RV-12" thread, around 2012. Also a second RV-12 fuel pump and aux fuel pumps switch and all the plumbing. Turn the switch on and in 20 minutes, the 6.5 gallon tank gets pumped into the main. About 4.7 hours useful instead of 3.5 hours with a 1/2 hr reserve.
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N72DJ, RV-12, bought flying. A Blessing in disguise. Thank you Double D!
Last edited by NinerBikes : 08-17-2020 at 01:19 PM.
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08-14-2020, 10:32 AM
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Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,065
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Using tank of 100LL every so often is not a problem. Doesn't even have to be figured into oil change interval if exception and not common occurrence.
Better to take whiz and buy fuel than to not take whiz and not buy fuel...
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Jim Stricker
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 622 
LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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08-14-2020, 10:42 AM
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Join Date: Dec 2018
Location: Granada Hills
Posts: 820
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You can play around here flight planning and modify the variables to see how it pans out. Highest elevation and slower airspeeds increase range. Added speed increases fuel consumption exponentially, so slow down, if you need more range.
https://skyvector.com/
__________________
2020 Dues paid
N72DJ, RV-12, bought flying. A Blessing in disguise. Thank you Double D!
Last edited by NinerBikes : 08-14-2020 at 10:45 AM.
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08-14-2020, 10:44 AM
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Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,820
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It’s rare, but sometimes runways close for accidents. It has happened to me. There is a reason FARs require a 30 minute reserve for day VFR. I prefer at least an hour, and depending on the availability of alternates maybe more. Besides, it’s easier on the bladder,😜
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08-14-2020, 10:56 AM
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Join Date: May 2015
Location: Liberty Township OH
Posts: 99
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Somerset stop it is 
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