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03-13-2015, 08:33 PM
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Join Date: Jan 2010
Location: Ottawa, Ks
Posts: 2,188
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Because it was easily accessible ($11 for 6 feet) it seems to have a larger tolerance to operator error I chose to start remaking my fuel lines with the 5052. That being said I have no fear of using the 3003 now that I think I know a little more about flaring.
The flares of the 5052 look smoother/better than the 3003.
My first redo was a nice fit, hopefully the rest will be just as easy.

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RV 7 400 hours and counting
19 donation done
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03-13-2015, 09:21 PM
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Join Date: Nov 2008
Location: Scio,Oregon
Posts: 261
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Andy, I see there is circular line on the inside of both your flares. I would polish up the cone on you flaring tool. There might be some aluminum transferred to the forming cone. Also on the outside of the flares the sharp corner in pretty severe. I would consider breaking that edge on the flailing tool.
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Steve S.
Rebuilding RV6A
Scio, OR
EAA Ch. 292
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03-14-2015, 06:19 AM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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Quote:
Originally Posted by Zero4Zulu
Andy, I see there is circular line on the inside of both your flares. I would polish up the cone on you flaring tool. There might be some aluminum transferred to the forming cone. Also on the outside of the flares the sharp corner in pretty severe. I would consider breaking that edge on the flailing tool.
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Now that we are to the final improvements in techniques, yes, I take my ends (took) and buffed on the fine scotcbrite wheel to eliminate tool marks. I even took some 1000 grit and polished the clamping die on my Rolo Flare (parker) .
I really don't know if it makes a big difference.
Andy, kudos for this whole process. It is clear that many others have the same flaring tool and could (or have) unwittingly done the same thing. There are just so many details to learning in a build. All of us refine techniques as we go.
The last pictures of flares look very very good. Thankfully, Vans designs are quite forgiving in many respects. It was not luck on Vans part.
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Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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03-14-2015, 06:40 AM
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Join Date: Jan 2010
Location: Ottawa, Ks
Posts: 2,188
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I think I will dress up the edges on my flaring tool, big Thanks again for the advice.
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RV 7 400 hours and counting
19 donation done
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03-14-2015, 09:00 AM
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Join Date: Jan 2007
Location: Battleground
Posts: 4,348
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Nice work. This is also a testimate to how reliable these fittings are, even when improperly done. They usually leak well before manifesting into a more serious issue.
Great catch and good thread.
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Smart People do Stupid things all the time. I know, I've seen me do'em.
RV6 - Builder/Flying
Bucker Jungmann
Fiat G.46 -(restoration in progress, if I have enough life left in me)
RV1 - Proud Pilot.
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03-14-2015, 09:07 AM
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Join Date: Oct 2007
Location: Salmon Arm, BC
Posts: 933
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Just to let you know you are not alone in redoing fuel lines. I had mine all done in 3003, was not particularly happy with them and subsequently redid them in 5052 before first flight. Second time around is much easier as the patterns are made.
The spec on torque/flats is here: http://www.vansaircraft.com/pdf/Torq...m_Fittings.pdf
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Mark Olson
1987 RV-4 Sold
2003 Super Decathlon - Sold
F1 EVO Rocket, first flight May 31/14
First in line for the Sonex JSX-2T kit
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03-14-2015, 09:48 AM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,652
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Looks mucho better!
...and I'm another who knows the pain of the fuel line replacement process on a completed airplane. I've run through a bunch of new 5052 behind the firewall, and an equal amount of stainless forward. My scrap box of 3003 and oil soaked firesleeved hose assemblies gets bigger all the time.
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
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Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
Last edited by Toobuilder : 03-16-2015 at 06:49 AM.
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03-14-2015, 11:11 AM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,947
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Torque values
Quote:
Originally Posted by SMO
Just to let you know you are not alone in redoing fuel lines. I had mine all done in 3003, was not particularly happy with them and subsequently redid them in 5052 before first flight. Second time around is much easier as the patterns are made.
The spec on torque/flats is here: http://www.vansaircraft.com/pdf/Torq...m_Fittings.pdf
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I am no expert so this is a serious question. I am not questioning the post or the link.
Why are the values in AC 43-13 Table 9 lower. The Vans doc mentions "high performace". Which values do we use?
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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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03-14-2015, 12:23 PM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,435
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What Thickness?
I should probably add some 5052 to my list... what wall thickness are y'all using?
Thanks,
Dave
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03-14-2015, 12:32 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by SMO
Just to let you know you are not alone in redoing fuel lines. I had mine all done in 3003, was not particularly happy with them and subsequently redid them in 5052 before first flight. Second time around is much easier as the patterns are made.
The spec on torque/flats is here: http://www.vansaircraft.com/pdf/Torq...m_Fittings.pdf
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Keep in mind that this chart is for hose end fittings.
The seating material in the fitting that produces the seal is much harder than the flared end of a line made from tubing (whether that be 3003 or 5052).
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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