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DOUBLE FLARING

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mmul6471(at)bigpond.net.a
Guest

Posted: Fri Jun 09, 2006 7:54 pm Post subject: DOUBLE FLARING

Greetings Listers, I have been told that the safest way to treat flares 

brake and fuel fittings  is with a double flaring tool. I can get my hands 

on a double flaring tool, but it is a 45degree fitting not 37 degree. I was 

thinking that I could use the double flaring tool to make the initial folded 

over flare, then my single 37degree flaring tool to finish it off. Does 

anyone see a problem with this approach??

Thanks, Mick

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khorton01(at)rogers.com
Guest

Posted: Sat Jun 10, 2006 4:29 am Post subject: DOUBLE FLARING

On 9 Jun 2006, at 23:53, Mick Muller wrote:



 	  Quote: 	
		   



 Greetings Listers, I have been told that the safest way to treat  

 flares brake and fuel fittings  is with a double flaring tool. I  

 can get my hands on a double flaring tool, but it is a 45degree  

 fitting not 37 degree. I was thinking that I could use the double  

 flaring tool to make the initial folded over flare, then my single  

 37degree flaring tool to finish it off. Does anyone see a problem  

 with this approach??


	


The only problem is that there is no service history for this  

technique, so there is no way to know how likely a failure is.  It  

might be acceptable, or they might have a high failure rate.



I wouldn't use this technique on any flare where the failure could  

cause a safety problem.  Fuel and brake lines are not a great place  

to be using an unproven technique.



Yes, double flares are probably a bit more reliable than single  

flares.  But, there are many thousands of aircraft flying with single  

flared tubes, and they aren't falling out of the sky because of  

them.  Either buy the right double flaring tool, or stick with single  

flares.



Kevin Horton         RV-8 (finishing kit)

Ottawa, Canada

http://www.kilohotel.com/rv8

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jcimino(at)echoes.net
Guest

Posted: Sat Jun 10, 2006 7:56 am Post subject: DOUBLE FLARING

I don't think aluminum line will take well to double fares.  You would also 

have to remove it from your tool  and put it in the 37 degree tool which 

would not work well.  Single fares are the standard for aviation and works 

well, I don't think there is any need to go to double fares. The pressures 

we are running are just not that high.

Jim



Jim Cimino

N7TL

RV-8  S/N 80039

150+ Hours

http://www.geocities.com/jcimino.geo/

---

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pitts_pilot(at)bellsouth.
Guest

Posted: Sat Jun 10, 2006 8:11 am Post subject: DOUBLE FLARING

I myself don't see too much of a problem with that scenario.  However, I 

don't think a double flare is a standard aviation activity.  I'm not 

sure if a double flare is 'safer' than a single flare anyway.  A double 

flare just adds 'meat' to the flare, allowing the compression to take 

care of any differences between the tube and the fittings.  However, 

having said that, those brake lines with double flares are STEEL, not 

aluminum, and doing all that stretching necessary for a double flare in 

aluminum tubing may make the tubing more susceptible to cracking, and 

furthermore the cracking may be inside the folded part where you can't 

see it.



I commented on the thread about sealants, and I had a brain fart ...... 

I was thinking of metal brake lines, and there may be nylon brake lines 

in the leaking assembly.  But then they'd be compression fittings with 

the nylon tube, not flare.  So, I'm confused. ..... I don't like the 

nylon tubeing as brake lines, but that's just my personal feelings. 

 However, I do see a lot of homebuilts with the nylon tubeing with 

leaking problems.  Most problems are due to leaving out the internal 

ferrule ..... the part that looks like a rivet with a hole through it. 

 The internal ferrule is there to give the outside compression ferrule 

something to squeeze the tubeing between.

Linn Walters

do not archive



Mick Muller wrote:



 	  Quote: 	
		   



 Greetings Listers, I have been told that the safest way to treat 

 flares brake and fuel fittings  is with a double flaring tool. I can 

 get my hands on a double flaring tool, but it is a 45degree fitting 

 not 37 degree. I was thinking that I could use the double flaring tool 

 to make the initial folded over flare, then my single 37degree flaring 

 tool to finish it off. Does anyone see a problem with this approach??

 Thanks, Mick



 http://www.matronics.com/Navigator?RV-List

 http://wiki.matronics.com

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chaztuna(at)adelphia.net
Guest

Posted: Mon Jun 12, 2006 5:11 am Post subject: DOUBLE FLARING

Mick,

  I had considered doing EXACTLY what you propose. However, I found 

that the vise block on the automotive double flaring tool had 

serrations designed to prevent slippage of the steel automotive 

tubing. These serrations imprinted themselves onto the soft aluminum 

tubing. These creates stress risers, which I found unacceptable. I 

created a "favorite search" for the correct tool on EBay. After 

several months, I was able to purchase the tool for $137.

  Check with your A&P friends or your local EAA Chapter. They may be 

willing to loan or rent you the tool.

Charlie Kuss

 	  Quote: 	
		  



Greetings Listers, I have been told that the safest way to treat 

flares brake and fuel fittings  is with a double flaring tool. I can 

get my hands on a double flaring tool, but it is a 45degree fitting 

not 37 degree. I was thinking that I could use the double flaring 

tool to make the initial folded over flare, then my single 37degree 

flaring tool to finish it off. Does anyone see a problem with this approach??

Thanks, Mick

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