37 Degree Single vs Double Flared Tubing

Do aluminum fuel lines need to be double flared (37 degree flaring)? A 37
degree double flaring tool is very expensive compare to the single flare
type. I ran across this in a Car Craft magazine article:

"Most tubing in the aircraft industry is extruded in one piece with no seam,
so double flares aren't required to prevent crack formation."

For a one-time use, I bought a cheapie $10 45 degree flaring tool, took the
taper off, and recut it in a lathe to 37 degrees. YMMV

-Cory

Craig Foster wrote:
: Do aluminum fuel lines need to be double flared (37 degree flaring)? A 37
: degree double flaring tool is very expensive compare to the single flare
: type. I ran across this in a Car Craft magazine article:

: "Most tubing in the aircraft industry is extruded in one piece with no seam,
: so double flares aren't required to prevent crack formation."



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* Cory Papenfuss *
* Electrical Engineering Ph.D. Graduate Student *
* Virginia Polytechnic Institute and State University *
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