swisseagle
Well Known Member
Flares according to SAEJ533!
Hello
In switzerland we lost the first RV-9 due to a bad flare, after about 40h.
The repport you can find here: http://www.bfu.admin.ch/common/pdf/u1987_d.pdf Page 9, 10, 11.
The problem is, when you make the flare to big, the material is thinned out and hardened. Thats where the Norm come handy to prevent that.
Interestingly, there is a Norm to manufacture these flarings, SAEJ533, even more interestignly is, that nearly nobody know that and inform about that, not Vans, not in the EAA video, not the supplyer of the tools!?
So how could a builder find the source and can do it propperly?
From a not officially source:
There is also a different torque for aluminum fittings (which you use with rubberhose thogether) and aluminum tubing!
You will crack the tubing (3003 only), even when you will use the correct torque, but allow the tubing to rotate with the nut, when you tighten it! It will squeeze the flaring even more and the material let go and getting thinner and harder.
There are other places where it is nearly the same, an example are the Fuel-Pump-Fittings with the O-Ring. Many, many threads are adressing that nobody know the torque to apply!?
I bought the 5XXX tubing vom Spruce and let them send to Vans, so they included it in my box, this way it was much cheaper than letting send the straight tubes to europe.
Regards, Dominik
Hello
In switzerland we lost the first RV-9 due to a bad flare, after about 40h.
The repport you can find here: http://www.bfu.admin.ch/common/pdf/u1987_d.pdf Page 9, 10, 11.
The problem is, when you make the flare to big, the material is thinned out and hardened. Thats where the Norm come handy to prevent that.
Interestingly, there is a Norm to manufacture these flarings, SAEJ533, even more interestignly is, that nearly nobody know that and inform about that, not Vans, not in the EAA video, not the supplyer of the tools!?
So how could a builder find the source and can do it propperly?
From a not officially source:
There is also a different torque for aluminum fittings (which you use with rubberhose thogether) and aluminum tubing!
You will crack the tubing (3003 only), even when you will use the correct torque, but allow the tubing to rotate with the nut, when you tighten it! It will squeeze the flaring even more and the material let go and getting thinner and harder.
There are other places where it is nearly the same, an example are the Fuel-Pump-Fittings with the O-Ring. Many, many threads are adressing that nobody know the torque to apply!?
I bought the 5XXX tubing vom Spruce and let them send to Vans, so they included it in my box, this way it was much cheaper than letting send the straight tubes to europe.
Regards, Dominik
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