rvfltd(at)televar.com
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 Posted: Mon Feb 12, 2007 10:50 pm Post subject: Copper Tubing For Replacement Air Line??? Call Doug!!! |
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Outstanding post Walter! You get two attaboys for that one.
Always yakin,
Doug
Walter Lannon wrote:
[quote]
My 2 cents worth on the tubing question;
While copper was in fairly common use on aircraft in years gone by it
is not the best choice. As already pointed out it hardens over time
and becomes critical under vibration.
The correct material is 5052 aircraft tubing available from any
aircraft parts supplier.
The Chinese and Russian tubing is the same material and , in the 6 & 8
mm dia. has a wall thickness of 1 mm (0.0394")
The 8mm dia. can be directly replaced with 5/16" 5052 using the metric
nut and sleeve with no modification. Outer dia. is 0.0015" less. The
standard wall thickness of 0.035" may be adequate but I use (and
recommend) 0.049" to guarantee equivalent or better strength.
The 6mm dia. can be replaced by 1/4" 5052 and the 0.035" wall
thickness is adequate in this dia.
To use the metric fittings the sleeve is replaced by the standard AN
unit ( I forget the P/N) and the nut is modified by boring out to
accept the AN sleeve. This is easily done with an appropriate single
flute step drill, just be sure to make a small chamfer on the inside
edge to avoid damage to the sleeve.
A standard (Aircraft NOT Automotive) flaring tool is fine giving an
included angle of 75deg compared to the Russian/Chinese standard of
74deg.
Do not use the alum. alloy tubing available in coils. This is 3003
material and the strength is not adequate. It's aircraft use is (or
should be) limited to vent and static lines only.
Cheers;
Walt
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