Pretty much anything that moves best not
be connected with aluminum tubing. Fatigue life just isn’t there.
I used 3/16 SS braided Teflon line at
the caliper; and covered it with heat shrink tube to keep out the grit and dust
from the fitting up to where the line is covered by fiberglass. Note the
heat shrink is sealed over the end fitting. (Photo attached)
The stock Velocity kit comes with Nylaflow
lines for the brakes. I didn’t like that, so used solid aluminum
from cylinder to gear bulkhead, and the braided line from there (It’s a
retract, so line has to flex). On he other hand, there are lots of EZ’z
and other Velocitys that have flown for many years with the Nylaflow and no
problems. My guys change it out on about a 5 year cycle, but I know of an
EZ that has flown for 15 years with the Nylaflow.
Al
-----Original Message-----
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Ed Anderson
Sent: Friday, June 24, 2005 6:18
AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Brake
Line Incident Photos
David, it was aluminum tubing which
is what's called for on the RV-6A brake system. However, in hindsight
- thinking about the low fatigue life of flexing aluminum, I think there
are better choices.
----- Original Message -----
Sent: Friday,
June 24, 2005 9:04 AM
Subject: [FlyRotary]
Re: Brake Line Incident Photos
Ed, what kind of brake line was
that?
----- Original Message -----
Sent: Friday,
June 24, 2005 7:58 AM
Subject: [FlyRotary]
Brake Line Incident Photos
For those interested (and may not
have seen them) , here are a few photos of my brake line fire incident.
Big chunk got blown out of
brake line as can be seen from Brakelines.jpg photo. Effect of resin
burning seen on wheel pant photos. Once the line broke, the next time I
depressed the brake pedal, a fireball from the wheel to over the wing resulted
from spraying the hydraulic fluid over the hot brake assembly. The flash
point of the fluid is only 240F! I am going to investigate some stuff
with a bit higher flash point {:>)