Hear! Hear! Bill.
It had never even occured to be (before hand) that having
aluminum tube interfacing with a frequently moving (caliper) part is probably
not the best of all worlds. Not withstanding the fact there are
hundreds and thousands of Rvs flying with this set up - there has also been
several brake fire incidents including some with reportedly consumed the
aircraft. Aluminum of course fatigues from motion fairly easily.
Fatigued aluminum breaks, breaks in pressurized tubes lead to atomized
and easily ignited mixtures which when combined with a low flash point liquid
can easily lead to a FIRE!!
I can only conclude that when I was installing the
aluminum tube I may have worked hardened it getting it to bend around the axial
as called for to give it that flex coil, or the tube material could have been
defective or it could have been started by damage to the tube that I did not
detect. But as can be seen from the photo its clearly a fatigued break
with a section of tubing blown out.
So I eliminated the tubing for SS steel braided hose -Yes,
this hose couldleak but most likely will not give way suddenly and
leave me with no brakes. I eliminated the low flash point hydraulic fluid
with I feel contributed to the fire. I just don't want to get bit
twice by the same dog.
Ed A
----- Original Message -----
Sent: Tuesday, December 06, 2005 2:59
PM
Subject: [FlyRotary] Re: Brake Fire
Photo
The thing to take from Ed's brake
problem is to trust your judgment on some
things. There was no problem with his rotary engine here, rather a so
called, "Tried and true" standard part was what failed. I understand
why many people will follow plans to the letter and I don't argue with
that. The fact is that we often accept certified parts as gospel. My advise to
the group is that if something seems shaky, (like 200°F flash point brake
fluid), it is probably a holdover from early flying days. investigate if it
might be improved! I WILL NOT USE OLD STYLE BRAKE FLUID IN MY AIRCRAFT. I plan
to use a racing quality brake fluid. If it is necessary I'll change the seals.
Bill Jepson -----Original Message----- From: Bob
Perkinson < bobperk@bellsouth.net> To: Rotary motors in aircraft
< flyrotary@lancaironline.net> Sent: Tue, 6 Dec 2005 12:10:23
-0600 Subject: [ FlyRotary] Re: Brake
Fire Photo
Boy Ed, all the excitement
you have had kind of makes me wonder why I am building and experimental
airplane}:>) I am not sure I can handle that much excitement, but I
guess I will try. My-9 fuselage is in Chicago today, sand should be
in Nashville Friday,
Bob Perkinson Hendersonville, TN. RV9
N658RP Reserved If nothing
changes Nothing changes
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