Mailing List flyrotary@lancaironline.net Message #28220
From: Ed Anderson <eanderson@carolina.rr.com>
Subject: Re: [FlyRotary] Re: Brake Fire Photo
Date: Tue, 6 Dec 2005 15:44:09 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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
 
Subscribe (FEED) Subscribe (DIGEST) Subscribe (INDEX) Unsubscribe Mail to Listmaster