X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.101] (HELO ms-smtp-02-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTP id 1020629 for flyrotary@lancaironline.net; Fri, 24 Jun 2005 15:48:20 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.101; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-065-188-083-049.carolina.res.rr.com [65.188.83.49]) by ms-smtp-02-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j5OJlVl9002900 for ; Fri, 24 Jun 2005 15:47:32 -0400 (EDT) Message-ID: <001201c578f5$90976a10$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Brake Line Incident Photos Date: Fri, 24 Jun 2005 15:47:33 -0400 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Virus-Scanned: Symantec AntiVirus Scan Engine No Marc, The plans call for aluminum tubing all the way to the caliper fitting. The design does call for a "Loop" around the landing gear rod to provide for the aluminum line to flex as the caliper moves in and out - mine had this loop. However, giving the poor fatigue characteristics of Aluminum, I think a flexible line is the only way to go. Stainless steel braided line has my vote. However to be fair, Van has hundreds if not thousands of RVs flying with this set up. Bill, mentioned an RV-8 transiting Thailand having a similar brake fire recently and I have heard of others - but not many. Its "too many" when it happens to you {:>) Its a pretty helpless feeling to exit the side of the runway and only be along for the ride {:>). My first schedule refueling stop was at Gunntersville, Al which has its runway running out into a lake - sure glad I never got that far as you can imagine. Ed ----- Original Message ----- From: To: "Rotary motors in aircraft" Sent: Friday, June 24, 2005 3:33 PM Subject: [FlyRotary] Re: Brake Line Incident Photos > Ed, > Almost all certified installations have a flexible line section at the > wheel to connect from the leg al tubing to the wheel brake puck assy. Did > you have that? > Marc Wiese >> >> From: "Ed Anderson" >> Date: 2005/06/24 Fri AM 10:21:43 EDT >> To: "Rotary motors in aircraft" >> Subject: [FlyRotary] Re: Brake Line Incident Photos >> >> Yes, John - luck and a quick acting nephew {:>). The only answer I can >> come up with is that the aluminum line suffered a fatigue fracture which >> weakened the tube and the hydraulic pressure finally blew out the chunk. >> The line has a loop to provide flexing as the caliper moves in and out - >> but, flexing aluminum is not know for a long life. In all fairness, >> there are many RVs flying with this configuration - so the break might be >> attributed to my installation (stressing the line when I put the loop in >> it), material weakness, some damage I did not notice, etc. Had over 300 >> landings before the failure. >> >> Ed >> ----- Original Message ----- >> From: John Slade >> To: Rotary motors in aircraft >> Sent: Friday, June 24, 2005 9:09 AM >> Subject: [FlyRotary] Re: Brake Line Incident Photos >> >> >> Wow, Ed! >> You're luck the airplane wasn't consumed. >> My question - how did that big chunk get blown out of the brake line? >> Regards, >> John >> -----Original Message----- >> From: Rotary motors in aircraft >> [mailto:flyrotary@lancaironline.net]On Behalf Of Ed Anderson >> Sent: Friday, June 24, 2005 8:58 AM >> To: Rotary motors in aircraft >> 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 {:>) >> >> >> Ed >> >> Ed Anderson >> Rv-6A N494BW Rotary Powered >> Matthews, NC >> eanderson@carolina.rr.com >> > >>> Homepage: http://www.flyrotary.com/ >>> Archive: http://lancaironline.net/lists/flyrotary/List.html