X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 27 Jan 2011 09:00:42 -0500 Message-ID: X-Original-Return-Path: Received: from elasmtp-banded.atl.sa.earthlink.net ([209.86.89.70] verified) by logan.com (CommuniGate Pro SMTP 5.4c2a) with ESMTP id 4828080 for lml@lancaironline.net; Thu, 27 Jan 2011 07:24:33 -0500 Received-SPF: none receiver=logan.com; client-ip=209.86.89.70; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=bee6UiGyaTSVVcJ4rUIwegsSwunOPOZmS2tuhMutv28U/CdH0fVZuqP3FVTm8XW3; h=Received:From:Mime-Version:Content-Type:Subject:Date:In-Reply-To:To:References:Message-Id:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [69.38.11.194] (helo=[10.0.0.77]) by elasmtp-banded.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1PiQtA-00068R-RO for lml@lancaironline.net; Thu, 27 Jan 2011 07:23:49 -0500 From: Colyn Case Mime-Version: 1.0 (Apple Message framework v1082) Content-Type: multipart/alternative; boundary=Apple-Mail-357--3777388 Subject: Re: [LML] Engine mount cracks X-Original-Date: Thu, 27 Jan 2011 07:23:22 -0500 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: X-Mailer: Apple Mail (2.1082) X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da94056097579b4e4928a249b0b57a32bf596350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 69.38.11.194 --Apple-Mail-357--3777388 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 Craig, It sounds as if the quality of the new mounts is questionable? How = would you go about getting a really solid mount built? Colyn On Jan 26, 2011, at 8:23 PM, Craig Berland. wrote: > Michael, > =20 > I make a living making aerospace parts=85.Boeing is my largest = customer=85.so I think my advice is sound. > 4000 series steels like 4130, 4330 and 4340 are susceptible to = cracking after weld if they are not preheated and post heated during the = weld process. I do not know what material your engine mount is made of = but the 4000 series steels (chrome moly) are quite popular for this kind = of application. I would be very leery of welding or re-welding steel = tube and not knowing what kind of steel it is. Additionally, the = quality of weld on your engine mount is not very good. I would suggest = replacing the mount unless you can confirm what material the mount was = made from. If you choose to repair the mount, Lancair should have = specified the material and the fab house should have material certs from = the original build. Whether or not that information is still = available=85.I don=92t know. Finding a good welder at an airport may be = challenging. Another thought=85losing the nose gear due to mount = failure would be very expensive. > =20 > Craig Berland > IV-P N7VG > =20 --Apple-Mail-357--3777388 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252 Craig,

It sounds as if the = quality of the new mounts is questionable? How would you go about = getting a really solid mount = built?

Colyn

On Jan 26, = 2011, at 8:23 PM, Craig Berland. wrote:

Michael,

I make a living making = aerospace parts=85.Boeing is my largest customer=85.so I think my advice = is sound.
4000 series steels like 4130, 4330 and 4340 are susceptible = to cracking after weld if they are not preheated and post heated during = the weld process. I do not know what material your engine mount is = made of but the 4000 series steels (chrome moly) are quite popular for = this kind of application. I would be very leery of welding or = re-welding steel tube and not knowing what kind of steel it is. = Additionally, the quality of weld on your engine mount is not very = good. I would suggest replacing the mount unless you can confirm = what material the mount was made from. If you choose to repair the = mount, Lancair should have specified the material and the fab house = should have material certs from the original build. Whether or not = that information is still available=85.I don=92t know. Finding a = good welder at an airport may be challenging. Another = thought=85losing the nose gear due to mount failure would be very = expensive.

Craig Berland
IV-P N7VG