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 snt0-omc3-s52.snt0.hotmail.com ([65.54.51.89] verified) by logan.com (CommuniGate Pro SMTP 5.4c2a) with ESMTP id 4827924 for lml@lancaironline.net; Thu, 27 Jan 2011 01:22:20 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.51.89; envelope-from=johnhadlich@live.com Received: from SNT134-W11 ([65.55.90.135]) by snt0-omc3-s52.snt0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Wed, 26 Jan 2011 22:21:45 -0800 X-Original-Message-ID: X-Original-Return-Path: johnhadlich@live.com Content-Type: multipart/alternative; boundary="_7926eb3a-4c6f-4357-bc12-b722d4d62ea4_" X-Originating-IP: [66.220.127.27] From: john Hadlich X-Original-To: Lancair Mail List Subject: RE: [LML] Engine mount cracks X-Original-Date: Wed, 26 Jan 2011 23:21:45 -0700 Importance: Normal In-Reply-To: References: MIME-Version: 1.0 X-OriginalArrivalTime: 27 Jan 2011 06:21:45.0041 (UTC) FILETIME=[786A2410:01CBBDEA] --_7926eb3a-4c6f-4357-bc12-b722d4d62ea4_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Michael=2C =20 I suggest sending it to snowline manufacturing in Bend Oregon=2C ask for Ar= t. They are most likely the company that originally manufactured the mount= . They'd be able to fix the mount properly. They may even have an update fo= r your mount i.e. gussets to prevent such an event. We had a mount recently= that was die tested and repaired with remarkable skill and precision. =20 John Fred Hadlich =20 Snowline Manufacturing Phone: (541) 617-1107 =20 Composite Assist LLC. 27 SE Bridgeford Blvd #A1 Bend or=2C 97702 =20 Email: Johnhadlich@live.com =20 To: lml@lancaironline.net Date: Wed=2C 26 Jan 2011 20:23:05 -0500 From: cberland@systems3.net Subject: [LML] Engine mount cracks Michael=2C =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=2C 4330 and 4340 are susceptible to cracking a= fter 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 se= ries 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 w= hat kind of steel it is. Additionally=2C the quality of weld on your engin= e mount is not very good. I would suggest replacing the mount unless you c= an confirm what material the mount was made from. If you choose to repair = the mount=2C Lancair should have specified the material and the fab house s= hould have material certs from the original build. Whether or not that inf= ormation 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 =20 <> = --_7926eb3a-4c6f-4357-bc12-b722d4d62ea4_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Michael=2C
 =3B
I suggest sending it to snowline manufacturing in Bend =3BOregon=2C ask= for Art. =3B =3BThey are most likely the company that originally m= anufactured the mount. They'd be able to fix the mount =3Bproperly. The= y may even have an update for your mount =3Bi.e. gussets to prevent suc= h an event. We had a mount recently that was die =3Btested and repaired= with remarkable skill and precision.
 =3B
John Fred =3BHadlich
 =3B
Snowline Manufacturing
Phone: (541) 617-1107
 =3B
Composite Assist LLC.
27 SE Bridgeford Blvd #A1
Bend =3Bor=2C 97702
 =3B
Email: Johnhadlich@live.com

 =3B
To: lml@lancaironline.net
Date: Wed=2C 26 Jan 2011 20:23:05 -0500
Fro= m: cberland@systems3.net
Subject: [LML] Engine mount cracks

Michael=2C

 =3B

I make a living maki= ng aerospace parts=85.Boeing is my largest customer=85.so I think my advice= is sound.

4000 series steels l= ike 4130=2C 4330 and 4340 are susceptible to cracking after weld if they ar= e not preheated and post heated during the weld process. =3B I do not k= now what material your engine mount is made of but the 4000 series steels (= chrome moly) are quite popular for this kind of application. =3B I woul= d be very leery of welding or re-welding steel tube and not knowing what ki= nd of steel it is. =3B Additionally=2C the quality of weld on your engi= ne mount is not very good. =3B I would suggest replacing the mount unle= ss you can confirm what material the mount was made from. =3B If you ch= oose to repair the mount=2C Lancair should have specified the material and = the fab house should have material certs from the original build. =3B W= hether or not that information is still available=85.I don=92t know. = =3B Finding a good welder at an airport may be challenging.  =3BAnother= thought=85losing the nose gear due to mount failure would be very expensiv= e.

 =3B

Craig Berland=

IV-P N7VG

 =3B

 =3B

<=3B<=3BThe two at= tached images show a crack in the engine mount on my Lancair IV-P. #4637 sh= ows context and #4641 details. The opposite side cracked in a similar fashi= on two years ago. (I have not had nose wheel shimmy.)


I would like advice on appropriate repair. My mechanic is suggest= ing some form of gusset which could improve the overall strength and preven= t a future occurrence.

I wonder if this might not be asking for trou= ble. Without doing some serious engineering you could create point loads th= at might be worse.

 =3B

Rather than remove the mount I would like to fly the plane to a highl= y skilled welder to make this repair. Any references for someone in the Nor= theast.

Other comments anyone?

Michael Newman>= =3B>=3B

 =3B

= --_7926eb3a-4c6f-4357-bc12-b722d4d62ea4_--