X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 30 Sep 2013 08:59:06 -0400 Message-ID: X-Original-Return-Path: Received: from omr-d03.mx.aol.com ([205.188.109.200] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTPS id 6495763 for lml@lancaironline.net; Mon, 30 Sep 2013 08:07:04 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.109.200; envelope-from=vtailjeff@aol.com Received: from mtaout-ma06.r1000.mx.aol.com (mtaout-ma06.r1000.mx.aol.com [172.29.41.6]) by omr-d03.mx.aol.com (Outbound Mail Relay) with ESMTP id 18B9470124837 for ; Mon, 30 Sep 2013 08:06:30 -0400 (EDT) Received: from [192.168.1.119] (24-107-98-233.dhcp.stls.mo.charter.com [24.107.98.233]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by mtaout-ma06.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPSA id AD812E000087; Mon, 30 Sep 2013 08:06:29 -0400 (EDT) References: In-Reply-To: Mime-Version: 1.0 (1.0) Content-Type: multipart/alternative; boundary=Apple-Mail-7C763CB9-5AE7-4350-AFE6-483C2320C630 X-Original-Message-Id: Content-Transfer-Encoding: 7bit X-Mailer: iPad Mail (9B206) From: vtailjeff@aol.com Subject: Re: [LML] Re: Engine Mount Crack X-Original-Date: Mon, 30 Sep 2013 07:06:31 -0500 X-Original-To: Lancair Mailing List x-aol-global-disposition: G x-aol-sid: 3039ac1d29065249694529de X-AOL-IP: 24.107.98.233 --Apple-Mail-7C763CB9-5AE7-4350-AFE6-483C2320C630 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Has anyone talked to Lancair or the build shops like Mark Mahnke about this?= Jeff Sent from my iPad On Sep 29, 2013, at 9:53 PM, John Smith wrote: > I too have this same issue with slight movement of the engine mount. No cr= acks evident =E2=80=93 fortunately. >=20 > Even after setting the gear down pressure as low as possible yet still all= ow the gear to extend properly, and having adjusted the actuator length so t= here is no actuator load on the assembly in the down and locked position. >=20 > So I checked for free movement etc of the strut, the links etc =E2=80=93 a= ll fine, no binding anywhere. Having disconnected the over-centre links from= the nose strut, I yanked the over centre links up and down =E2=80=93 what I= found was that the engine mount moved forwards and backwards a few millimet= res simply due to the leverage acting on the engine mount / over-centre link= from hydraulic cylinder (even with dump valve open). The mount really does= n't appear to be strong enough. My kit was a 2008 supply, and I believe the "= design" changed a few years before this=E2=80=A6=E2=80=A6 I understand earli= er mounts are somewhat more robust in this area. >=20 > I have 4.5MB video if anyone interested =E2=80=93 but send me an email dir= ectly and I'll forward as too large to post on the forum, I think. >=20 > After some discussion with a professional builder, I am now working on mak= ing up some carbon fillets (prob around 12 BID, and similar in concept to th= e upper engine mount fillets reinforce the upper engine mount bolts). The i= dea is to flox these in behind the firewall and up against the side of the n= ose gear tunnel. Care obviously needed to make sure they clear the strut / f= ork on retraction, but idea is to size / position these such that each can a= ccommodate an AN4 bolt that penetrates the firewall a fraction inboard of th= e engine mount plate and immediately adjacent the nose gear over-centre link= mounting point brackets and pulls up on clamp pieces machined to fit over /= inside the bracket. I'm hoping this will be sufficient to stop the mount m= oving forward, and also reinforce support behind the engine mount when ther= e aft loads on these nose gear brace points. >=20 > Appreciate any comments and others' experiences / solutions or alternative= ideas (other than removing engine, removing engine mount, and reinforcing t= he engine mount and putting it all back together again=E2=80=A6!) >=20 >=20 >=20 > Regards, >=20 > John >=20 > VH-XTZ Kit #323 >=20 >=20 >=20 > John N G Smith > Tel / fax: +61-8-9385-8891 > Mobile: +61-409-372-975 > Email: john@jjts.net.au >=20 --Apple-Mail-7C763CB9-5AE7-4350-AFE6-483C2320C630 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8
Has anyone talked to Lanca= ir or the build shops like Mark Mahnke about this?

= Jeff

Sent from my iPad

On Sep 29, 2013, at 9:53 PM, Joh= n Smith <john@jjts.net.au> wro= te:

I too h= ave this same issue with slight movement of the engine mount. No cracks evid= ent =E2=80=93 fortunately.

Even after setting the g= ear down pressure as low as possible yet still allow the gear to extend prop= erly, and having adjusted the actuator length so there is no actuator load o= n the assembly in the down and locked position.

So I= checked for free movement etc of the strut, the links etc =E2=80=93 all fin= e, no binding anywhere. Having disconnected the over-centre links from the n= ose strut, I yanked the over centre links up and down =E2=80=93 what I found= was that the engine mount moved forwards and backwards a few millimetr= es simply due to the leverage acting on the engine mount / over-centre link f= rom hydraulic cylinder (even with dump valve open).  The mount really d= oesn't appear to be strong enough. My kit was a 2008 supply, and I believe t= he "design" changed a few years before this=E2=80=A6=E2=80=A6 I understand e= arlier mounts are somewhat more robust in this area.

I have 4.5MB video if anyone interested =E2=80=93 but send me an email dir= ectly and I'll forward as too large to post on the forum, I think.

After some discussion with a professional builder, I am now w= orking on making up some carbon fillets (prob around 12 BID, and similar in c= oncept to the upper engine mount fillets reinforce the upper engine mount bo= lts).  The idea is to flox these in behind the firewall and up against t= he side of the nose gear tunnel. Care obviously needed to make sure they cle= ar the strut / fork on retraction, but idea is to size / position these such= that each can accommodate an AN4 bolt that penetrates the firewall a fracti= on inboard of the engine mount plate and immediately adjacent the nose gear o= ver-centre link mounting point brackets and pulls up on clamp pieces machine= d to fit over / inside the bracket.  I'm hoping this will be sufficient= to stop the mount moving forward, and also reinforce support behind the eng= ine mount  when there aft loads on these nose gear brace points.
<= div>
Appreciate any comments and others' experiences / solutio= ns or alternative ideas (other than removing engine, removing engine mount, a= nd reinforcing the engine mount and putting it all back together again=E2=80= =A6!)

=
Regar= ds,

John

VH-XTZ  Kit #323



John N G Smith
Tel / fax:    +61-8-9385-8891
Mobile:      +61-409-372-975
Email:         john@jjts.net.au

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