X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 30 Sep 2013 12:56:36 -0400 Message-ID: X-Original-Return-Path: Received: from nschwmtas03p.mx.bigpond.com ([61.9.189.143] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTP id 6495932 for lml@lancaironline.net; Mon, 30 Sep 2013 09:49:20 -0400 Received-SPF: none receiver=logan.com; client-ip=61.9.189.143; envelope-from=john@jjts.net.au Received: from nschwcmgw06p ([61.9.190.166]) by nschwmtas03p.mx.bigpond.com with ESMTP id <20130930134843.EZTF2008.nschwmtas03p.mx.bigpond.com@nschwcmgw06p> for ; Mon, 30 Sep 2013 13:48:43 +0000 Received: from [192.168.15.15] ([110.142.219.220]) by nschwcmgw06p with BigPond Outbound id XRog1m00Z4luXCm01RohV9; Mon, 30 Sep 2013 13:48:43 +0000 X-Authority-Analysis: v=2.0 cv=dewCLAre c=1 sm=1 a=6xIvA0WTx9AVOJiHBW+VeQ==:17 a=KWCKX4AzZ3IA:10 a=pA9Kvn6R6iAA:10 a=mCSqThwqAAAA:8 a=lKKlc2ILHMwA:10 a=3oc9M9_CAAAA:8 a=Ia-xEzejAAAA:8 a=jjqUt_clAAAA:8 a=dr054kMTZWCPTCTHbRMA:9 a=wPNLvfGTeEIA:10 a=DNEv3uQ8dJUA:10 a=-ZBvsNeBbbMA:10 a=rnYgdqcAs4AA:10 a=U8Ie8EnqySEA:10 a=EzXvWhQp4_cA:10 a=4vYbuxWWRz-qsz28oOYA:9 a=_W_S_7VecoQA:10 a=QUtqKfdTuJ7SQ5_f:21 a=6xIvA0WTx9AVOJiHBW+VeQ==:117 User-Agent: Microsoft-MacOutlook/14.3.7.130812 X-Original-Date: Mon, 30 Sep 2013 21:48:40 +0800 Subject: Re: [LML] Re: Engine Mount Crack From: John Smith X-Original-To: Lancair Mailing List X-Original-Message-ID: Thread-Topic: [LML] Re: Engine Mount Crack In-Reply-To: Mime-version: 1.0 Content-type: multipart/alternative; boundary="B_3463422523_2008129" > This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --B_3463422523_2008129 Content-type: text/plain; charset="ISO-8859-1" Content-transfer-encoding: quoted-printable Yes. Hadn't heard of the "issue". Regards, John =20 John N G Smith Tel / fax: +61-8-9385-8891 Mobile: +61-409-372-975 Email: john@jjts.net.au From: Reply-To: Lancair Mailing List Date: Monday, 30 September 2013 8:59 PM To: Subject: [LML] Re: Engine Mount Crack > Has anyone talked to Lancair or the build shops like Mark Mahnke about th= is? >=20 > Jeff >=20 > Sent from my iPad >=20 > On Sep 29, 2013, at 9:53 PM, John Smith wrote: >=20 >> I too have this same issue with slight movement of the engine mount. No >> cracks evident =AD fortunately. >>=20 >> Even after setting the gear down pressure as low as possible yet still a= llow >> the gear to extend properly, and having adjusted the actuator length so = there >> 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 =AD all fin= e, no >> binding anywhere. Having disconnected the over-centre links from the nos= e >> strut, I yanked the over centre links up and down =AD what I found was tha= t the >> engine mount moved forwards and backwards a few millimetres simply due t= o the >> leverage acting on the engine mount / over-centre link from hydraulic >> cylinder (even with dump valve open). The mount really doesn't appear t= o be >> strong enough. My kit was a 2008 supply, and I believe the "design" chan= ged a >> few years before this=8A=8A I understand earlier mounts are somewhat more ro= bust >> in this area. >>=20 >> I have 4.5MB video if anyone interested =AD but send me an email directly = 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 m= aking >> 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= idea >> 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 >> accommodate an AN4 bolt that penetrates the firewall a fraction inboard = of >> the engine mount plate and immediately adjacent the nose gear over-centr= e >> link mounting point brackets and pulls up on clamp pieces machined to fi= t >> over / inside the bracket. I'm hoping this will be sufficient to stop t= he >> mount moving forward, and also reinforce support behind the engine mount >> when there aft loads on these nose gear brace points. >>=20 >> Appreciate any comments and others' experiences / solutions or alternati= ve >> ideas (other than removing engine, removing engine mount, and reinforcin= g the >> engine mount and putting it all back together again=8A!) >>=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 --B_3463422523_2008129 Content-type: text/html; charset="ISO-8859-1" Content-transfer-encoding: quoted-printable
Yes.  Hadn't = heard of the "issue".



Regards,

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

=
From= : <vtailjeff@aol.com>Reply-To: Lancair Mailing List <= lml@lancaironline.net>
Date: Monday, 30 September 2013 8:59 PMTo: <lml@lancaironline.net>
= Subject: [LML] Re: Engine Mount Crack

Ha= s anyone talked to Lancair or the build shops like Mark Mahnke about this?

Jeff

Sent from my iPad

On Sep 2= 9, 2013, at 9:53 PM, John Smith <john@j= jts.net.au> wrote:

I too have this same issue with slight movement of the engine m= ount. No cracks evident – fortunately.

Even a= fter setting the gear down pressure as low as possible yet still allow the g= ear to extend properly, and having adjusted the actuator length so there is = no actuator load on the assembly in the down and locked position.
=
So I checked for free movement etc of the strut, the links et= c – all fine, no binding anywhere. Having disconnected the over-centre= links from the nose strut, I yanked the over centre links up and down ̵= 1; what I found was that the engine mount moved forwards and backwards = a few millimetres simply due to the leverage acting on the engine mount / ov= er-centre link from hydraulic cylinder (even with dump valve open).  Th= e mount really doesn't appear to be strong enough. My kit was a 2008 supply,= and I believe the "design" changed a few years before this…… I = understand earlier mounts are somewhat more robust in this area.
<= br>
I have 4.5MB video if anyone interested – but send me an= email directly and I'll forward as too large to post on the forum, I think.=

After some discussion with a professional builder,= I am now working on making up some carbon fillets (prob around 12 BID, and = similar in concept to the upper engine mount fillets reinforce the upper eng= ine mount bolts).  The idea is to flox these in behind the firewall and= up against the side of the nose gear tunnel. Care obviously needed to make = sure they clear the strut / fork on retraction, but idea is to size / positi= on these such that each can accommodate an AN4 bolt that penetrates the fire= wall a fraction inboard of the engine mount plate and immediately adjacent t= he 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 moving forward, and also reinforce support = behind the engine mount  when there aft loads on these nose gear brace = points.

Appreciate any comments and others' experie= nces / solutions or alternative ideas (other than removing engine, removing = engine mount, and reinforcing the engine mount and putting it all back toget= her again…!)


Regards,<= /div>
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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