X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 29 Sep 2013 22:53:59 -0400 Message-ID: X-Original-Return-Path: Received: from nschwmtas02p.mx.bigpond.com ([61.9.189.140] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTP id 6494824 for lml@lancaironline.net; Sun, 29 Sep 2013 07:36:11 -0400 Received-SPF: none receiver=logan.com; client-ip=61.9.189.140; envelope-from=john@jjts.net.au Received: from nschwcmgw05p ([61.9.190.165]) by nschwmtas02p.mx.bigpond.com with ESMTP id <20130929113533.MITO2047.nschwmtas02p.mx.bigpond.com@nschwcmgw05p> for ; Sun, 29 Sep 2013 11:35:33 +0000 Received: from [192.168.15.15] ([110.142.219.220]) by nschwcmgw05p with BigPond Outbound id WzbW1m00H4luXCm01zbXg9; Sun, 29 Sep 2013 11:35:33 +0000 X-Authority-Analysis: v=2.0 cv=RegS+iRv c=1 sm=1 a=6xIvA0WTx9AVOJiHBW+VeQ==:17 a=KWCKX4AzZ3IA:10 a=pA9Kvn6R6iAA:10 a=mCSqThwqAAAA:8 a=lKKlc2ILHMwA:10 a=cLb438RWjx6OO05ROLkA:9 a=wPNLvfGTeEIA:10 a=rnYgdqcAs4AA:10 a=wciTXWkwzoQWdzgqPSwA:9 a=_W_S_7VecoQA:10 a=SYmM97K6Vwa79QTQ:21 a=6xIvA0WTx9AVOJiHBW+VeQ==:117 User-Agent: Microsoft-MacOutlook/14.3.7.130812 X-Original-Date: Sun, 29 Sep 2013 19:35:31 +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_3463328134_1089924" > 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_3463328134_1089924 Content-type: text/plain; charset="ISO-8859-1" Content-transfer-encoding: quoted-printable I too have this same issue with slight movement of the engine mount. No cracks evident =AD fortunately. Even after setting the gear down pressure as low as possible yet still allo= w 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. So I checked for free movement etc of the strut, the links etc =AD all fine, 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 that the engine mount moved forwards and backwards a few millimetres simply due to the leverage acting on the engine mount / over-centre link from hydrauli= c cylinder (even with dump valve open). The mount really doesn't appear to b= e strong enough. My kit was a 2008 supply, and I believe the "design" changed a few years before this=8A=8A I understand earlier mounts are somewhat more robust in this area. 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. 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 t= o the upper engine mount fillets reinforce the upper engine mount bolts). Th= e 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 / 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-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' experiences / solutions or alternative ideas (other than removing engine, removing engine mount, and reinforcing the engine mount and putting it all back together again=8A!) Regards, 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 --B_3463328134_1089924 Content-type: text/html; charset="ISO-8859-1" Content-transfer-encoding: quoted-printable
I too have this same is= sue with slight movement of the engine mount. No cracks evident – fort= unately.

Even after setting the gear down pressure = as low as possible yet still allow the gear to extend properly, and having a= djusted 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 etc – all fine, no binding anywh= ere. Having disconnected the over-centre links from the nose strut, I yanked= the over centre links up and down – what I found was that the en= gine mount moved forwards and backwards a few millimetres simply due to the = leverage acting on the engine mount / over-centre link from hydraulic cylind= er (even with dump valve open).  The 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 somewh= at more robust in this area.

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 engi= ne 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 nose gea= r tunnel. Care obviously needed to make sure they clear the strut / fork on = retraction, but idea is to size / position these such that each can accommod= ate an AN4 bolt that penetrates the firewall a fraction inboard of the engin= e mount plate and immediately adjacent the nose gear over-centre link mounti= ng 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 mov= ing forward, and also reinforce support behind the engine mount  when t= here aft loads on these nose gear brace points.

App= reciate any comments and others' experiences / solutions or alternative idea= s (other than removing engine, removing engine mount, and reinforcing the en= gine mount and putting it all back together again…!)



Regards,

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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