X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 08 Oct 2013 07:55:47 -0400 Message-ID: X-Original-Return-Path: <2thman1@gmail.com> Received: from mail-yh0-f44.google.com ([209.85.213.44] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTPS id 6506079 for lml@lancaironline.net; Mon, 07 Oct 2013 19:27:55 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.213.44; envelope-from=2thman1@gmail.com Received: by mail-yh0-f44.google.com with SMTP id f64so1938301yha.3 for ; Mon, 07 Oct 2013 16:27:22 -0700 (PDT) X-Received: by 10.236.203.2 with SMTP id e2mr3972049yho.60.1381188442594; Mon, 07 Oct 2013 16:27:22 -0700 (PDT) X-Original-Return-Path: <2thman1@gmail.com> Received: from [192.168.1.107] ([12.218.123.2]) by mx.google.com with ESMTPSA id 9sm47487233yhd.19.1969.12.31.16.00.00 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 07 Oct 2013 16:27:22 -0700 (PDT) Subject: Cabin door strut on IV series From: John Barrett <2thman1@gmail.com> Content-Type: multipart/alternative; boundary=Apple-Mail-AD449781-6128-4F22-95E5-8E8C3D2F40F2 X-Mailer: iPad Mail (10B329) X-Original-Message-Id: <947E70D6-53A9-403B-AB4A-C0CE94EEC580@gmail.com> X-Original-Date: Mon, 7 Oct 2013 19:27:21 -0400 X-Original-To: Lancair Mailing List Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) --Apple-Mail-AD449781-6128-4F22-95E5-8E8C3D2F40F2 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Hi all, I have to say that my first attendance to a LOBO fly in was awesome ( to use= my children's and their children's cliche). The chance to meet so many ent= husiastic, knowledgeable and fun Lancair folks provided WAY more benefit tha= n I ever would have imagined. Thank you to the board, the vendors, presente= rs and to everyone involved. I loved it and so did my wife, Anne. =20 I saw some folks examining a IVP door strut on Saturday I think. The attach= ment at the frame was very loose so that the ball stud was flopping around. = Close inspection showed that the door frame was cracked under the stud. I'= m not sure whose plane this was but I think it is the one that vibration mea= surement equipment had recently been attached to for studies. The door strut triggered memories of similar occurrence with my strut a cou= ple of years ago prior to first flight. I would guess the smart folks who n= oticed this also figured out the reason for the failure, but just in case I w= ill share what I found and how I dealt with it. The problem with the door strut is that the arc described by the strut durin= g opening and closing exceeds the range of motion built into the ball stud s= ocket on the lower end of the strut. Therefore the door frame is wrenched b= ack and forth during door operation when the stud is attached to the door fr= ame without modification to the frame. There is a plane you can find by exp= erimentation or by mathematical exercise if you are so gifted and inclined t= o pursue (I am not) that will allow the socket to move within the design lim= its and therefore not stress the stud and the door frame. Once this plane i= s determined, you can use a small washer of wood, foam or other material to s= hape the door frame where the stud penetrates the frame. You'll need to cut= out a bit of the frame to accomplish this. since my frame was broken here i= t made that part simple. Super glue or hot glue can hold the form in place.= Then lay up two BID of carbon fibre cloth over the form and remove the for= m material when done. Lay up several layers on the back side to strengthen t= he mod and to secure it by sandwiching on both sides of remaining frame.=20 It gets a little more complicated because the back side in my case was in ve= ry tight quarters. When complete I found that the screw stud on the ball stu= d part was too short. I was able to go online and find a replacement at ver= y nominal cost and that had plenty of thread length for the purpose. I have uploaded a video to YouTube of the way the attachment looks now. See= link below. I hope it helps someone. http://youtu.be/d3sBMgVncMM John Barrett N31VP Sent from my iPad --Apple-Mail-AD449781-6128-4F22-95E5-8E8C3D2F40F2 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Hi all,

=
I have to say that my first a= ttendance to a LOBO fly in was awesome ( to use my children's and their chil= dren's cliche).  The chance to meet so many enthusiastic, knowledgeable= and fun Lancair folks provided WAY more benefit than I ever would have imag= ined.  Thank you to the board, the vendors, presenters and to everyone i= nvolved.  I loved it and so did my wife, Anne.  

I saw some folks examining a IVP door strut on Saturday I t= hink.  The attachment at the frame was very loose so that the ball stud= was flopping around.  Close inspection showed that the door frame was c= racked under the stud.  I'm not sure whose plane this was but I think i= t is the one that vibration measurement equipment had recently been attached= to for studies.

The door strut triggered= memories of  similar occurrence with my strut a couple of years ago pr= ior to first flight.  I would guess the smart folks who noticed this al= so figured out the reason for the failure, but just in case I will share wha= t I found and how I dealt with it.

The problem with the door strut is t= hat the arc described by the strut during opening and closing exceeds the ra= nge of motion built into the ball stud socket on the lower end of the strut.=  Therefore the door frame is wrenched back and forth during door opera= tion when the stud is attached to the door frame without modification to the= frame.  There is a plane you can find by experimentation or by mathema= tical exercise if you are so gifted and inclined to pursue (I am not) that w= ill allow the socket to move within the design limits and therefore not stre= ss the stud and the door frame.  Once this plane is determined, you can= use a small washer of wood, foam or other material to shape the door frame w= here the stud penetrates the frame.  You'll need to cut out a bit of th= e frame to accomplish this.  since my frame was broken here it made tha= t part simple.  Super glue or hot glue can hold the form in place. &nbs= p;Then lay up two BID of carbon fibre cloth over the form and remove the for= m material when done.  Lay up several layers on the back side to streng= then the mod and to secure it by sandwiching on both sides of remaining fram= e. 

It gets a little more complicated because the back side in m= y case was in very tight quarters. When complete I found that the screw stud= on the ball stud part was too short.  I was able to go online and find= a replacement at very nominal cost and that had plenty of thread length for= the purpose.

I have uploaded a video to= YouTube of the way the attachment looks now.  See link below.  I h= ope it helps someone.

<= a href=3D"http://youtu.be/d3sBMgVncMM" style=3D"-webkit-text-size-adjust: au= to; ">http://youtu.be/d3sBMgVncMM

John Barrett
N31VP

Sent= from my iPad

= --Apple-Mail-AD449781-6128-4F22-95E5-8E8C3D2F40F2--