X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from omr-d10.mx.aol.com ([205.188.108.134] verified) by logan.com (CommuniGate Pro SMTP 6.0.9e) with ESMTPS id 6917213 for lml@lancaironline.net; Tue, 03 Jun 2014 08:16:53 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.108.134; envelope-from=Sky2high@aol.com Received: from mtaomg-aan01.mx.aol.com (mtaomg-aan01.mx.aol.com [172.27.19.79]) by omr-d10.mx.aol.com (Outbound Mail Relay) with ESMTP id 17FCE700496C1 for ; Tue, 3 Jun 2014 08:16:19 -0400 (EDT) Received: from core-mle002c.r1000.mail.aol.com (core-mle002.r1000.mail.aol.com [172.29.126.199]) by mtaomg-aan01.mx.aol.com (OMAG/Core Interface) with ESMTP id DBFB138000085 for ; Tue, 3 Jun 2014 08:16:18 -0400 (EDT) From: Sky2high@aol.com Full-name: Sky2high Message-ID: Date: Tue, 3 Jun 2014 08:16:18 -0400 (EDT) Subject: Re: [LML] Re: Undercarriage bolt clearance To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; 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Rob,
 
Bummer.
 
Grinding down the bolt head (and rounding it) is a possibility because= of=20 its use in shear - as long as it cannot ever catch on GM4 - especially when= the=20 gear comes down.
 
You could revert to the screen door springs (GM10) and rid yourself of= the=20 rat-trap springs and the washers you used to make that work.
 
Scott
 
In a message dated 6/3/2014 6:56:10 A.M. Central Daylight Time,=20 stevens5@swiftdsl.com.au writes:
=

Scott=20 & Aaron,

 

You=20 guys got me thinking around this problem a lot more. So I took some more= =20 measurements, and now think I have worked out what is wrong. It appears t= he=20 original builder placed the rear face of the  GM 13 about =C2=BC=E2= =80=9D further back=20 than the rear face of GM 12. (This is a very early kit. I think later kit= s=20 came with the GM 13 already installed, if I understand correctly). This h= as=20 resulted in the gear leg and the GM 4 not being parallel when the gear le= g is=20 in the wheel well.

 

The=20 solution is not going to be easy however. Firstly because I have already= =20 incorporated the support brace for the GM 13 between it and the upper spa= r=20 cap, and secondly because even if I fix that problem, the rear face of th= e GM=20 12 would need to be set at a slightly different angle (in relation to the= =20 lateral axis of the aircraft) to take up the new alignment of the GM 4. A= s it=20 is , the AN4-13A bolts which bolt the GM 12 to the GM 4 are only just lon= g=20 enough, and the top ones which have to be placed with the heads to the fr= ont=20 only just fit into the space between the spar web and the front face of= =20 the  GM 12 when installing them. So installing longer bolts appears= =20 impossible. Thus I can=E2=80=99t simply build up the rear face of GM 12 w= ith a couple=20 more BID to correct the misalignment. The only other option I can see wou= ld be=20 to grind away the 2 bid and =C2=BD=E2=80=9D phenolic which make up the GM= 12, to the=20 correct angle, and then re-apply 2 bid over that. Given the significance = of=20 this structure to the integrity of the whole undercarriage, I am not sure= this=20 is an acceptable solution.

 

As=20 I said earlier, I don=E2=80=99t have any engineering qualifications, so I= am only=20 guessing at the structural issues all of this raises. I know that the sim= plest=20 solution is to grind the bolt heads down, but I am again only guessing wh= ether=20 this would compromise anything that really matters.

 

Ah,=20 the joys of home building!

 

Thanks=20 guys for your support.

 

Rob=20

 

From:


= Posted=20 for Aaron Collins <nwacollins@centurytel.net&g= t;:


>=20 Rob, Scott,
>
> Could this be a possible solution and/or=20 addition? . . .
>
> If the original builder had to add any B= ID=20 between the aft GM5 plate and
>the forward face of the rear center= spar=20 to take up any fore to aft slack of
>the GM1 weldment, could that = BID=20 be removed to gain some clearance room? Of
>course, you would prob= ably=20 have to add back the same bid to the aft face of
>the GM12 and GM1= 3=20 phenolic mounting points so as to take up that same fore to
>aft s= lack=20 that existed originally.
>
> If there is BID behind the GM5 = and=20 you remove it for clearance, the
>original bolts mounting the GM5= =20 through the aft spar may now be a bit too
>long. Scott is always g= ood=20 to remind us about proper bolt length so check
>that thread=20 count.
>
> Regards,
>
>=20 Aaron

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