Return-Path: Received: from [65.54.169.106] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2911075 for flyrotary@lancaironline.net; Tue, 30 Dec 2003 14:12:49 -0500 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Tue, 30 Dec 2003 11:12:48 -0800 Received: from 64.159.104.203 by bay3-dav76.bay3.hotmail.com with DAV; Tue, 30 Dec 2003 19:12:48 +0000 X-Originating-IP: [64.159.104.203] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: evap coremounting Date: Tue, 30 Dec 2003 14:12:47 -0500 MIME-Version: 1.0 X-Mailer: MSN Explorer 7.02.0011.2700 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0001_01C3CEDF.00771960" Message-ID: X-OriginalArrivalTime: 30 Dec 2003 19:12:48.0534 (UTC) FILETIME=[E9C73360:01C3CF08] ------=_NextPart_001_0001_01C3CEDF.00771960 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Wow, there is no way to really discuss this subject in a quick email but = I can summarize by saying that "solidly mounted" covers a lot of ground. = You might think a picture would tell the whole story but it doesn't. By one definition, my cores are solidly mounted because there is a solid = metal connection between engine mount (solidly bolted to engine) and the = bracket holding the cores. The connection is a piece of 3/16 thick 4130= flat stock that is rigidly bolted to the mount with the core cantilevere= d out on the other end. This forms a spring of unknown rate. The spring= is more or less optimally oriented so that the primary vibration vector = is bending this spring. The U shaped brackets holding the cores are lined with a 1/8" thick rubbe= r sheet to eliminate chaffing & point contact loads on the rather fragile= core. The top & bottom U brackets are clamped lightly together by 4 th= readed rods. Lightly is another fuzzy term but an important one. It de= termines the amount of compliance in this part of the system. This system has flown for > 1350 hours over a period of 10 years and not = failed. I suspect it would last no more than a few hours if it were on a= Lycoming. Bottom line: The cores are not really solidly mounted and details matte= r (a lot). =20 Tracy Crook --- Original Message --- From: "Russell Duffy" <13brv3@bellsouth.net> To: "Rotary motors in aircraft" =20 Subject: [FlyRotary] Re: aluminum hose bungs/fittings, =20 evap core mounting >OK, there are a number of you out there that have =20 cores mounted to the engine. Do you have them solidly =20 mounted, or are they on an effective cushion of some =20 type? Can you post some pics? Has vibration been an =20 issue with any of your mounting methods? =20 >Thanks, >Rusty (shaken, not stirred) >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_001_0001_01C3CEDF.00771960 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
<= DIV>Wow, there is no way to really discuss this subject in a quick email = but I can summarize by saying that "solidly mounted" covers a lot of= ground.  You might think a picture would tell the whole story but i= t doesn't.
 
By one definition, my cores are s= olidly mounted because there is a solid metal connection between engine m= ount (solidly bolted to engine) and the bracket holding the cores. &= nbsp; The connection is a piece of 3/16 thick 4130 flat stock that i= s rigidly bolted to the mount with the core cantilevered out on the = other end.  This forms a spring of unknown rate.  The spring is= more or less optimally oriented so that the primary vibration vector is = bending this spring.
 
The U shaped brackets h= olding the cores are lined with a 1/8" thick rubber sheet to elimina= te chaffing & point contact loads on the rather fragile core. &n= bsp; The top & bottom U brackets are clamped lightly together by= 4 threaded rods.   Lightly is another fuzzy term but an import= ant one.  It determines the amount of compliance in this part o= f the system.
 
This system has flown for >= 1350 hours over a period of 10 years and not failed.  I suspect it = would last no more than a few hours if it were on a Lycoming.
=  
Bottom line:   The cores are not really solid= ly mounted and details matter  (a lot). 
 = ;
Tracy Crook
--- Original Message ---
From: "Russell Duffy" <13brv= 3@bellsouth.net>
To: "Rotary motors in aircraft"
<flyrotary@= lancaironline.net>
Subject: [FlyRotary] Re: aluminum hose bungs/fit= tings,
evap core mounting

>OK, there are a number of you ou= t there that have
cores mounted to the engine.  Do you have them= solidly
mounted, or are they on an effective cushion of some
typ= e?  Can you post some pics?  Has vibration been an
issue wi= th any of your mounting methods?
>Thanks,
>Rusty (shaken, no= t stirred)



>>  Homepage:  http://www.flyro= tary.com/
>>  Archive:   http://lancaironline.net= /lists/flyrotary/List.html
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