X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 22 Dec 2010 07:51:26 -0500 Message-ID: X-Original-Return-Path: Received: from raven.ravenwebhosting.com ([72.9.254.67] verified) by logan.com (CommuniGate Pro SMTP 5.3.11) with ESMTPS id 4649814 for lml@lancaironline.net; Tue, 21 Dec 2010 14:08:09 -0500 Received-SPF: none receiver=logan.com; client-ip=72.9.254.67; envelope-from=paul@tbm700.com Received: from 111-57.202-68.tampabay.res.rr.com ([68.202.57.111]:53805 helo=[192.168.1.102]) by raven.ravenwebhosting.com with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.69) (envelope-from ) id 1PV7Yc-0000r3-1i for lml@lancaironline.net; Tue, 21 Dec 2010 14:07:34 -0500 From: paul miller Mime-Version: 1.0 (Apple Message framework v1082) Content-Type: multipart/alternative; boundary=Apple-Mail-5--1028844776 Subject: Re: [LML] Cowling Deformation X-Original-Date: Tue, 21 Dec 2010 12:07:31 -0700 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: X-Mailer: Apple Mail (2.1082) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - raven.ravenwebhosting.com X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - tbm700.com X-Source: X-Source-Args: X-Source-Dir: --Apple-Mail-5--1028844776 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Injecting my comments regarding TSIO-520 and my current io-550: the = movement of cowl relative to engine (therefore spinner) is dramatic. = In tests I did to resolve interference issues in a C414A and my Lancair = Legacy I determined through witness marks, scuffing, dabs of TorqueSeal = and spray paint I determined that the engine moves forward, down and = counter to prop rotation. In the front, it can be 1-2 inches forward, = a circular twist of at least an inch at the rocker cover and a downward = movement of an inch or more. All this relative to the cowl and = permitted by the flexing of the engine mounts and dependent upon = horsepower and trq. I can't recall Lorne's setup but his numbers do not = appear unreasonable given my results. Just spray some light white = primer inside the cowl and you can see the extent of any movement after = a flight relative to baffling. If the cowl itself is deforming, that is = another variable.=20 Paul M L2K On 2010-12-21, at 11:24 AM, rwolf99@aol.com wrote: >=20 > <> > =20 > Wow! Lorn, you're talking about the back section of the scoop = deforming upwards, I hope? I mean, you're not suggesting that the front = of the cowling elevates 1.5 inches relative to the spinner? > =20 > I can see how the scoop might deform near the back -- I just pushed on = mine with my hand and it deformed almost an inch. But I can't seem to = make it move significantly near the front. > =20 > Please let us know if that's what you meant. > =20 > - Rob >=20 >=20 --Apple-Mail-5--1028844776 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii rwolf99@aol.com = wrote:

<<When in flight, the bottom of my = cowling is compressed upwards by about 1.5" to 2". Make sure you do not = have anything that this compression could effect.>>

Wow! Lorn, you're talking about = the back section of the scoop deforming upwards, I hope? I mean, = you're not suggesting that the front of the cowling elevates 1.5 inches = relative to the spinner?

I can see how the scoop might deform = near the back -- I just pushed on mine with my hand and it deformed = almost an inch. But I can't seem to make it move significantly = near the front.

Please let us know if that's what you = meant.

- Rob

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