Return-Path: Received: from fed1rmmtao05.cox.net ([68.230.241.34] verified) by logan.com (CommuniGate Pro SMTP 4.2.9) with ESMTP id 710043 for flyrotary@lancaironline.net; Sun, 06 Feb 2005 00:49:08 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.34; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao03.cox.net (InterMail vM.6.01.04.00 201-2131-117-20041022) with ESMTP id <20050206043803.QTZF4519.fed1rmmtao03.cox.net@BigAl> for ; Sat, 5 Feb 2005 23:38:03 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] exhaust drift Date: Sat, 5 Feb 2005 20:38:10 -0800 Message-ID: <000001c50c05$a983bcc0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C50BC2.9B607CC0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C50BC2.9B607CC0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable That is very interesting and surprising. High temperature visco-elastic creep. What is the TOT? I wouldn't have thought it high enough; but in = any case, it suggests that intergranular stress corrosion of the SS could = also be ocurring. It may be good to inspect the hottest portions of that = pipe fairly frequently. =20 Al =20 Subject: [FlyRotary] exhaust drift =20 I wanted to tell everyone about a phenomanom I have noticed. My = exhaust is drifting backward with the force of the airstream. My exhaust comes straight off the turbo, down and out. When first installed it used to = butt up against the leading edge of the cowl cut-out. I now have 90 hours. After enlarging the aft portion of the hole twice over that time I = finally accepted the fact that it is slowly drifting with the force of the slip stream. It first I was worried about the mount or the exhaust welds, = but those are holding up fine. =20 Last night I installed some springs to apply a counter force forward, = then I went flying (looking for any excuse). After just 45 min of flying the exhaust forward about 2 mm. Once the exhaust is centered again I will adjust the tension on the springs to just counter balance the force of = the slip stream. =20 The alternative would be to build a nice fairing around the exhaust, something I may eventually get to. =20 Dave Leonard ------=_NextPart_000_0001_01C50BC2.9B607CC0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable [FlyRotary] Re: Performance coatings- bearing damage?

That is very interesting and surprising.  High temperature visco-elastic creep.  What is the TOT?  I = wouldn’t have thought it high enough; but in any case, it suggests that = intergranular stress corrosion of the SS could also be ocurring.  It may be good = to inspect the hottest portions of that pipe fairly = frequently.

 

Al

 

Subject: [FlyRotary] exhaust drift

 

   I = wanted to tell everyone about a phenomanom I have noticed.  My exhaust is = drifting backward with the force of the airstream.  My exhaust comes = straight off the turbo, down and out.  When first installed it used to butt up = against the leading edge of the cowl cut-out.  I now have 90 hours.  = After enlarging the aft portion of the hole twice over that time I finally = accepted the fact that it is slowly drifting with the force of the slip = stream.  It first I was worried about the mount or the exhaust welds, but those are = holding up fine.

 

Last night I = installed some springs to apply a counter force forward, then I went flying = (looking for any excuse).  After just 45 min of flying the exhaust forward = about 2 mm.  Once the exhaust is centered again I will adjust the tension = on the springs to just counter balance the force of the slip = stream.

 

The alternative = would be to build a nice fairing around the exhaust, something I may eventually = get to.

 

Dave = Leonard

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