X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao103.cox.net ([68.230.241.43] verified) by logan.com (CommuniGate Pro SMTP 5.2.3) with ESMTP id 2977595 for flyrotary@lancaironline.net; Sat, 21 Jun 2008 00:15:11 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.43; envelope-from=rv-4mike@cox.net Received: from fed1rmimpo01.cox.net ([70.169.32.71]) by fed1rmmtao103.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20080621041422.TCSR1276.fed1rmmtao103.cox.net@fed1rmimpo01.cox.net> for ; Sat, 21 Jun 2008 00:14:22 -0400 Received: from wills ([68.105.85.56]) by fed1rmimpo01.cox.net with bizsmtp id gUEW1Z0081CvZmk03UEXUq; Sat, 21 Jun 2008 00:14:32 -0400 Message-ID: <006a01c8d355$4d9e4cc0$38556944@wills> From: "Mike Wills" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Another Turbo Bites the dust Date: Fri, 20 Jun 2008 21:14:30 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0067_01C8D31A.A0F59A80" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 This is a multi-part message in MIME format. ------=_NextPart_000_0067_01C8D31A.A0F59A80 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dave, Stating the obvious, that sucks. I assume you run synthetic oil? Is the = center housing water cooled? Mike Wills RV-4 N144MW ----- Original Message -----=20 From: David Leonard=20 To: Rotary motors in aircraft=20 Sent: Friday, June 20, 2008 8:47 PM Subject: [FlyRotary] Another Turbo Bites the dust Today I flew from San Diego to Brownville Texas to attend a formation = flying clinic. After 6 hours of WOT flight I was descending through = 5000' (down from 15.5k) an just a few miles from the airport when I had = a sudden and sickening drop in manifold pressure. The engine was still = running fine, and I had plenty of altitude to make the runway, so I = continued on debating weather or not to flip the turbo oil shutoff = switch. I had grown to respect this turbo so much that I finally = decided that I had just blown out a fitting somewhere in the intake = system downstream of the turbo. I even continued on to a low pass for = show rather than just landing. When I eventually had time to take off = the cowl I was dissapointed to find that all the fitting were in place = and that the compressor wheel turns only with significant resistance. So the turbo is dead, and I am out of the formation clinic and will = have to decide tomorrow about flying home with a dead turbo. Will maybe = be able to take a look in the hot side and see what I see. This turbo was the TO4 hybrid with a fixed wide open waste gate. It = had 130 hrs of mostly hard duty. Sigh. --=20 David Leonard Turbo Rotary RV-6 N4VY http://N4VY.RotaryRoster.net http://RotaryRoster.net ------=_NextPart_000_0067_01C8D31A.A0F59A80 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Dave,
 
 Stating the obvious, that sucks. = I assume you=20 run synthetic oil? Is the center housing water cooled?
 
Mike Wills
RV-4 N144MW
----- Original Message -----
From:=20 David=20 Leonard
Sent: Friday, June 20, 2008 = 8:47 PM
Subject: [FlyRotary] Another = Turbo Bites=20 the dust

Today I flew from San Diego to Brownville Texas to = attend a=20 formation flying clinic.  After 6 hours of WOT flight I was = descending=20 through 5000' (down from 15.5k) an just a few miles from the airport = when I=20 had a sudden and sickening drop in manifold pressure.   The = engine=20 was still running fine, and I had plenty of altitude to make the = runway, so I=20 continued on debating weather or not to flip the turbo oil shutoff=20 switch.  I had grown to respect this turbo so much that I finally = decided=20 that I had just blown out a fitting somewhere in the intake system = downstream=20 of the turbo.  I even continued on to a low pass for show rather = than=20 just landing.  When I eventually had time to take off the cowl I = was=20 dissapointed to find that all the fitting were in place and that the=20 compressor wheel turns only with significant resistance.

So the = turbo=20 is dead, and I am out of the formation clinic and will have to decide = tomorrow=20 about flying home with a dead turbo.  Will maybe be able to take = a look=20 in the hot side and see what I see.

This turbo was the TO4 = hybrid with=20 a fixed wide open waste gate.  It had 130 hrs of mostly hard = duty. =20 Sigh.

--
David Leonard

Turbo Rotary RV-6 = N4VY
http://N4VY.RotaryRoster.nethttp://RotaryRoster.net=20 ------=_NextPart_000_0067_01C8D31A.A0F59A80--