X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from rv-out-0506.google.com ([209.85.198.237] verified) by logan.com (CommuniGate Pro SMTP 5.2.3) with ESMTP id 2977596 for flyrotary@lancaironline.net; Sat, 21 Jun 2008 00:18:43 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.198.237; envelope-from=wdleonard@gmail.com Received: by rv-out-0506.google.com with SMTP id f6so6977477rvb.7 for ; Fri, 20 Jun 2008 21:18:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:in-reply-to:mime-version:content-type:references; bh=1kHXGBRtfJ1XuLfRGZ2cYlRZqb8KGAmpvbOKOp9tld8=; b=GmTZ6Kxh/hQItZBdOstVvYWooRBC2GLsusKMk80gHQqkXWUPZDPedZoNpjb3lZHxUv 0hrviKM9I3HWb/KaJ8hB951Q4iCzII78oeMAlGkjNc9ZzTXDHZeaUNfvS/qfaH++uJp2 6OsfviGExymb+WAdvxnjEQ65L9QIMrKAktuxU= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:in-reply-to:mime-version :content-type:references; b=j9/kQSExYlLUtJQ9WgK8RQf2s4zm0jhE6ZaNpzhznX8Vi5aldBSRZn7LuVGTtLaauS Zd3mgHQ/OpP1nVuY/0cZv4WHm3rrNHT8aB5hKX/+SWmmhdtm4nq89MkLmQ2EKvUSTCiJ QLVkadr99cg585u6vF/hwQhznGprPM4020TAQ= Received: by 10.141.75.17 with SMTP id c17mr8641573rvl.212.1214021885906; Fri, 20 Jun 2008 21:18:05 -0700 (PDT) Received: by 10.150.145.16 with HTTP; Fri, 20 Jun 2008 21:18:05 -0700 (PDT) Message-ID: <1c23473f0806202118j1a5753f4se7bc2e8e39cc15f0@mail.gmail.com> Date: Fri, 20 Jun 2008 21:18:05 -0700 From: "David Leonard" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: Another Turbo Bites the dust In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_16290_30435413.1214021885886" References: ------=_Part_16290_30435413.1214021885886 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline yup on both counts. Dave On Fri, Jun 20, 2008 at 9:14 PM, Mike Wills wrote: > 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 ----- > *From:* David Leonard > *To:* Rotary motors in aircraft > *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. > > -- > David Leonard > > Turbo Rotary RV-6 N4VY > http://N4VY.RotaryRoster.net > http://RotaryRoster.net > > -- David Leonard Turbo Rotary RV-6 N4VY http://N4VY.RotaryRoster.net http://RotaryRoster.net ------=_Part_16290_30435413.1214021885886 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline yup on both counts.

Dave

On Fri, Jun 20, 2008 at 9:14 PM, Mike Wills <rv-4mike@cox.net> wrote:
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 -----
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.

--
David Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net



--
David Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net ------=_Part_16290_30435413.1214021885886--