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Message-ID: <1c23473f0806202047t58f2d3b0t93bf15e9df8723e3@mail.gmail.com>
Date: Fri, 20 Jun 2008 20:47:20 -0700
From: "David Leonard" <wdleonard@gmail.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>, 
	"Rotary Engine" <rotaryeng@earthlink.net>
Subject: Another Turbo Bites the dust
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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

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Today I flew from San Diego to Brownville Texas to attend a formation flying clinic.&nbsp; After 6 hours of WOT flight I was descending through 5000&#39; (down from 15.5k) an just a few miles from the airport when I had a sudden and sickening drop in manifold pressure.&nbsp;&nbsp; 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.&nbsp; 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.&nbsp; I even continued on to a low pass for show rather than just landing.&nbsp; 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.<br>
<br>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.&nbsp; Will maybe be able to take a look in the hot side and see what I see.<br><br>This turbo was the TO4 hybrid with a fixed wide open waste gate.&nbsp; It had 130 hrs of mostly hard duty.&nbsp; Sigh.<br clear="all">
<br>-- <br>David Leonard<br><br>Turbo Rotary RV-6 N4VY<br><a href="http://N4VY.RotaryRoster.net">http://N4VY.RotaryRoster.net</a><br><a href="http://RotaryRoster.net">http://RotaryRoster.net</a>

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