X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail04.syd.optusnet.com.au ([211.29.132.185] verified) by logan.com (CommuniGate Pro SMTP 5.2.3) with ESMTPS id 2978596 for flyrotary@lancaironline.net; Sat, 21 Jun 2008 18:24:18 -0400 Received-SPF: pass receiver=logan.com; client-ip=211.29.132.185; envelope-from=lendich@optusnet.com.au Received: from george (d58-104-215-70.dsl.nsw.optusnet.com.au [58.104.215.70]) by mail04.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id m5LMNVLv030651 for ; Sun, 22 Jun 2008 08:23:32 +1000 Message-ID: <006401c8d3ed$739b0bf0$6400a8c0@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Another Turbo Bites the dust Date: Sun, 22 Jun 2008 08:23:35 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0061_01C8D441.440C5200" 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 X-Antivirus: avast! (VPS 0657-0, 12/12/2006), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0061_01C8D441.440C5200 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable It's amazing how fast 130 hrs goes when you are having fun.:-) =20 I took off the exhaust today and too a look. One of the blades on the = turbine wheel is gone, but the axle seems otherwise intact, though it = may be off kilter and that is what is causing the resistance when I try = to turn it. So I am to sure if the problem was primarily the bearing, = or overheat, or overspeed. According to my calculations, turbine speed = should have been well within the green area. (way down around 60k RPM - = near the bottom of the chart.) One difference with this fligh... I usually run well lean of peak, = but this particular leg I was running a little late so I decided to push = it up a bit by running a best power setting. I figured I was OK because = I was high enough that I was only showing 21" MAP. But the failure = happened in descent when I kept best power as I came lower and the = engine RPM came up to about 6300 (more exhaust available). Combination of higher than normal EGT's and 'you number is up, = turbo'??? Dave Leonard Dave, I follow your threads carefully as you have put so much into the Turbo = installation, I don't know anyone who has done more but I'm sure there = are, it's just we/I am not aware of them. From what your saying, I think = your right on the money - heat is the killer (in this case). I personally would like you to try something remote as per suggestions = by others. I think Paul's idea is sound, but may be still to close to = the heat for my liking. George (down under) ------=_NextPart_000_0061_01C8D441.440C5200 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
It's amazing how fast 130 hrs goes when you are having = fun.:-) =20

I took off the exhaust today and too a look.  One of the = blades=20 on the turbine wheel is gone, but the axle seems otherwise intact, = though it=20 may be off kilter and that is what is causing the resistance when I = try to=20 turn it.  So I am to sure if the problem was primarily the = bearing, or=20 overheat, or overspeed.  According to my calculations, turbine = speed=20 should have been well within the green area. (way down around 60k RPM = - near=20 the bottom of the chart.)

One difference with this = fligh...  I=20 usually run well lean of peak, but this particular leg I was running a = little=20 late so I decided to push it up a bit by running a best power = setting.  I=20 figured I was OK because I was high enough that I was only showing 21" = MAP.  But the failure happened in descent when I kept best power = as I=20 came lower and the engine RPM came up to about 6300 (more exhaust=20 available).

Combination of higher than normal EGT's and 'you = number is=20 up, turbo'???

Dave Leonard
Dave,
I follow your threads carefully as = you have put=20 so much into the Turbo installation, I don't know anyone who has done = more but=20 I'm sure there are, it's just we/I am not aware of them. From what = your=20 saying, I think your right on the money - heat is the killer (in = this=20 case).
 
I personally would like you to try = something=20 remote as per suggestions by others. I think Paul's idea is sound, but = may be=20 still to close to the heat for my liking.
George (down under)
 
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