X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf20aec.mail.bellsouth.net ([205.152.59.68] verified) by logan.com (CommuniGate Pro SMTP 5.0.8) with ESMTP id 990560 for flyrotary@lancaironline.net; Sat, 18 Feb 2006 20:27:33 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.68; envelope-from=atlasyts@bellsouth.net Received: from ibm64aec.bellsouth.net ([70.149.0.133]) by imf20aec.mail.bellsouth.net with ESMTP id <20060219012650.QGRE18213.imf20aec.mail.bellsouth.net@ibm64aec.bellsouth.net> for ; Sat, 18 Feb 2006 20:26:50 -0500 Received: from [192.168.0.100] (really [70.149.0.133]) by ibm64aec.bellsouth.net with ESMTP id <20060219012649.EUUZ2425.ibm64aec.bellsouth.net@[192.168.0.100]> for ; Sat, 18 Feb 2006 20:26:49 -0500 Mime-Version: 1.0 (Apple Message framework v746.2) In-Reply-To: References: Content-Type: multipart/alternative; boundary=Apple-Mail-2-943972674 Message-Id: <026291F6-32BB-4641-9909-70680F86F54C@bellsouth.net> From: Bulent Aliev Subject: Re: [FlyRotary] Re: Another Turbo? Date: Sat, 18 Feb 2006 20:27:26 -0500 To: "Rotary motors in aircraft" X-Mailer: Apple Mail (2.746.2) --Apple-Mail-2-943972674 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed On Feb 18, 2006, at 1:56 PM, Russell Duffy wrote: > The second turbo sent turbine fragments back into the exhaust port > and took out an apex seal. > This cost me a housing, a set of seals and a drive to North Carolina. > > Hi John, > > How confident are you in this diagnosis? Did you actually find > pieces of turbine blade imbedded in the housing? Did Bruce says > he's seen this plenty of times before? > > I've got to admit that I have a hard time believing this could > happen. As Ed said, they're spinning fast, but the energy will be > mostly centrifugal force, with some forward momentum thrown in. > When you think of the angle that the exhaust hits the turbine, it > just seems really unlikely this could happen. > > I've always wondered if that failure didn't happen just the > opposite. If detonation broke an apex seal, it would go into the > turbine. This in fact happens all the time on the cars. > > Good luck with your new turbo. > > Rusty (new kits are soooooo nice) I agree with Rusty 100%. There is no way in hell a piece will go thru the passages back into the exhaust ports. #1 the gasses come at the velocity of a rifle shot #2 I have old (John's) turbo casting and know what the gas passages look like. I would go with fractured apex, or blown corner seal. BTW John did not find any corner seals left when Bruce opened the engine Buly --Apple-Mail-2-943972674 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1

=

On Feb 18, 2006, at 1:56 PM, Russell Duffy = wrote:

The second turbo sent = turbine fragments back into the exhaust port and took out an apex = seal.
This cost me a = housing, a set of seals and a drive to North Carolina.=A0
=A0
=
Hi = John,
=A0
=
How confident are you in this diagnosis?=A0 = Did you actually find pieces of turbine blade imbedded in the = housing?=A0=A0Did Bruce says he's seen this plenty of times = before?=A0=A0
=A0
=
I've got to admit that I have a hard time = believing=A0this could happen.=A0 As Ed said, they're spinning fast,=A0but= the energy=A0will be mostly=A0centrifugal force, with some forward = momentum thrown in.=A0 When you think of=A0the angle that the exhaust = hits the=A0turbine,=A0it just seems really unlikely this could happen.=A0 =
=A0
I've always wondered if that failure didn't happen just the = opposite.=A0 If=A0detonation broke an apex seal, it would go into the = turbine.=A0 This in fact happens all the time on the = cars.=A0=A0
=A0
=
Good luck with your new = turbo.=A0=A0
=A0
=
Rusty (new kits are soooooo = nice)=A0=A0
I agree with Rusty 100%. There is no way in hell a piece will go = thru the passages back into the exhaust ports.
#1 the gasses = come at the velocity of a rifle shot
#2 I have old (John's) = turbo casting and know what the gas passages look like. I would go with = fractured apex, or blown corner seal. BTW John did not find any corner = seals left when Bruce opened the = engine
Buly
= --Apple-Mail-2-943972674--