Return-Path: Received: from [24.25.9.101] (HELO ms-smtp-02-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2b7) with ESMTP id 310772 for flyrotary@lancaironline.net; Sat, 10 Jul 2004 17:56:02 -0400 Received: from EDWARD (clt25-78-058.carolina.rr.com [24.25.78.58]) by ms-smtp-02-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i6ALsUNs010802 for ; Sat, 10 Jul 2004 17:54:31 -0400 (EDT) Message-ID: <002601c466c8$7d688270$2402a8c0@EDWARD> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Three candidates for Turbo Failure Date: Sat, 10 Jul 2004 17:54:35 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0023_01C466A6.F62746F0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0023_01C466A6.F62746F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dave, According to the turbo books, friction welding has long been the = method by which the turbine wheel is affixed to the shaft. As I = understand it they take a turbine wheel and place it in a fixture and = spin it (or maybe its the shaft they spin - I forget). But, in any case = when it reaches some magic rpm they forcefully press the wheel against = the shaft (one or the other is stationary). The resulting heat from the = friction causes the metal to melt and fuse welding the two parts = together. Hence the name friction welding. . At least that is my understanding of it. Ed Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ----- Original Message -----=20 From: Dale Rogers=20 To: Rotary motors in aircraft=20 Sent: Saturday, July 10, 2004 5:45 PM Subject: [FlyRotary] Re: Three candidates for Turbo Failure =20 My somewhat semi-random thoughts ... Dale R. COZY MkIV-R13B-NA #1254 -------------------------------------------------------------------------= ----- >loose compressor wheels=20 I'm afraid incorrect terminology may have sent you off in the wrong = direction. It's the turbine wheel that failed, not the compressor wheel. = On each occasion the weld broke right at the base of the turbine wheel, = the wheel came off and blocked the exhaust outlet. Thanks for all the brain work. Very interesting stuff. Regards, john -------------------------------------------------------------------------= ----- >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_0023_01C466A6.F62746F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Dave,

According to the = turbo books,=20 friction welding has long been the method by which the turbine wheel is = affixed=20 to the shaft. As I understand it they take a turbine wheel and = place it in=20 a fixture and spin it (or maybe its the shaft they spin - I = forget). =20 But, in any case when it reaches some magic rpm they forcefully press = the wheel=20 against the shaft (one or the other is stationary). The resulting = heat=20 from the friction causes the metal to melt and fuse welding the two = parts=20 together. Hence the name friction welding.

. At least that is my = understanding of=20 it.

Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC

----- Original Message -----

From:=20 Dale = Rogers=20

To: Rotary motors in = aircraft

Sent: Saturday, July 10, 2004 = 5:45=20 PM

Subject: [FlyRotary] Re: Three = candidates=20 for Turbo Failure

My somewhat semi-random thoughts = ...

Dale=20 R.
COZY MkIV-R13B-NA #1254

>loose compressor wheels=20

I'm = afraid=20 incorrect terminology may have sent you off in the wrong direction. = It's the=20 turbine wheel that failed, not the compressor wheel. On each occasion = the weld=20 broke right at the base of the turbine wheel, the wheel came off = and=20 blocked the exhaust outlet.

Thanks for all the=20 brain work. Very interesting stuff.

Regards,

john

>> Homepage: =20 http://www.flyrotary.com/
>> Archive: =20 = http://lancaironline.net/lists/flyrotary/List.html
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