X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 2 [X] Return-Path: Received: from ispmxmta06-srv.windstream.net ([166.102.165.167] verified) by logan.com (CommuniGate Pro SMTP 5.1.7) with ESMTP id 1907988 for flyrotary@lancaironline.net; Wed, 07 Mar 2007 18:21:50 -0500 Received-SPF: pass receiver=logan.com; client-ip=166.102.165.167; envelope-from=jskmberki@alltel.net Received: from ispmxaamta08-gx.windstream.net ([69.40.216.133]) by ispmxmta06-srv.windstream.net with ESMTP id <20070307232057.BGEJ5292.ispmxmta06-srv.windstream.net@ispmxaamta08-gx.windstream.net> for ; Wed, 7 Mar 2007 17:20:57 -0600 Received: from joehomepc ([69.40.216.133]) by ispmxaamta08-gx.windstream.net with SMTP id <20070307232057.XMGR1927.ispmxaamta08-gx.windstream.net@joehomepc> for ; Wed, 7 Mar 2007 17:20:57 -0600 Message-ID: <00df01c7610e$f243bb30$01fea8c0@joehomepc> From: "Joe Berki" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Worn rotor housings Date: Wed, 7 Mar 2007 18:18:41 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00DC_01C760E5.09138540" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1807 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1896 This is a multi-part message in MIME format. ------=_NextPart_000_00DC_01C760E5.09138540 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Appreciate the input. I do not think I will fly these housings but I = find it interesting to determine what is going on inside the motor per = the autopsy. I will take the worse one out of the 4 and try a P Port = modification. I was looking at Bruces criteria and noticed one of the = housings had the grooving on one end. While preparing some presentation = material for this week end I noticed that the way the apex seal is = designed that the little triangle on the corner could possibly cut that = groove. I probably will get new housings for flight. The end and = center housings might be re-used depending on how they measure for = flatness. i want to use the 89 rotors if they pass inspection. Joe Berki Limo EZ ----- Original Message -----=20 From: Ed Anderson=20 To: Rotary motors in aircraft=20 Sent: Wednesday, March 07, 2007 3:13 PM Subject: [FlyRotary] Re: Worn rotor housings I certainly agree with George. Being in the air is not place to have ..." I wish I had ..." thoughts. = My view is if there is any question or doubt as to its condition then I = replace it. Yes, I know used parts in many cases are more reliable than = new as they are past the infant mortality period. I do reuse parts. = The e shaft in my 91 block was also in 1986 block - still looks good as = new so I naturally reused it. I tried used rotors and in my case because I did not know to check the = critical apex seal slot wear ended up swallowing one and aborting a trip = to Sun & Fun. You need to know what is critical about a part and then = check that parameter as being comfortably within specifications. Also, what I might not even have a question about putting in a car - = will get rejected for airborne duty - 4F. Ed ----- Original Message -----=20 From: George Graham=20 To: Rotary motors in aircraft=20 Sent: Wednesday, March 07, 2007 3:01 PM Subject: [FlyRotary] Worn rotor housings My .02 Joe, My first teardown and rebuild 13b had rotor housings with some of = the steel plating missing along one edge. I took them around to every = "expert" that I could find, they all agreed that they were fine to use. = I then went ahead and assembled the motor, with new seals, gaskets etc. The motor ran great, like brand new I imagine. But, When it was time to install the motor into my airplane, I just = didn't feel good about those rotor housings, so I found another motor = that I've been flying since 1998. By peeking inside I knew that these = housings were pristine. I still have the first motor, but I doubt that I = will ever use it without another rebuild with new housings. Bert Rutan said something to the effect of "Do your very best, even = that will only be just barely good enough". I know, that sitting on the end of the runway, I must feel confident = that everything is as good as I can get it, in order to enjoy my flight. = Others will differ perhaps. George Graham Sarasota Florida Mazda RX7 EZ=20 -------------------------------------------------------------------------= --- Never miss an email again! Yahoo! Toolbar alerts you the instant new Mail arrives. Check it = out. -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 268.18.7/713 - Release Date: = 3/7/2007 9:24 AM ------=_NextPart_000_00DC_01C760E5.09138540 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Appreciate the input.  I do not = think I will=20 fly these housings but I find it interesting to determine what is going = on=20 inside the motor per the autopsy.  I will take the worse one out of = the 4=20 and try a P Port modification. I was looking at Bruces criteria and = noticed one=20 of the housings had the grooving on one end.  While preparing some=20 presentation material for this week end I noticed that the way the apex = seal is=20 designed that the little triangle on the corner could possibly cut that=20 groove.  I probably will get new housings for flight.  The end = and=20 center housings might be re-used depending on how they measure for=20 flatness.  i want to use the 89 rotors if they pass=20 inspection.
 
Joe Berki
Limo EZ
----- Original Message -----
From:=20 Ed=20 Anderson
Sent: Wednesday, March 07, 2007 = 3:13=20 PM
Subject: [FlyRotary] Re: Worn = rotor=20 housings

I certainly agree = with George.
 
Being in the air is not place to have ..." I = wish I had=20 ..." thoughts.  My view is if there is any question or doubt as = to its=20 condition then I replace it.  Yes, I know used parts in many = cases are=20 more reliable than new as they are past the infant mortality = period.  I=20 do reuse parts.  The e shaft in my 91 block was also in 1986 = block -=20 still looks good as new so I naturally reused it.
 
I tried used rotors and in my case because I = did not=20 know to check the critical apex seal slot wear ended up swallowing one = and=20 aborting a trip to Sun & Fun.  You need to know what is = critical=20 about a part and then check that parameter as being comfortably within = specifications.
 
Also, what I might not even have a question = about=20 putting in  a car - will get rejected for airborne duty -=20 4F.
 
 
 
Ed
----- Original Message -----
From:=20 George = Graham=20
To: Rotary motors in = aircraft=20
Sent: Wednesday, March 07, = 2007 3:01=20 PM
Subject: [FlyRotary] Worn = rotor=20 housings

My .02 Joe,

   My first teardown and = rebuild=20 13b had rotor housings with some of the steel plating missing along = one=20 edge. I took them around to every "expert" that I could find, they = all=20 agreed that they were fine to use.  I then went ahead and = assembled the=20 motor, with new seals, gaskets etc.
The motor ran great, like = brand new I=20 imagine.

But, When it was time to install the motor into my = airplane,=20 I just didn't feel good about those rotor housings, so I found = another motor=20 that I've been flying since 1998.  By peeking inside I knew = that these=20 housings were pristine. I still have the first motor, but I doubt = that I=20 will ever use it without another rebuild with new = housings.

Bert=20 Rutan said something to the effect of "Do your very best, even that = will=20 only be just barely good enough".

I know, that sitting on the = end of=20 the runway, I must feel confident that everything is as good as I = can get=20 it, in order to enjoy my flight. Others will differ=20 perhaps.


George Graham
Sarasota Florida
Mazda RX7 = EZ=20

Never=20 miss an email again!
Yahoo! Toolbar alerts you the instant = new Mail=20 arrives.=20 Check it out.

No virus found in this incoming message.
Checked by AVG Free = Edition.
Version: 7.5.446 / Virus Database: 268.18.7/713 - Release = Date:=20 3/7/2007 9:24 AM
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