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X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from S4.cableone.net ([24.116.0.230] verified) by logan.com (CommuniGate Pro SMTP 5.0.8) with ESMTP id 1036998 for flyrotary@lancaironline.net; Fri, 17 Mar 2006 00:29:25 -0500 Received-SPF: pass receiver=logan.com; client-ip=24.116.0.230; envelope-from=crayd@cableone.net Received: from chuckathlon (unverified [69.92.218.28]) by S4.cableone.net (CableOne SMTP Service S4) with ESMTP id 49749111 for ; Thu, 16 Mar 2006 23:07:21 -0700 Return-Path: From: "Chuck Dunlap" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Motor teardown results Date: Thu, 16 Mar 2006 22:30:17 -0700 Message-ID: <00e801c64983$e05ccf40$6501a8c0@chuckathlon> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00E9_01C64949.33FDF740" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.3416 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2727.1300 In-Reply-To: Importance: Normal X-SpamDetect: ***: 3.200000 Possible url forgery/scam=2.0,Suspicious tags-to-text ratio=1.2 X-UrlForgery: (http://www.urbandictionary.com) (http://ww) X-NotAscii: charset=us-ascii X-IP-stats: Incoming Last 0, First 33, in=11, out=0, spam=0 X-External-IP: 69.92.218.28 X-Abuse-Info: Send abuse complaints to abuse@cableone.net This is a multi-part message in MIME format. ------=_NextPart_000_00E9_01C64949.33FDF740 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable =20 T he best I can tell from my records, I bought in on a group buy of 2 pc Hurley seals sometime in mid 2002, they came with new springs. Then after my Grand Canyon incident, I replaced one rotor and bought one set of 3 seals from Mazdatrix MTX112N326 I cannot tell which seal was in this failed rotor, but they both show the chatter marks. =20 Oops, I see I am top posting after your bottom post, Rusty :-) Sorry =20 Chuck=20 I now have Tracy's 2 piece apex seals and I wonder how they will perform, it appears that the heavier weight of the 2 piece seals puts the resonant frequency in the cruising range of 6000RPM? =20 =20 Interesting report Chuck. I would think any sort of rotor bouncing would be more of a spring problem than a seal problem. What springs are you using for the apex seals? Were they new, proper amount of curvature, big and small spring for each seal? Just seems odd that no one else has been seeing these chatter marks like you have. =20 =20 It will be interesting to see if your apex seal grooves are worn as Ed mentioned. Ed, was your housing full of chatter marks? =20 Cheers, Rusty=20 =20 =20 PS- Hoser from the urban dictionary for George (not translated into any dialect) http://www.urbandictionary.com/define.php?term=3Dhoser =20 =20 ------=_NextPart_000_00E9_01C64949.33FDF740 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message

T he = best I can=20 tell from my records, I bought in on a group buy of 2 pc Hurley = seals=20 sometime in mid 2002, they came with new springs. Then after my Grand = Canyon=20 incident, I replaced one rotor and bought one set of 3 seals from = Mazdatrix MTX112N326

I cannot tell = which seal=20 was in this failed rotor, but they both show the chatter=20 marks.

Oops, I see I am top posting = after your bottom=20 post, Rusty :-)

Sorry

Chuck

I = now have Tracy's=20 2 piece apex seals and I wonder how they will perform, it appears that = the=20 heavier weight of the 2 piece seals puts the resonant frequency in the = cruising range of 6000RPM?

Interesting report Chuck. I would = think any=20 sort of rotor bouncing would be more of a spring problem = than a seal=20 problem. What springs are you using for the apex = seals? =20 Were they new, proper amount of curvature, big and small spring = for each=20 seal? Just seems odd that no one else has been seeing these = chatter=20 marks like you have.

It will be interesting to see if your apex = seal=20 grooves are worn as Ed mentioned. Ed, was your housing full of = chatter=20 marks?

Cheers,

Rusty

PS- Hoser from the urban dictionary for = George (not=20 translated into any dialect)

http://ww= w.urbandictionary.com/define.php?term=3Dhoser

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