X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.100] (HELO ms-smtp-01-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 912696 for flyrotary@lancaironline.net; Sat, 23 Apr 2005 21:08:05 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.100; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-185-127.carolina.res.rr.com [24.74.185.127]) by ms-smtp-01-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j3O17GLw027685 for ; Sat, 23 Apr 2005 21:07:18 -0400 (EDT) Message-ID: <000601c54869$faa41370$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" Subject: Attn: Finn -Shattered Apex seal Was "V" Groove Date: Sat, 23 Apr 2005 21:07:25 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0003_01C54848.7330A460" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0003_01C54848.7330A460 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Finn, regarding the possibility of the apex seal simply shattering = rather than FOD. I also found in the overhaul supplemental instructions = about the parts in the basic overhaul kit this sentence from Bruce: ".... The apex seal will rock in their grooves, wearing the groove to a = V and eventually shatter due to the excessive clearance...." Sooooo, I am more convinced than ever that I did not encounter a = necessarily rare condition - that excessive seal clearance and shatter = seals do happen. Does not take a foreign object. I strongly suspect = that there are probably several conditions that play a role in when the = seal shatters (if ever) and if they all play the wrong way at the same = time, the seal shatters sooner. On the otherhand, the engine might = possibly wear out before the seal shatters if those factors never = converge. Ed Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com ------=_NextPart_000_0003_01C54848.7330A460 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Finn, regarding the possibility of the = apex seal=20 simply shattering rather than FOD.  I also found in the overhaul=20 supplemental instructions about the parts in the basic overhaul kit this = sentence from Bruce:
 
".... The apex seal will rock in their = grooves,=20 wearing the groove to a V and eventually shatter due to the excessive=20 clearance...."
 
Sooooo, I am more convinced than ever = that I did=20 not encounter a necessarily rare condition - that excessive seal = clearance and=20 shatter seals do happen.  Does not take a foreign object.  I = strongly=20 suspect that there are probably several conditions that play a role in = when the=20 seal shatters (if ever) and if they all play the wrong way at the same = time, the=20 seal shatters sooner.  On the otherhand, the engine might possibly = wear out=20 before the seal shatters if those factors never converge.
 
 
Ed
 
Ed Anderson
Rv-6A N494BW Rotary=20 Powered
Matthews, NC
eanderson@carolina.rr.com
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