X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.102] (HELO ms-smtp-03-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 5.0.8) with ESMTP id 1036055 for flyrotary@lancaironline.net; Thu, 16 Mar 2006 09:18:26 -0500 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.102; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-025-165.carolina.res.rr.com [24.74.25.165]) by ms-smtp-03-eri0.southeast.rr.com (8.13.4/8.13.4) with SMTP id k2GEHdjp002071 for ; Thu, 16 Mar 2006 09:17:40 -0500 (EST) Message-ID: <000701c64904$6694ea50$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Motor teardown results Date: Thu, 16 Mar 2006 09:17:47 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0004_01C648DA.7D750810" 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_0004_01C648DA.7D750810 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageRusty, My rotor housings did have chatter marks - although they = did not appear as severe as the ones looked in Chuck's photos. My = housings on the other hand were the ones that came with the core engine = - pre-owned or used in other words. However, I did check them out = pretty carefully and am certain I would have noticed any chatter marks. = Wish I had know about the slot wear specs and had checked the used = rotors as carefully. Probably several things contributed - none of which by themselves would = cause the problem, but have two or three occur and "Pow"!. Ed ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Thursday, March 16, 2006 9:10 AM Subject: [FlyRotary] Re: Motor teardown results 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? 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 It will be interesting to see if your apex seal grooves are worn as Ed = mentioned. Ed, was your housing full of chatter marks? Cheers, Rusty=20 PS- Hoser from the urban dictionary for George (not translated into = any dialect) http://www.urbandictionary.com/define.php?term=3Dhoser ------=_NextPart_000_0004_01C648DA.7D750810 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Rusty, My rotor housings did have chatter marks = - although=20 they did not appear as severe as the ones looked in Chuck's = photos.  My=20 housings on the other hand were the ones that came with the core engine = -=20 pre-owned or used in other words.  However, I did check them = out=20 pretty carefully and am certain I would have noticed any chatter = marks. =20 Wish I had know about the slot wear specs and had checked the used = rotors as=20 carefully.
 
Probably several things contributed - none of = which by=20 themselves would cause the problem, but have two or three occur and=20 "Pow"!.
 
Ed
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Thursday, March 16, 2006 = 9:10=20 AM
Subject: [FlyRotary] Re: Motor = teardown=20 results

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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