X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao103.cox.net ([68.230.241.43] verified) by logan.com (CommuniGate Pro SMTP 5.3.4) with ESMTP id 4180825 for flyrotary@lancaironline.net; Sat, 27 Mar 2010 11:27:51 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.43; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao103.cox.net (InterMail vM.8.00.01.00 201-2244-105-20090324) with ESMTP id <20100327152716.XYTC22711.fed1rmmtao103.cox.net@fed1rmimpo02.cox.net> for ; Sat, 27 Mar 2010 11:27:16 -0400 Received: from BigAl ([72.192.128.205]) by fed1rmimpo02.cox.net with bizsmtp id yFTF1d0074S1t5C04FTFlV; Sat, 27 Mar 2010 11:27:15 -0400 X-VR-Score: 0.00 X-Authority-Analysis: v=1.1 cv=KqzZVGv1/pIBe+XbL3gCBfL8vaFXECOST7Bs1vfp5Gs= c=1 sm=1 a=XbAoGkqbTjAA:10 a=Vegc0WxVmH5BHtpNDyThtA==:17 a=ElzsW8HUznaqigw7YmEA:9 a=wtsbGOle9YF8reBSmFYA:7 a=xwhr_fPlQHKoTl46n93AQ00bEU4A:4 a=CjuIK1q_8ugA:10 a=ZDe4ZUYZMgxKyje5g1YA:9 a=Abh0wz_mlPL0Dsr2Bk8A:7 a=n3K8tM-YqC6M6nl5n75l3EQJA7EA:4 a=Vegc0WxVmH5BHtpNDyThtA==:117 X-CM-Score: 0.00 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Adaptor plate rivets - Al' 20B Date: Sat, 27 Mar 2010 08:27:07 -0800 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0000_01CACD87.49EBF540" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6856 Importance: Normal Thread-Index: AcrNqIAMvAYp6s2gToW3QIQOaa0OdAAIUBQg In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_0000_01CACD87.49EBF540 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I saw the 'set' on the rubber dampers long ago (after about 150 total hours) and started checking it at intervals from 100 to 300 hours. The = set did not change significantly so in my opinion the dampers only need to = be replaced if the rubber material itself is starting to deteriorate. Mine haven't after 1200+ hours. The set will be noticeable after very few = hours so replacing them at that point would get old in a hurry. I was concerned about some change of properties of the elastomer; like 'hardening' with age and heat. Checking them further, they seem OK. I'm thinking I'll rotate them 180 like the A&Ps do with the engine mount elastomers on the certified craft. Make sense? Al =20 ------=_NextPart_000_0000_01CACD87.49EBF540 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable


 I saw the 'set' on the rubber dampers long ago (after about 150 = total hours) and started checking it at intervals from 100 to 300 = hours.   The set did not change significantly so in my opinion the dampers only = need to be replaced if the rubber material itself is starting to = deteriorate.  Mine haven't after 1200+ hours.   The set will be noticeable = after very few hours so replacing them at that point would get old in a = hurry.

I was concerned about some change of properties of the elastomer; like = ‘hardening’ with age and heat. Checking them further, they seem OK. I’m = thinking I’ll rotate them 180 like the A&Ps do with the engine mount elastomers on = the certified craft. Make sense?

Al

 

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