X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mx2.netapp.com ([216.240.18.37] verified) by logan.com (CommuniGate Pro SMTP 5.3c3) with ESMTPS id 3990663 for flyrotary@lancaironline.net; Wed, 25 Nov 2009 10:06:09 -0500 Received-SPF: softfail receiver=logan.com; client-ip=216.240.18.37; envelope-from=echristley@nc.rr.com X-IronPort-AV: E=Sophos;i="4.47,286,1257148800"; d="scan'208";a="279896810" Received: from smtp1.corp.netapp.com ([10.57.156.124]) by mx2-out.netapp.com with ESMTP; 25 Nov 2009 07:05:18 -0800 Received: from [10.62.16.52] (vinod-lx.hq.netapp.com [10.62.16.52] (may be forged)) by smtp1.corp.netapp.com (8.13.1/8.13.1/NTAP-1.6) with ESMTP id nAPF5Grp016672 for ; Wed, 25 Nov 2009 07:05:17 -0800 (PST) Message-ID: <4B0D47AC.7040806@nc.rr.com> Date: Wed, 25 Nov 2009 10:05:16 -0500 From: Ernest Christley Reply-To: echristley@nc.rr.com User-Agent: Thunderbird 2.0.0.22 (X11/20090608) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: No start References: In-Reply-To: Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Dave wrote: > > Or the pan bolts that run through and are coated with paint, sealant, > contacting an anodized plate, etc... An anodized plate is probably a bad idea. Anodizing oxidizes the surface layer of the aluminum, converting it to a brittle ceramic. The unavoidable vibrations in the base material will create microscopic cracks that creates stress risers that can then propagate. I was skeptical when I first heard this, but then was presented with evidence that demonstrated a 20% decrease in reliability with anodized aluminum components. I had my bed plate, PSRU mount plate and several other components nickel plated. As a bonus, the bright nickel finish looks like chrome. 8*)