X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 15 Nov 2008 07:36:20 -0500 Message-ID: X-Original-Return-Path: Received: from mx1.lsn.net ([66.90.130.73] verified) by logan.com (CommuniGate Pro SMTP 5.2.10) with ESMTP id 3301051 for lml@lancaironline.net; Fri, 14 Nov 2008 21:28:53 -0500 Received-SPF: pass receiver=logan.com; client-ip=66.90.130.73; envelope-from=mmcmanus@grandecom.net Received: from sm-cflow1.lsn.net (sm-cflow1.lsn.net [66.90.138.152]) by mx1.lsn.net (8.13.5/8.13.5) with ESMTP id mAF2SB7V002181 for ; Fri, 14 Nov 2008 20:28:11 -0600 Received: from l98upwp2.hewitt.com (l98upwp2.hewitt.com [204.152.235.216]) by webmail.grandecom.net (IMP) with HTTP for ; Fri, 14 Nov 2008 20:28:17 -0600 X-Original-Message-ID: <1226716097.491e33c1784ef@webmail.grandecom.net> X-Original-Date: Fri, 14 Nov 2008 20:28:17 -0600 From: mmcmanus@grandecom.net X-Original-To: Lancair Mailing List Subject: Prop Length for 360 MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit User-Agent: Internet Messaging Program (IMP) 3.2.3 X-Originating-IP: 204.152.235.216 X-Virus-Scanned: ClamAV 0.94.1-broken-compiler/8635/Fri Nov 14 14:56:16 2008 on mx0.lsn.net X-Virus-Status: Clean I'm in the middle of getting my Hartzell 2 blade prop overhauled for my Lancair 360. I got a new hub at 50% discount from Hartzell to eliminate the recurring eddy current inspection. The prop shop doing the overhaul has issues with the blades and they will not issue the formal 8131 (I think) paperwork for the overhaul. The problem is the blade length. I bought the airplane 3 years ago and it had an overhauled "0" time prop when the airplane was built in 2002. The blades are 70" long according to the prop shop. They also say that the Hartzell recommends a 72" blade. But Hartzell also allows a 68" blade for the Lyc 360. They do not however, recommend a 70" blade. The question is, since I've had no problems or vibration issues with my 70" blades - should I be concerned? I guess Hartzell's recommendation is based on some harmonic resonance or some other vibration related things (which are outside my knowledge). Does my 70" blade length provide cruise or climb capabilities that are greater or lesser than a 68" prop. I'm planning to have the 70" blades reinstalled on the new hub, and the log entry will just say the standard overhaul stuff (except the IAW stuff), and it will specify "experimental A/C usage only." Any thoughts? Thanks, Matt McManus lnc2 360 408 hours total time airplane.