X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 15 Nov 2008 10:06:56 -0500 Message-ID: X-Original-Return-Path: Received: from [64.12.143.101] (HELO imo-m13.mail.aol.com) by logan.com (CommuniGate Pro SMTP 5.2.10) with ESMTP id 3301483 for lml@lancaironline.net; Sat, 15 Nov 2008 08:41:01 -0500 Received: from VTAILJEFF@aol.com by imo-m13.mx.aol.com (mail_out_v39.1.) id q.ce4.44646cfe (37062) for ; Sat, 15 Nov 2008 08:40:55 -0500 (EST) Received: from smtprly-db02.mx.aol.com (smtprly-db02.mx.aol.com [205.188.249.153]) by cia-db04.mx.aol.com (v121_r4.6) with ESMTP id MAILCIADB048-5c3a491ed165186; Sat, 15 Nov 2008 08:40:55 -0500 Received: from FWM-M09 (fwm-m09.webmail.aol.com [64.12.168.73]) by smtprly-db02.mx.aol.com (v121_r3.13) with ESMTP id MAILSMTPRLYDB028-5c3a491ed165186; Sat, 15 Nov 2008 08:40:53 -0500 References: X-Original-To: lml@lancaironline.net Subject: Re: [LML] Prop Length for 360 X-Original-Date: Sat, 15 Nov 2008 08:40:53 -0500 X-AOL-IP: 71.85.153.156 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: vtailjeff@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8CB153EEA2E9221_13E8_3B56_FWM-M09.sysops.aol.com" X-Mailer: AOL Webmail 39997-STANDARD Received: from 71.85.153.156 by FWM-M09.sysops.aol.com (64.12.168.73) with HTTP (WebMailUI); Sat, 15 Nov 2008 08:40:53 -0500 X-Original-Message-Id: <8CB153EE9E4A979-13E8-1D0F@FWM-M09.sysops.aol.com> X-Spam-Flag:NO ----------MB_8CB153EEA2E9221_13E8_3B56_FWM-M09.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii" Yes, you should be concerned. The propeller mfg and engine manufacutrer go to great lengths to assure the compatibility of prop/ engine combinations. The Lycoming 360 series (especially non counterweighted) and Hartzell props have a long history of prop tip and blade shank?failures due to harmonic issues. Best to study the issues by reading up on Hartzell service bulletins and AD's regarding these failures and their solutions. Your prop shop has your safety in mind. Jeff Edwards -----Original Message----- From: mmcmanus@grandecom.net To: lml@lancaironline.net Sent: Sat, 15 Nov 2008 6:36 am Subject: [LML] Prop Length for 360 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. -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html ----------MB_8CB153EEA2E9221_13E8_3B56_FWM-M09.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/html; charset="us-ascii" Yes, you should be concerned. The propeller mfg and engine manufacutrer go to great lengths to assure the compatibility of prop/ engine combinations. The Lycoming 360 series (especially non counterweighted) and Hartzell props have a long history of prop tip and blade shank failures due to harmonic issues. Best to study the issues by reading up on Hartzell service bulletins and AD's regarding these failures and their solutions. Your prop shop has your safety in mind.

Jeff Edwards

-----Original Message-----
From: mmcmanus@grandecom.net
To: lml@lancaironline.net
Sent: Sat, 15 Nov 2008 6:36 am
Subject: [LML] Prop Length for 360

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.




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