X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from elasmtp-dupuy.atl.sa.earthlink.net ([209.86.89.62] verified) by logan.com (CommuniGate Pro SMTP 6.0.5) with ESMTP id 6391170 for lml@lancaironline.net; Thu, 25 Jul 2013 16:56:01 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.62; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=lMPI1LecVTLdI5GfTlPL8gj1Lph42T9Qvv1Wz7AdfaOcjOcO8O2NtiSuOSb7Y8Ki; h=Received:References:In-Reply-To:Mime-Version:Content-Type:Message-Id:Content-Transfer-Encoding:X-Mailer:From:Subject:Date:To:X-ELNK-Trace:X-Originating-IP; Received: from [198.228.193.170] (helo=[10.77.98.93]) by elasmtp-dupuy.atl.sa.earthlink.net with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.67) (envelope-from ) id 1V2SZJ-0005NY-JK; Thu, 25 Jul 2013 16:55:26 -0400 References: In-Reply-To: Mime-Version: 1.0 (1.0) Content-Type: multipart/alternative; boundary=Apple-Mail-D1019A68-5F06-46F2-8526-D05506B26995 Message-Id: Content-Transfer-Encoding: 7bit X-Mailer: iPhone Mail (10A523) From: Colyn Case Subject: Re: [LML] Re: Potential Problem-Engine Vibration Date: Thu, 25 Jul 2013 16:55:22 -0400 To: Lancair Mailing List X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da940ea2a8fc4d7ebff4a5718dd241a458acc350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 198.228.193.170 --Apple-Mail-D1019A68-5F06-46F2-8526-D05506B26995 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Doug, there was an earlier scimitar. Just want to verify you are talking= the same part number. Colyn=20 Sent from my iPhone On Jul 25, 2013, at 4:44 PM, Douglas Johnson wrote:= > My 550/hartzell scimitar is and has always been smooth. > 1350hrs TT >=20 > Douglas Johnson MD > Sent from my iPad >=20 > On Jul 25, 2013, at 12:10 PM, Bob Rickard wrote:= >=20 >>=20 >> The key point that this thread is about is a vibration that is NOT "norma= l". The key indicator is a change in the magnitude of the vibration with a c= hange in RPM. There are enough of you out there that have responded to me d= irectly that state you have made all attempts at correcting the "normal" vib= ration issues, ruling out alternators, cowl interference, motor mounts, dyna= mic balancing, crank counter weights, etc. Those things are normal and woul= d not likely cause damage to the crank prop flange if left untreated. The p= roblem we are discussing is related to the prop/engine combination. =20 >>=20 >> We have confirmed reports of 550 motors being smooth with McCauley props,= Aerocomposite Props and MT props, to answer Charley's question below. Howe= ver, NO ONE has come forward and said "My 550 engine/Hartzell Scimitar 78" p= rop combination is smooth". I would be very interested if someone out there= can say that. To the contrary, I have received multiple responses from 4 d= ifferent aircraft types that say "I have dealt with this for a long time and= can't fix it". Now what? >>=20 >> Bob R >>=20 >>=20 >>=20 >> On Jul 25, 2013, at 9:21 AM, Paul Miller wrote: >>=20 >>> Ed Martin's legacy is smooth. Mine has had a lot of annoying vibes as y= ou describe but virtually all have been removed with lots of cowling interfe= rence fixes and plug change. Many pilots forget the alternator can be a wic= ked source of vibration and it is almost in the same plane as the prop. >>>=20 >>> The problems I had originally were in that freq range and visible at the= wingtip also. >>>=20 >>> Paul >>>=20 >>> On 2013-07-25, at 9:54, Charles Brown wrote: >>>=20 >>>>=20 >>>> Has anyone definitely flown a vibration-free IO-550 Lancair (or TSIO-55= 0) with *any* propeller? And by vibration-free, I mean it is free of low-fr= equency 10-20Hz stuff, not the normal noise of flying. What I'm wondering i= s... is it the 550, making such vibration with *any* propeller? >>>>=20 >>>> Charley Brown >>>> Legacy RG 280hr >>>=20 >>> -- >>> For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.h= tml >>=20 >> >>=20 >> Bob Rickard >> President, Rickard Consulting Group, Inc. >> r.rickard@rcginc-us.com >>=20 >>=20 >>=20 --Apple-Mail-D1019A68-5F06-46F2-8526-D05506B26995 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Doug,  there was an earlier scimi= tar.    Just want to verify you are talking the same part number. &= nbsp;  Colyn 

Sent from my iPhone

On Jul 25, 2= 013, at 4:44 PM, Douglas Johnson <lancair1@bellsouth.net> wrote:

My 550/hartzell scimitar is and has always been smooth.
1350hrs TT

Douglas Johnson MD
Sent from my iPad
=
On Jul 25, 2013, at 12:10 PM, Bob Rickard <r.rickard@rcginc-us.com> wrote:


The key point that this thread is= about is a vibration that is NOT "normal".  The key indicator is a cha= nge in the magnitude of the vibration with a change in RPM.  There are e= nough of you out there that have responded to me directly that state you hav= e made all attempts at correcting the "normal" vibration issues, ruling out a= lternators, cowl interference, motor mounts, dynamic balancing, crank counte= r weights, etc.  Those things are normal and would not likely cause dam= age to the crank prop flange if left untreated.  The problem we are dis= cussing is related to the prop/engine combination.  

We have confirmed reports of 550 motors being smooth with McCauley pr= ops, Aerocomposite Props and MT props, to answer Charley's question below. &= nbsp;However, NO ONE has come forward and said "My 550 engine/Hartzell Scimi= tar 78" prop combination is smooth".  I would be very interested if som= eone out there can say that.  To the contrary, I have received multiple= responses from 4 different aircraft types that say "I have dealt with this f= or a long time and can't fix it".  Now what?

B= ob R



On Jul 25, 2= 013, at 9:21 AM, Paul Miller <pjdm= iller@gmail.com> wrote:

=
Ed Martin's legacy is smooth.  Mine has had a= lot of annoying vibes as you describe but virtually all have been removed w= ith lots of cowling interference fixes and plug change.  Many pilots fo= rget the alternator can be a wicked source of vibration and it is almost in t= he same plane as the prop.

The problems I had originally were in that= freq range and visible at the wingtip also.

Paul

On 2013-07-2= 5, at 9:54, Charles Brown <brownc= c1@verizon.net> wrote:


Has anyon= e definitely flown a vibration-free IO-550 Lancair (or TSIO-550) with *any* p= ropeller?  And by vibration-free, I mean it is free of low-frequency 10= -20Hz stuff, not the normal noise of flying.  What I'm wondering is... &= nbsp;is it the 550, making such vibration with *any* propeller?

Charl= ey Brown
Legacy RG  280hr



--
For arch= ives and unsub http://mail.lancaironline.net:81/lists/lml/List.html

<RCG Logo for Email.jpg>

Bob Rickard
President, Rickard Consulti= ng Group, Inc.


=

= --Apple-Mail-D1019A68-5F06-46F2-8526-D05506B26995--