X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 25 Jul 2013 20:46:43 -0400 Message-ID: X-Original-Return-Path: Received: from [208.113.200.5] (HELO homiemail-a81.g.dreamhost.com) by logan.com (CommuniGate Pro SMTP 6.0.5) with ESMTP id 6391169 for lml@lancaironline.net; Thu, 25 Jul 2013 16:53:55 -0400 Received-SPF: none receiver=logan.com; client-ip=208.113.200.5; envelope-from=r.rickard@rcginc-us.com Received: from homiemail-a81.g.dreamhost.com (localhost [127.0.0.1]) by homiemail-a81.g.dreamhost.com (Postfix) with ESMTP id 5C2EDA806F for ; Thu, 25 Jul 2013 13:53:20 -0700 (PDT) Received: from [192.168.1.104] (24-107-103-44.dhcp.stls.mo.charter.com [24.107.103.44]) (Authenticated sender: r.rickard@rcginc-us.com) by homiemail-a81.g.dreamhost.com (Postfix) with ESMTPA id 1CF66A806C for ; Thu, 25 Jul 2013 13:53:20 -0700 (PDT) Subject: Re: [LML] Re: Potential Problem-Engine Vibration References: From: Bob Rickard Content-Type: multipart/alternative; boundary=Apple-Mail-46DDB7DD-DF14-4507-92C2-3B5996032807 X-Mailer: iPad Mail (10B329) In-Reply-To: X-Original-Message-Id: <41FDF617-2296-4BCC-8395-27E2C86A1C39@rcginc-us.com> X-Original-Date: Thu, 25 Jul 2013 15:53:19 -0500 X-Original-To: Lancair Mailing List Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) --Apple-Mail-46DDB7DD-DF14-4507-92C2-3B5996032807 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable I am pretty sure mine is a 78" prop. See Lancair site http://www.lancair.com/index.php/our-aircraft/es-esp/options=20 All Hartzell prop models 78" Bob On Jul 25, 2013, at 8:54 AM, Charles Brown wrote: > Here's the ticket for a stock Legacy prop, it's 70 inches as shown by the s= erial number (73 minus 3). Rickard's LIV prop appears to be 76 inches, from= the serial number. > >=20 > I too have a vibration in my Legacy IO-550 and have had dynamic balance ch= eck out perfect. It's around 20Hz, I'd guess, and the visible amplitude at t= he wingtips is about 1/4 inch. Most passengers don't notice it; I normally c= ruise at 2300 rpm; it seems a little smoother at higher rpm. I have a hard t= ime believing that all Hartzell 3-blade props on all Lancair 550s, regardles= s of diameter and horsepower, have the same problem; but now I wonder. =20 >=20 > Just before Placerville I let the USAF's chief F-16 test pilot fly my Lega= cy and he commented immediately on the vibration. I figured that's because h= e flies jets and gliders, neither of which ever vibrate... but my friend's 2= -blade RV-6 / O-320 doesn't have this vibration either... >=20 > Has anyone definitely flown a vibration-free IO-550 Lancair (or TSIO-550) w= ith *any* propeller? And by vibration-free, I mean it is free of low-freque= ncy 10-20Hz stuff, not the normal noise of flying. What I'm wondering is...= is it the 550, making such vibration with *any* propeller? >=20 > Charley Brown > Legacy RG 280hr >=20 >=20 >=20 > On Jul 23, 2013, at 6:37 AM, Steve Colwell wrote: >=20 > We have been chasing a vibration from the first few hours on our Legacy IO= -550 with stock compression and a Hartzell 3 blade. I don=E2=80=99t have ea= sy access to the prop model but it is the standard Hartzell supplied by Lanc= air for the IO-550.=20 > Our vibration varies in magnitude with power setting and air speed. It is= most noticeable with control stick shake but also could be felt on the dust= cover. I went thru an exhaustive series of finding engine/cowl contact po= ints, questioning gear doors, rechecking control surfaces, two prop balances= and an engine rebuild (cracked case). I thought it was almost fixed severa= l times since it was not easily replicated. Then it would come back, someti= mes very slightly, other times worse.=20 > Actually, this is a relief to know what the likely problem is after 5 year= s and 400 hours of chasing a fix. We just booked a Southwest round trip to O= SH. I really don=E2=80=99t want to be the next statistic. Thanks Bob and E= d. > =20 > Steve > =20 >=20 --Apple-Mail-46DDB7DD-DF14-4507-92C2-3B5996032807 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
I am pretty sure mine is a 78" prop. &= nbsp;See Lancair site


All Hartzell prop models 78"

Bob

On Jul 25, 2013, at 8:54 AM, Charles Brown <browncc1@verizon.net> wrote:

Here's the t= icket for a stock Legacy prop, it's 70 inches as shown by the serial number (= 73 minus 3).  Rickard's LIV prop appears to be 76 inches, from the seri= al number.
<PastedGraphic-1.png>

I t= oo have a vibration in my Legacy IO-550 and have had dynamic balance check o= ut perfect.  It's around 20Hz, I'd guess, and the visible amplitude at t= he wingtips is about 1/4 inch.  Most passengers don't notice it; I norm= ally cruise at 2300 rpm; it seems a little smoother at higher rpm.  I h= ave a hard time believing that all Hartzell 3-blade props on all Lancair 550= s, regardless of diameter and horsepower, have the same problem; but now I w= onder.  

Just before Placerville I let the USA= F's chief F-16 test pilot fly my Legacy and he commented immediately on the v= ibration.  I figured that's because he flies jets and gliders, neither o= f which ever vibrate...  but my friend's 2-blade RV-6 / O-320 doesn't h= ave this vibration either...

Has anyone definitely f= lown a vibration-free IO-550 Lancair (or TSIO-550) with *any* propeller? &nb= sp;And by vibration-free, I mean it is free of low-frequency 10-20Hz stuff, n= ot the normal noise of flying.  What I'm wondering is...  is it th= e 550, making such vibration with *any* propeller?

= Charley Brown
Legacy RG  280hr


<= /div>
On Jul 23, 2013, at 6:37 AM, Steve Colwell wrote:
We have been chasing a vibration from the first few hours on our L= egacy IO-550 with stock compression and a Hartzell 3 blade.  I don=E2=80= =99t have easy access to the prop model but it is the standard Hartzell supp= lied by Lancair for the IO-550. 
Our vibration varies in magnitude with power setting and air speed.  I= t is most noticeable with control stick shake but also could be felt on the d= ust cover.   I went thru an exhaustive series of finding engine/co= wl contact points, questioning gear doors, rechecking control surfaces, two p= rop balances and an engine rebuild (cracked case).  I thought it was al= most fixed several times since it was not easily replicated.  Then it w= ould come back, sometimes very slightly, other times worse. =
Actually, this is a relief to know what the like= ly problem is after 5 years and 400 hours of chasing a fix.  We just bo= oked a Southwest round trip to OSH.  I really don=E2=80=99t want to be t= he next statistic.  Thanks Bob and Ed.
 
Steve=
 

= --Apple-Mail-46DDB7DD-DF14-4507-92C2-3B5996032807--