X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 28 Jul 2013 14:37:30 -0400 Message-ID: X-Original-Return-Path: Received: from oproxy14-pub.unifiedlayer.com ([67.222.51.224] verified) by logan.com (CommuniGate Pro SMTP 6.0.5) with SMTP id 6394231 for lml@lancaironline.net; Sun, 28 Jul 2013 14:24:04 -0400 Received-SPF: neutral receiver=logan.com; client-ip=67.222.51.224; envelope-from=danny@n107sd.com Received: (qmail 13212 invoked by uid 0); 28 Jul 2013 18:23:29 -0000 Received: from unknown (HELO host295.hostmonster.com) (66.147.240.95) by oproxy14.unifiedlayer.com with SMTP; 28 Jul 2013 18:23:29 -0000 Received: from [98.233.210.64] (port=49343 helo=DannysW7PC) by host295.hostmonster.com with esmtpa (Exim 4.80) (envelope-from ) id 1V3Vcv-00048X-69 for lml@lancaironline.net; Sun, 28 Jul 2013 12:23:29 -0600 From: "Danny" X-Original-To: "'Lancair Mailing List'" References: In-Reply-To: Subject: RE: [LML] Re: Potential Problem-Engine Vibration X-Original-Date: Sun, 28 Jul 2013 14:23:27 -0400 X-Original-Message-ID: <000301ce8bbf$8e894be0$ab9be3a0$@n107sd.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0004_01CE8B9E.077EB0C0" X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQFcihLrECwB9YmkPwEQp8alQuCVZ5peaquQ Content-Language: en-us X-Identified-User: {3234:host295.hostmonster.com:wunderwe:n107sd.com} {sentby:smtp auth 98.233.210.64 authed with danny@n107sd.com} This is a multipart message in MIME format. ------=_NextPart_000_0004_01CE8B9E.077EB0C0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable WHAT? That makes no sense at all. Where did you ever get such an idea? =20 Danny LNC2-360 Mk-II Nothing is foolproof to the sufficiently talented fool. =20 From: Craig Schulze [mailto:craig@skybolt.net]=20 Sent: Sunday, July 28, 2013 2:21 PM To: lml@lancaironline.net Subject: [LML] Re: Potential Problem-Engine Vibration =20 It could be possible for wear or manufacturing process to allow one = blade to have more play in pitch operation than the others.=20 Blue Skies, Craig Schulze=20 On Jul 27, 2013, at 5:36 PM, vtailjeff@aol.com wrote: How is that mechanically possible? All blades are attached to the same = pitch change mechanism. =20 J Sent from my iPad On Jul 27, 2013, at 12:34 PM, Steve Colwell = wrote: That is a possibility I had not considered, I will ask Hartzell about = it. Another possibility is the movable crankshaft counter weights = failing to position correctly. Steve Colwell =20 =20 =20 _____ =20 From: Craig Schulze To: Steve Colwell =20 Cc: "lml@lancaironline.net" =20 Sent: Friday, July 26, 2013 7:42 AM Subject: Re: Potential Problem-Engine Vibration It sounds to me that you may have an issue with your prop hub not = changing the pitch exactly the same on all the blades. The vibration = you are feeling is one blade taking a larger bite of air and then = causing everything to wobble. It settles in sometimes but when you = change the power setting the pitch on the prop is adjusted by the hub = unevenly. =20 Blue Skies, Craig Schulze Lancair N73S On Jul 25, 2013, at 1:22 PM, "Steve Colwell" = wrote: In the first 40 hours I had vibration so severe it caused stick shake. = This has continued intermittently more or less for almost 400 hours. First I found and fixed several Cowl Interference locations, then = adjusted and notched the hat section of the nose gear door. At about 50 hours I paid Barrett to tear down the engine to replace the Performance pistons (prematurely worn top rings) with stock ECI pistons. Also found a cracked case. We had the Kelly Alternator balanced and rebuilt at a shop recommended = by Bill Bainbridge of B & C. Sorry I can't remember the name, the Legacy = file is in Texas.=20 I rounded the leading edges of the elevator counter weights when = building so I temporarily squared them off to go back to the stock shape for = testing. All gear doors were checked in flight with video camera.=20 The pitch trim hinge pin had play, I replaced it per Chris Zavatson's = web page. Along the way the prop was balanced twice. I could not get more that the usual vibration (which always seemed to be = too much) on test flights. Then, unpredictably, vibration magnitude would increase with power reduction on some later flight. I say unpredictably because I could not get increased vibration by attempting to duplicate previous conditions. Let's hope a solution surfaces at Airventure. Steve Colwell Legacy RG IO550-N with Hartzell 3 Blade -----Original Message----- From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of = Paul Miller Sent: Thursday, July 25, 2013 7:22 AM To: lml@lancaironline.net Subject: [LML] Re: Potential Problem-Engine Vibration Ed Martin's legacy is smooth. Mine has had a lot of annoying vibes as = you describe but virtually all have been removed with lots of cowling interference fixes and plug change. Many pilots forget the alternator = can be a wicked source of vibration and it is almost in the same plane as = the prop. The problems I had originally were in that freq range and visible at the wingtip also. Paul ------=_NextPart_000_0004_01CE8B9E.077EB0C0 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

WHAT?=C2=A0 That makes no sense at all.=C2=A0 = Where did you ever get such an idea?

 

Danny

LNC2-360 = Mk-II

Nothing is foolproof to the sufficiently = talented fool.

 

From:= = Craig Schulze [mailto:craig@skybolt.net]
Sent: Sunday, July = 28, 2013 2:21 PM
To: lml@lancaironline.net
Subject: = [LML] Re: Potential Problem-Engine = Vibration

 

It = could be possible for wear or manufacturing process to allow one blade = to have more play in pitch operation than the others. 

Blue = Skies,

Craig = Schulze 


On Jul 27, 2013, at 5:36 PM, vtailjeff@aol.com = wrote:

How is that mechanically possible? All blades are = attached to the same pitch change mechanism.

 

J

Sent from my iPad


On Jul 27, 2013, at = 12:34 PM, Steve Colwell <mcmess1919@yahoo.com> = wrote:

That is a possibility I had not considered, I will = ask Hartzell about it.  Another possibility is the movable = crankshaft counter weights failing to position correctly.

Steve = Colwell 

 

 

F= rom: = Craig Schulze <craig@skybolt.net>
To:= Steve Colwell <mcmess1919@yahoo.com> =
Cc: "lml@lancaironline.net" = <lml@lancaironline.net> =
Sent: Friday, July 26, 2013 7:42 AM
Subject: Re: = Potential Problem-Engine Vibration


It sounds to me that you may have an issue = with your prop hub not changing the pitch exactly the  same on all = the blades.  The vibration you are feeling is one blade taking a = larger bite of air and then causing everything to wobble.  It = settles in sometimes but when you change the power setting the pitch on = the prop is adjusted by the hub unevenly. 

Blue = Skies,
Craig Schulze
Lancair N73S


On Jul 25, 2013, at = 1:22 PM, "Steve Colwell" <mcmess1919@yahoo.com> = wrote:

In the first 40 hours I had vibration so severe it caused = stick shake.  This
has continued intermittently more or less for = almost 400 hours.

First I found and fixed several Cowl = Interference locations, then adjusted
and notched the hat section of = the nose gear door.

At about 50 hours I paid Barrett to tear down = the engine to replace the
Performance pistons (prematurely worn top = rings) with stock ECI pistons.
Also found a cracked case.

We = had the Kelly Alternator balanced and rebuilt at a shop recommended = by
Bill Bainbridge of B & C.  Sorry I can't remember the = name, the Legacy file
is in Texas.

I rounded the leading = edges of the elevator counter weights when building so
I temporarily = squared them off to go back to the stock shape for testing.

All = gear doors were checked in flight with video camera.

The pitch = trim hinge pin had play, I replaced it per Chris Zavatson's = web
page.

Along the way the prop was balanced twice.

I = could not get more that the usual vibration (which always seemed to be = too
much) on test flights.  Then, unpredictably, vibration = magnitude would
increase with power reduction on some later = flight.  I say unpredictably
because I could not get increased = vibration by attempting to duplicate
previous conditions.  Let's = hope a solution surfaces at Airventure.

Steve Colwell  = Legacy RG IO550-N with Hartzell 3 Blade



-----Original = Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On = Behalf Of Paul
Miller
Sent: Thursday, July 25, 2013 7:22 AM
To: = lml@lancaironline.net
Subjec= t: [LML] Re: Potential Problem-Engine Vibration

Ed Martin's = legacy is smooth.  Mine has had a lot of annoying vibes as = you
describe but virtually all have been removed with lots of = cowling
interference fixes and plug change.  Many pilots forget = the alternator can
be a wicked source of vibration and it is almost = in the same plane as the
prop.

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

Paul


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