X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 24 May 2011 13:23:22 -0400 Message-ID: X-Original-Return-Path: Received: from qmta13.westchester.pa.mail.comcast.net ([76.96.59.243] verified) by logan.com (CommuniGate Pro SMTP 5.4c3j) with ESMTP id 4992708 for lml@lancaironline.net; Tue, 24 May 2011 06:04:24 -0400 Received-SPF: pass receiver=logan.com; client-ip=76.96.59.243; envelope-from=mjrav@comcast.net Received: from omta07.westchester.pa.mail.comcast.net ([76.96.62.59]) by qmta13.westchester.pa.mail.comcast.net with comcast id nN1e1g0011GhbT85DN3qcP; Tue, 24 May 2011 10:03:50 +0000 Received: from mjr ([24.60.90.39]) by omta07.westchester.pa.mail.comcast.net with comcast id nN3p1g00B0qwbqo3TN3ql6; Tue, 24 May 2011 10:03:50 +0000 X-Original-Message-ID: <002c01cc19f9$eb4795b0$6701a8c0@mjr> From: "Mark Ravinski" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Re: FW: LNC2 Vibration Issues X-Original-Date: Tue, 24 May 2011 06:04:06 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0029_01CC19D8.63F73F00" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.2001 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.2001 This is a multi-part message in MIME format. ------=_NextPart_000_0029_01CC19D8.63F73F00 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable If you point the nose down and have the engine produce the same amount = of power you will go much faster and changing vibrations might be = suspected to be airspeed or airframe related. However, I suspect that pointing the nose down does take some of the = load off of the engine. What does it do in a 700 fpm climb? Mark Ravinski ----- Original Message -----=20 From: TOM GARDINER=20 To: lml@lancaironline.net=20 Sent: Monday, May 23, 2011 8:03 AM Subject: [LML] Re: FW: LNC2 Vibration Issues Folks, I appreciate the great response from the LML list to my vibration = problem. I have checked everything that was mentioned in the emails. = Most people including myself suspect a tracking issue. But here is the = rub: On the ground the tracking appears to be perfect with the engine = noyt running. Now this is where it gets interesting, in cruise and = level flight at 24"/2400RPM I can see some dither on my ASI and feel the = vibration thorugh the airframe. Now if I point the plane downhill at = say 700fpm or more and the same power setting everything smoothes out! =20 =20 This to me suggests something in the prop tracking or engine mounting = arrangement since right turning P factor is less with the nose below the = horizon. Any ideas? Thanks=20 Tom LNC2 50 hrs -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG - www.avg.com=20 Version: 9.0.901 / Virus Database: 271.1.1/3655 - Release Date: = 05/23/11 02:35:00 ------=_NextPart_000_0029_01CC19D8.63F73F00 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
If you point the nose down and have the = engine=20 produce the same amount of power you will go much faster and changing = vibrations=20 might be suspected to be airspeed or airframe related.
However, I suspect that pointing the = nose down does=20 take some of the load off of the engine.
What does it do in a 700 fpm = climb?
 
Mark Ravinski
----- Original Message -----
From:=20 TOM = GARDINER=20
Sent: Monday, May 23, 2011 8:03 = AM
Subject: [LML] Re: FW: LNC2 = Vibration=20 Issues



Folks,
 

I = appreciate the=20 great response from the LML list to my vibration problem.  I have = checked=20 everything that was mentioned in the emails.  Most people = including=20 myself suspect a tracking issue. But here is the rub:  On the = ground the=20 tracking appears to be perfect with the engine noyt running.  Now = this is=20 where it gets interesting, in cruise and level flight at = 24"/2400RPM I=20 can see some dither on my ASI and feel the vibration thorugh the=20 airframe.  Now if I point the plane downhill at say 700fpm or = more and=20 the same power setting everything smoothes out! 

 

This to = me suggests=20 something in the prop tracking or engine mounting arrangement since = right=20 turning P factor is less with the nose below the horizon.  Any=20 ideas?

 

Thanks =

 

Tom

 

LNC2 50=20 hrs


No virus found in this incoming message.
Checked by AVG = -=20 www.avg.com
Version: 9.0.901 / Virus Database: 271.1.1/3655 - = Release=20 Date: 05/23/11 02:35:00
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