X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 06 Jun 2007 13:13:50 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m21.mx.aol.com ([64.12.137.2] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2087524 for lml@lancaironline.net; Wed, 06 Jun 2007 12:07:33 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.2; envelope-from=VTAILJEFF@aol.com Received: from VTAILJEFF@aol.com by imo-m21.mx.aol.com (mail_out_v38_r9.2.) id q.c1c.1783037d (52630) for ; Wed, 6 Jun 2007 12:06:40 -0400 (EDT) Received: from WEBMAIL-RA20 (webmail-ra20.webmail.aol.com [152.163.181.160]) by cia-d13.mx.aol.com (v115.17) with ESMTP id MAILCIAD132-cd964666db9075; Wed, 06 Jun 2007 12:06:40 -0400 References: X-Original-To: lml@lancaironline.net Subject: Re: [LML] Re: IV-P Rudder Trim X-Original-Date: Wed, 06 Jun 2007 12:06:40 -0400 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_8C9766BCD9012E9_BAC_1CFC_WEBMAIL-RA20.sysops.aol.com" X-Mailer: AOL WebMail 27618 Received: from 216.7.152.26 by WEBMAIL-RA20.sysops.aol.com (152.163.181.160) with HTTP (WebMailUI); Wed, 06 Jun 2007 12:06:40 -0400 X-Original-Message-Id: <8C9766BCD9012E9-BAC-ED3@WEBMAIL-RA20.sysops.aol.com> X-AOL-IP: 152.163.181.160 X-Spam-Flag: NO ----------MB_8C9766BCD9012E9_BAC_1CFC_WEBMAIL-RA20.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Lanny, Who's airplane was this. 1" sounds like a lot of movement on an elevator tri= m tab. I don't even think they travel 1" stop to stop, so how could this be? Jeff I=E2=80=99m new to the LML site but I have built several aircraft over the y= ears.=C2=A0 One thing that scares me on the Lancair is flutter.=C2=A0 I rece= ntly found a IV elevator trim that could easily be moved up and down as much= as 1=E2=80=9D at the trailing edge.=C2=A0 It turned out to the hinge that t= he tab was attached to was bending.=C2=A0 -----Original Message----- From: Kevin Stallard To: lml@lancaironline.net Sent: Wed, 6 Jun 2007 8:34 am Subject: [LML] Re: IV-P Rudder Trim I=E2=80=99m not anywhere near an expert on flutter, but isn=E2=80=99t flutte= r destructive?=C2=A0 I mean if an airframe experiences flutter, it doesn=E2= =80=99t just wear out hinges, my understanding is the airframe ceases to be=20= an airframe at that point.=C2=A0 I don=E2=80=99t recall having ever read abo= ut any mid-flight break up of a Lancair except those that happen to wander i= nto a thunderstorm here and there. =C2=A0 Vibration is completely different and there could be other reasons at =E2= =80=9Cplay=E2=80=9D regarding the premature wearing of these hinges.=C2=A0 C= hris Zavatson has some interesting things on hinges and vibration, give it a= read=E2=80=A6 =C2=A0 http://www.n91cz.com/HingePlay/hinges.htm =C2=A0 Bottom line, I don=E2=80=99t think flutter in a Lancair is worth worrying ab= out=E2=80=A6 =C2=A0 Kevin =C2=A0 =C2=A0 Scott, I=E2=80=99m new to the LML site but I have built several aircraft over the y= ears.=C2=A0 One thing that scares me on the Lancair is flutter.=C2=A0 I rece= ntly found a IV elevator trim that could easily be moved up and down as much= as 1=E2=80=9D at the trailing edge.=C2=A0 It turned out to the hinge that t= he tab was attached to was bending.=C2=A0 The owner had not had a problem wi= th flutter but the hinge was completely worn out due to vibration in only a=20= couple hundred hours.=C2=A0 Lowering the attach point on the horn reduces th= e leverage and increases the movement of the tab.=C2=A0 This will make it to= o sensitive and lessen the arm needed to prevent flutter.=C2=A0 I don=E2=80= =99t recommend it. Lanny=20 =C2=A0 ________________________________________________________________________ AOL now offers free email to everyone. Find out more about what's free from= AOL at AOL.com. ----------MB_8C9766BCD9012E9_BAC_1CFC_WEBMAIL-RA20.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8"
Lanny,
=C2=A0
Who's airplane was this. 1" sounds like a lot of movement on an elevato= r trim tab. I don't even think they travel 1" stop to stop, so how could thi= s be?
=C2=A0
Jeff
I=E2=80=99m new to the LML site but I have built seve= ral aircraft over the years.=C2=A0 One thing that scares me on the Lancair i= s flutter.=C2=A0 I recently found a IV elevator trim that could easily be mo= ved up and down as much as 1=E2=80=9D at the trailing edge.=C2=A0 It turned=20= out to the hinge that the tab was attached to was bending.=C2=A0



-----Original Message-----
From: Kevin Stallard
To: lml@lancaironline.net
Sent: Wed, 6 Jun 2007 8:34 am
Subject: [LML] Re: IV-P Rudder Trim

I=E2=80=99m not anywhe= re near an expert on flutter, but isn=E2=80=99t flutter destructive?=C2=A0 I= mean if an airframe experiences flutter, it doesn=E2=80=99t just wear out h= inges, my understanding is the airframe ceases to be an airframe at that poi= nt.=C2=A0 I don=E2=80=99t recall having ever read about any mid-flight break= up of a Lancair except those that happen to wander into a thunderstorm here= and there.
=C2=A0
Vibration is completel= y different and there could be other reasons at =E2=80=9Cplay=E2=80=9D regar= ding the premature wearing of these hinges.=C2=A0 Chris Zavatson has some in= teresting things on hinges and vibration, give it a read=E2=80=A6
=C2=A0
http://www.n91cz.com/HingePl= ay/hinges.htm
=C2=A0
Bottom line, I don=E2= =80=99t think flutter in a Lancair is worth worrying about=E2=80=A6
=C2=A0
Kevin
=C2=A0
=C2=A0
Scott,
I=E2=80=99m new to the= LML site but I have built several aircraft over the years.=C2=A0 One thing=20= that scares me on the Lancair is flutter.=C2=A0 I recently found a IV elevat= or trim that could easily be moved up and down as much as 1=E2=80=9D at the=20= trailing edge.=C2=A0 It turned out to the hinge that the tab was attached to= was bending.=C2=A0 The owner had not had a problem with flutter but the hin= ge was completely worn out due to vibration in only a couple hundred hours.= =C2=A0 Lowering the attach point on the horn reduces the leverage and increa= ses the movement of the tab.=C2=A0 This will make it too sensitive and lesse= n the arm needed to prevent flutter.=C2=A0 I don=E2=80=99t recommend it.
Lanny
=C2=A0
AOL now offers free email to everyone. Find out more about what's free from= AOL at AOL.com.
----------MB_8C9766BCD9012E9_BAC_1CFC_WEBMAIL-RA20.sysops.aol.com--