X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 27 Jul 2013 13:34:56 -0400 Message-ID: X-Original-Return-Path: Received: from nm36.bullet.mail.ne1.yahoo.com ([98.138.229.29] verified) by logan.com (CommuniGate Pro SMTP 6.0.5) with ESMTPS id 6393340 for lml@lancaironline.net; Sat, 27 Jul 2013 12:17:05 -0400 Received-SPF: none receiver=logan.com; client-ip=98.138.229.29; envelope-from=mcmess1919@yahoo.com Received: from [127.0.0.1] by nm36.bullet.mail.ne1.yahoo.com with NNFMP; 27 Jul 2013 16:16:30 -0000 Received: from [98.138.101.128] by nm36.bullet.mail.ne1.yahoo.com with NNFMP; 27 Jul 2013 16:16:13 -0000 Received: from [98.138.89.254] by tm16.bullet.mail.ne1.yahoo.com with NNFMP; 27 Jul 2013 16:16:13 -0000 Received: from [127.0.0.1] by omp1046.mail.ne1.yahoo.com with NNFMP; 27 Jul 2013 16:16:13 -0000 X-Yahoo-Newman-Property: ymail-4 X-Yahoo-Newman-Id: 650850.79743.bm@omp1046.mail.ne1.yahoo.com Received: (qmail 36931 invoked by uid 60001); 27 Jul 2013 16:16:13 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Rocket-MIMEInfo:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:Cc:In-Reply-To:MIME-Version:Content-Type; b=gkXwRYdWhh686Lxo5uXaCXWKzhIJTBj4VT6/yIIbjRWHg3iH2aj7aDLldDJiiWBRgYpK+E7RbSfDLbKGzftzRmIaSUVlk5vGgqjy00qFYgxKkhHhZWKqMDarrF2bjLfyn9slWjMhihKq7/t3F3tW1f1qTGvfMZfgXyr8wZJnsfU=; X-YMail-OSG: 3blDAScVM1mlG1bzhXA4YmMcHb26goHxfeHl4At7lrSPUgw bNRZeouEd_XNOWhXqBQxT1SpAjkYMslFcNGnB7h7ZMFl00hT8IWLx5FtevFx 4vEeJ3iNZd6JpmqgjlbQsxBd_HSd4YYjlHx3zC3caI4DI8qgZyS_mnRaT.KT j.vzxTNh7Je4Qxb4dkdK5bcr8w2.ZoowhqSMDfwcbmovCY1ZEK2RhkBCZWxs JPaUsTmz9co14utovsl.1sq5a7JDP0FLhvocwvR20VJ7vysbtO6dw6D25cl1 BcqOwIOzF2opeERDCcsIvSsqcb0YNI5oz15Ia_LDf9AbnMvsFBdzi3Akf16M kK7I490vB_.HrRJxB5zuoA2S8_5qOw2cRNSO1OoXZ4IrBVHYydqod01uqQdb ZbJG7g0yAUZ21f6ScypLPz9AmmACk_G4xTYid0nP829mw9C8oMw2.VpnyUwQ OauQq3x_sm_LMCz08a_lbETC.nz9VuMfnK0aSdZ4s7MCDOQlZ6rmaVJrvr6X TVoUwMi6MCn0nBkLTYKtc5DcZxFH.pkEMYs4W5NkTUKR2zB99bc1MrcWaTma _3hzehQSQs3Bnue0g1oE4 Received: from [66.168.71.54] by web126101.mail.ne1.yahoo.com via HTTP; Sat, 27 Jul 2013 09:16:13 PDT X-Rocket-MIMEInfo: 002.001,VGhhdCBpcyBhIHBvc3NpYmlsaXR5IEkgaGFkIG5vdCBjb25zaWRlcmVkLCBJIHdpbGwgYXNrIEhhcnR6ZWxsIGFib3V0IGl0LsKgIEFub3RoZXIgcG9zc2liaWxpdHkgaXMgdGhlIG1vdmFibGUgY3JhbmtzaGFmdCBjb3VudGVyIHdlaWdodHMgZmFpbGluZyB0byBwb3NpdGlvbiBjb3JyZWN0bHkuCgpTdGV2ZSBDb2x3ZWxswqAgCgoKCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwogRnJvbTogQ3JhaWcgU2NodWx6ZSA8Y3JhaWdAc2t5Ym9sdC5uZXQ.ClRvOiBTdGV2ZSBDb2x3ZWxsIDxtY21lc3MBMAEBAQE- X-Mailer: YahooMailWebService/0.8.150.561 References: <071F87AF-E272-41BA-9656-FFB54D86FDF9@skybolt.net> X-Original-Message-ID: <1374941773.36381.YahooMailNeo@web126101.mail.ne1.yahoo.com> X-Original-Date: Sat, 27 Jul 2013 09:16:13 -0700 (PDT) From: Steve Colwell Reply-To: Steve Colwell Subject: Re: Potential Problem-Engine Vibration X-Original-To: Craig Schulze X-Original-Cc: "lml@lancaironline.net" In-Reply-To: <071F87AF-E272-41BA-9656-FFB54D86FDF9@skybolt.net> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-1476493434-667250407-1374941773=:36381" ---1476493434-667250407-1374941773=:36381 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable That is a possibility I had not considered, I will ask Hartzell about it.= =A0 Another possibility is the movable crankshaft counter weights failing t= o position correctly.=0A=0ASteve Colwell=A0 =0A=0A=0A=0A=0A________________= ________________=0A From: Craig Schulze =0ATo: Steve Col= well =0ACc: "lml@lancaironline.net" =0ASent: Friday, July 26, 2013 7:42 AM=0ASubject: Re: Potential Pro= blem-Engine Vibration=0A =0A=0AIt sounds to me that you may have an issue w= ith your prop hub not changing the pitch exactly the=A0 same on all the bla= des.=A0 The vibration you are feeling is one blade taking a larger bite of = air and then causing everything to wobble.=A0 It settles in sometimes but w= hen you change the power setting the pitch on the prop is adjusted by the h= ub unevenly.=A0 =0A=0ABlue Skies,=0ACraig Schulze=0ALancair N73S=0A=0A=0AOn= Jul 25, 2013, at 1:22 PM, "Steve Colwell" wrote:=0A= =0AIn the first 40 hours I had vibration so severe it caused stick shake.= =A0 This=0Ahas continued intermittently more or less for almost 400 hours.= =0A=0AFirst I found and fixed several Cowl Interference locations, then adj= usted=0Aand notched the hat section of the nose gear door.=0A=0AAt about 50= hours I paid Barrett to tear down the engine to replace the=0APerformance = pistons (prematurely worn top rings) with stock ECI pistons.=0AAlso found a= cracked case.=0A=0AWe had the Kelly Alternator balanced and rebuilt at a s= hop recommended by=0ABill Bainbridge of B & C.=A0 Sorry I can't remember th= e name, the Legacy file=0Ais in Texas. =0A=0AI rounded the leading edges of= the elevator counter weights when building so=0AI temporarily squared them= off to go back to the stock shape for testing.=0A=0AAll gear doors were ch= ecked in flight with video camera. =0A=0AThe pitch trim hinge pin had play,= I replaced it per Chris Zavatson's web=0Apage.=0A=0AAlong the way the prop= was balanced twice.=0A=0AI could not get more that the usual vibration (wh= ich always seemed to be too=0Amuch) on test flights.=A0 Then, unpredictably= , vibration magnitude would=0Aincrease with power reduction on some later f= light.=A0 I say unpredictably=0Abecause I could not get increased vibration= by attempting to duplicate=0Aprevious conditions.=A0 Let's hope a solution= surfaces at Airventure.=0A=0ASteve Colwell=A0 Legacy RG IO550-N with Hartz= ell 3 Blade=0A=0A=0A=0A-----Original Message-----=0AFrom: Lancair Mailing L= ist [mailto:lml@lancaironline.net] On Behalf Of Paul=0AMiller=0ASent: Thurs= day, July 25, 2013 7:22 AM=0ATo: lml@lancaironline.net=0ASubject: [LML] Re:= Potential Problem-Engine Vibration=0A=0AEd Martin's legacy is smooth.=A0 M= ine has had a lot of annoying vibes as you=0Adescribe but virtually all hav= e been removed with lots of cowling=0Ainterference fixes and plug change.= =A0 Many pilots forget the alternator can=0Abe a wicked source of vibration= and it is almost in the same plane as the=0Aprop.=0A=0AThe problems I had = originally were in that freq range and visible at the=0Awingtip also.=0A=0A= Paul ---1476493434-667250407-1374941773=:36381 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
That is a possibility= I had not considered, I will ask Hartzell about it.  Another possibil= ity is the movable crankshaft counter weights failing to position correctly= .

Steve Colwell 


From: C= raig Schulze <craig@skybolt.net>
To: Steve Colwell <mcmess1919@yahoo.com>
Cc: "lml@lancaironline.net" <l= ml@lancaironline.net>
Sent: Friday, July 26, 2013 7:42 AM
Su= bject: Re: Potential Problem-Engine Vibration
=

It sounds to me that you may have an is= sue 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 larg= er bite of air and then causing everything to wobble.  It settles in s= ometimes but when you change the power setting the pitch on the prop is adj= usted by the hub unevenly. 

Blue Skies,
Craig Schulze
La= ncair N73S


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

In the first 40 hours I had vib= ration so severe it caused stick shake.  This
has continued intermi= ttently 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 t= ear 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 Le= gacy file
is in Texas.

I rounded the leading edges of the elevat= or 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 rep= laced it per Chris Zavatson's web
page.

Along the way the prop wa= s balanced twice.

I could not get more that the usual vibration (whi= ch 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 Messag= e-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Paul
Miller
Sent: Thursday, July 25, 2013 7:22 AMTo: lml@lancaironline.net
Subject: [LML] Re: Potential Probl= em-Engine Vibration

Ed Martin's legacy is smooth.  Mine has had= a lot of annoying vibes as you
describe but virtually all have been rem= oved 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 orig= inally were in that freq range and visible at the
wingtip also.

P= aul



---1476493434-667250407-1374941773=:36381--