X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 08 Dec 2008 13:55:17 -0500 Message-ID: X-Original-Return-Path: Received: from QMTA03.emeryville.ca.mail.comcast.net ([76.96.30.32] verified) by logan.com (CommuniGate Pro SMTP 5.2.10) with ESMTP id 3340633 for lml@lancaironline.net; Sun, 07 Dec 2008 13:20:09 -0500 Received-SPF: pass receiver=logan.com; client-ip=76.96.30.32; envelope-from=harryleague@comcast.net Received: from OMTA12.emeryville.ca.mail.comcast.net ([76.96.30.44]) by QMTA03.emeryville.ca.mail.comcast.net with comcast id oFbC1a0050x6nqcA3JKXhK; Sun, 07 Dec 2008 18:19:31 +0000 Received: from HarrysTecraS1 ([98.228.233.183]) by OMTA12.emeryville.ca.mail.comcast.net with comcast id oJKW1a0013y4zhN8YJKWJz; Sun, 07 Dec 2008 18:19:31 +0000 From: "Harry League" X-Original-To: "'Lancair Mailing List'" References: Subject: RE: [LML] Re: outback gear doors-vibration is back X-Original-Date: Sun, 7 Dec 2008 12:19:29 -0600 X-Original-Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0024_01C95866.0EA4F550" X-Mailer: Microsoft Office Outlook 11 Thread-Index: AclYHk9U8c8JJkBdRzKRDeCTDRtpkQAeblsQ In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_0024_01C95866.0EA4F550 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Just a thought: would a couple of air vents in the doors solve the problem? Start small and move larger until the noise stops or the doors stay shut. Regards, Harry League _____ From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of marv@lancair.net Sent: Saturday, December 06, 2008 21:46 PM To: lml@lancaironline.net Subject: [LML] Re: outback gear doors-vibration is back Posted for mquinns@aol.com: Dom, AC-DC is not to my taste but listening to them would be far more musical and pleasant than gear door rumblings. Attached is a close up picture of a musical nocturne. Mark -----Original Message----- From: Dominic V. Crain To: lml@lancaironline.net Sent: Fri, 5 Dec 2008 12:06 pm Subject: [LML] Re: outback gear doors-vibration is back I would think that the gear doors rumbling would be far more musical than listening to AC-DC. Cheers Dom VH-CZJ From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of mquinns@aol.com Sent: Friday, 5 December 2008 3:25 PM To: lml@lancaironline.net Subject: [LML] Re: outback gear doors-vibration is back Gerard, I had the same problem. Whenever the airspeed started moving past 210 knots a buzz would start and then turn into a rumble as the plane went faster. If the aircraft was decelerated......to a speed around 205 knots, the rumbling and buzzing would disappear but would reappear if the aircraft accelerated back above 210 knots. I was certain it was the nose gear door (made from fiberglass) so I took the advice in archive and fabricated a much stiffer aluminum door. To my surprise the buzzing and rumbling problem was still there over certain speeds.!!!!???!!!! Fortunately for me, I live at at a place where we formation fly to breakfast every Saturday and I usually fly with the SX-300 guys. One of these friends volunteered to go up with me and formate under me to see if the problem could be observed. Apparently, the main gear doors trailing edges are being sucked out into the slipstream at certain airspeeds. We repeated the speed runs (accelerate/decelerate) and proble! m was clear. My plane does have a difference with yours which is, even though I have the outback gear, I decided to use the original cutout doors thinking they would create less drag. Don't know whether they do or not but have been unable after many different attempts to keep the doors closed at high speed. In January I will be racing and afterwards plan on doing a major condition inspection (demating wings, removing all control surfaces, etc) and at that time will fit the original outback gear doors from the option kit. They do appear to be stiffer (I hope they don't generate more drag). I hope that this cures my problem. Some of the Reno racers have recommended stiffening gear doors because this is a common problem for them while racing. If you find a magic bullet to correct the problem, please post it. Mark Quinn Lancair 360 Spruce Creek Fly-in, Florida -----Original Message----- From: gerardoconnell@optusnet.com.au To: lml@lancaironline.net Sent: Wed, 3 Dec 2008 9:15 pm Subject: [LML] outback gear doors-vibration is back Hi Ian and those whom have had gear door problems -Gerard from Down Under/Up Over has gremlins again Hope you're going well and enjoying you're flying. I'm just writing a quick note both on and off list as we've been over this ground before. Do you recall discussing the buzzing noise I had some time back which I resolved both by removing the nose gear door and overlapping the main and inboard gear doors to get better "purchase" and stop vibration. Well guess what? Thhe noise is now starting to return-I initially thought I had the bass turned up too much whilst listening to AC -DC but even with the radio off I can appreciate the buzz from outside the aircraft. Perhaps I need to listen to Robbie Williams instead? I originally spent thousands of $ trying various solutions to this problem and the final fix has worked for about 200 hours. I understand that some have also extended the door hinge/bracket to address this problem. In short, my question is this-did you have this buzzing/vibration problem and what methods did you employ before removing the inner gear doors altogether? Is this my best short cut to making the problem go away once and for all? Your thoughts would be appreciated including and issues you mar or may nopt have experienced after removing the inner doors. Cheers, Gerard -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html Listen to 350+ music, sports, & news radio stations - including songs for the holidays - FREE while you browse. Start Listening Now! ------=_NextPart_000_0024_01C95866.0EA4F550 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Just a thought:  would a = couple of air vents in the doors solve the problem?   Start small and move = larger until the noise stops or the doors stay shut.

 

Regards,

Harry League

 

=

 

=

From: = Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of marv@lancair.net
Sent: Saturday, December = 06, 2008 21:46 PM
To: = lml@lancaironline.net
Subject: [LML] Re: = outback gear doors-vibration is back

 


Posted for mquinns@aol.com:

 Dom,
     AC-DC is not to my taste but listening to them = would be far more musical
and pleasant than gear door rumblings. Attached is a close up picture of = a
musical nocturne.
 
 Mark
 
 
 -----Original Message-----
From: Dominic V. Crain <domcrain@tpg.com.au>
 To: lml@lancaironline.net
 Sent: Fri, 5 Dec 2008 12:06 pm
 Subject: [LML] Re: outback gear doors-vibration is back
 
 
 
 
 I would think that the gear doors rumbling would be far more = musical than
listening to AC-DC.
 
  
 
 Cheers
 
 Dom
 
 VH-CZJ
 
  
 
 
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of =
mquinns@aol.com
 Sent: Friday, 5 December 2008 3:25 PM
 To: lml@lancaironline.net
 Subject: [LML] Re: outback gear doors-vibration is back
 
 
  
 
 Gerard,
    I had the same problem. Whenever the airspeed started = moving past 210
knots a buzz would start and then turn into a rumble as the plane went = faster.
If the aircraft was decelerated......to a speed around 205 knots, the = rumbling
and buzzing would disappear but would reappear if the aircraft = accelerated
back above 210 knots. I was certain it was the nose gear door (made from =
fiberglass) so I took the advice in archive and fabricated a much = stiffer
aluminum door. To my surprise the buzzing and rumbling problem was still = there
over certain speeds.!!!!???!!!! Fortunately for me, I live at at a place = where
we formation fly to breakfast every Saturday and I usually fly with the = SX-300
guys. One of these friends volunteered to go up with me and formate = under me
to
 see if the problem could be observed. Apparently, the main gear = doors
trailing edges are being sucked out into the slipstream at certain = airspeeds.
We repeated the speed runs (accelerate/decelerate) and proble! m was = clear.
    My plane does have a difference with yours which is, = even though I have
the outback gear, I decided to use the original cutout doors = thinking they
would create less drag. Don't know whether they do or not but have been = unable
after many different attempts to keep the doors closed at high speed. In =
January I will be racing and afterwards plan on doing a major condition =
inspection (demating wings, removing all control surfaces, etc) and at = that
time will fit the original outback gear doors from the option kit. They = do
appear to be stiffer (I hope they don't generate more drag). I hope that = this
cures my problem. Some of the Reno racers have recommended stiffening gear
doors because this is a common problem for them while racing. If you = find a
magic bullet to correct the problem, please post it. 
 
 Mark Quinn
 Lancair 360
 Spruce Creek Fly-in, Florida
 
 
 -----Original Message-----
From: gerardoconnell@optusnet.com.au
 To: lml@lancaironline.net
 Sent: Wed, 3 Dec 2008 9:15 pm
 Subject: [LML] outback gear doors-vibration is back
 
 
  
 
  
 
 Hi Ian and those whom have had gear door problems
 
  
 
 -Gerard from Down Under/Up Over has gremlins again
 
  
 
  
 
 Hope you're going well and enjoying you're flying. I'm just = writing a quick
note
 
 both on and off
 list as we've been over this ground before.
 
  
 
 Do you recall discussing the buzzing noise I had some time back = which I
resolved
 
 both by removing the nose gear door and overlapping the main and = inboard gear
 
 doors to get better "purchase" and stop vibration.
 
  
 
 Well guess what?   Thhe noise is now starting to = return-I initially thought I
 
 had the bass turned up too much whilst listening to AC -DC but = even with the
 
 radio off I can appreciate the buzz from outside the aircraft. =
 
  
 
 Perhaps I need to listen to Robbie Williams instead?
 
  
 
 I originally spent thousands of $ trying various solutions to this problem
and
 
 the final fix has worked for about 200 hours. I understand that = some have
also
 
 extended the door hinge/bracket to address this problem.
 
  
 
 In short, my question is this-did you have this buzzing/vibration = problem and
 
 what methods did you employ before removing the inner gear doors altogether?
Is
 
 this my best short cut to making the problem go away once and for = all?
 
  
 
 Your thoughts would be appreciated including and issues you mar or = may nopt
have
 
 experienced after removing the inner doors.
 
  
 
  
 
 Cheers,
 
  
 
 Gerard
 
  
 
  
 
  
 
  
 
  
 
 --
 
For archives and unsub = http://mail.lancaironline.net:81/lists/lml/List.html
 
 
 
  
 
 
 
 Listen to 350+ music, sports, & news radio stations – = including songs for the
holidays – FREE while you browse.
 Start Listening Now!
 
 
 

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