X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 17 Apr 2011 11:13:19 -0400 Message-ID: X-Original-Return-Path: Received: from vms173003pub.verizon.net ([206.46.173.3] verified) by logan.com (CommuniGate Pro SMTP 5.4c3j) with ESMTP id 4948788 for lml@lancaironline.net; Sun, 17 Apr 2011 07:34:03 -0400 Received-SPF: pass receiver=logan.com; client-ip=206.46.173.3; envelope-from=danny.miller@verizon.net Received: from DannyLaptop ([unknown] [71.114.0.132]) by vms173003.mailsrvcs.net (Sun Java(tm) System Messaging Server 7u2-7.02 32bit (built Apr 16 2009)) with ESMTPA id <0LJS007W4O3MHW3A@vms173003.mailsrvcs.net> for lml@lancaironline.net; Sun, 17 Apr 2011 06:33:23 -0500 (CDT) From: "Danny Miller" X-Original-To: "'Louis Gabriel'" X-Original-Cc: References: In-reply-to: Subject: RE: 360 carbon/racing gear doors X-Original-Date: Sun, 17 Apr 2011 07:33:18 -0400 X-Original-Message-id: <001f01cbfcf3$402bdce0$c08396a0$@miller@verizon.net> MIME-version: 1.0 Content-type: multipart/alternative; boundary="----=_NextPart_000_0020_01CBFCD1.B91A3CE0" X-Mailer: Microsoft Office Outlook 12.0 Thread-index: Acv8ldCVKBFBBmOVT7er3opCN7fdSwAXQ29Q Content-language: en-us This is a multi-part message in MIME format. ------=_NextPart_000_0020_01CBFCD1.B91A3CE0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Louis, You=92re not alone in these questions. If answers and comments come to = you directly rather than through LML, please share. =20 Danny Miller N 38=B0 43' 25.7" W 77=B0 30' 38.6" =20 From: Louis Gabriel [mailto:louis@gabriels.us]=20 Sent: Saturday, April 16, 2011 8:24 PM To: lml@lancaironline.net Subject: 360 carbon/racing gear doors =20 First, thanks for being such a great community--I'm brand new to both general aviation and the Lancair game, and I have never encountered a = more patient and willing-to-answer-dumb-questions bunch. I was hoping you = might oblige me once more: I am a new owner of a Lancair 360 Mk II with outback gear...and I've = been plagued with gear door problems. None of these are new or unsolved, but almost every piece of advice on the LML and otherwise (namely n91cz.com) suggests the solution is a set of three-piece, carbon fiber gear doors. Where do they come from? How do I get a set? For some (perhaps unnecessary) background, here are the problems I'm = having: 1. Inner gear door flutter. When the gear is extended, the inner gear = doors move around quite a bit in the prop wash (wearing out the hinge pin). = I've mostly solved this by replacing the flimsy aluminum hinge with stainless steel, but I still have some qualms about the permanence of my solution. 2. High speed buffet. I've found that the trailing edge of my left = inner gear door does not hold very effectively against either the airframe or = the outer door, which above about 180 kts will occasionally start to buffet = and buzz rather alarmingly. After determining this noise was not the = imminent end of my flying career, I found slowing down, cycling the gear (just = enough to reseat the inner doors), then speeding back up solved my problem. = Upon swinging the gear, it's apparent the trailing edge of the inner gear = door is the issue. 3. Drag. Even on the jack stands, there is quite a bit of undercarriage material in the otherwise undisturbed slipstream. Here are my thoughts on potential solutions: 1. To solve the inner gear door flutter issue, I should first minimize = the amount of inner gear door I have. The three-piece carbon set does just that, according to my understanding. I'd like to start there. Second, = I can fiddle around with the hinge system further, but what I would REALLY like to do is sequence the doors to close after the gear is down. I = plan on doing instrument work--it would be nice to be able to drag the gear = whenever I want without thinking about the doors. Has anyone experimented with = this? 2. For the rest of my problems, stiffer, smaller, better-designed doors = are the answer. My only hurdle is acquiring them--and that's where I'm = hoping for your help. Thanks for your time, and I really appreciate your help. I'm glad to be part of the community! Louis Gabriel N61GH, KCVN ------=_NextPart_000_0020_01CBFCD1.B91A3CE0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Louis,<= /p>

You’re = not alone in these questions.=A0 If answers and comments come to you = directly rather than through LML, please = share.

 <= /p>

Danny = Miller

N 38=B0 43' = 25.7"

W 77=B0 30' = 38.6"

 <= /p>

From: Louis = Gabriel [mailto:louis@gabriels.us]
Sent: Saturday, April 16, 2011 = 8:24 PM
To: = lml@lancaironline.net
Subject: 360 carbon/racing gear = doors

 

First, thanks for being such a great = community--I'm brand new to both general aviation and the Lancair game, = and I have never encountered a more patient and = willing-to-answer-dumb-questions bunch.  I was hoping you might = oblige me once more:

I am a new owner of a Lancair 360 Mk II with = outback gear...and I've been plagued with gear door problems.  None = of these are new or unsolved, but almost every piece of advice on the = LML and otherwise (namely n91cz.com) = suggests the solution is a set of three-piece, carbon fiber gear = doors.

Where do they come from?  How do I get a = set?

For some (perhaps unnecessary) background, here are the = problems I'm having:
1. Inner gear door flutter.  When the gear = is extended, the inner gear doors move around quite a bit in the prop = wash (wearing out the hinge pin).  I've mostly solved this by = replacing the flimsy aluminum hinge with stainless steel, but I still = have some qualms about the permanence of my solution.

2. High = speed buffet.  I've found that the trailing edge of my left inner = gear door does not hold very effectively against either the airframe or = the outer door, which above about 180 kts will occasionally start to = buffet and buzz rather alarmingly.  After determining this noise = was not the imminent end of my flying career, I found slowing down, = cycling the gear (just enough to reseat the inner doors), then speeding = back up solved my problem.  Upon swinging the gear, it's apparent = the trailing edge of the inner gear door is the issue.

3. = Drag.  Even on the jack stands, there is quite a bit of = undercarriage material in the otherwise undisturbed = slipstream.

Here are my thoughts on potential solutions:
1. To = solve the inner gear door flutter issue, I should first minimize the = amount of inner gear door I have.  The three-piece carbon set does = just that, according to my understanding.  I'd like to start = there.  Second, I can fiddle around with the hinge system further, = but what I would REALLY like to do is sequence the doors to close after = the gear is down.  I plan on doing instrument work--it would be = nice to be able to drag the gear whenever I want without thinking about = the doors.  Has anyone experimented with this?

2. For the = rest of my problems, stiffer, smaller, better-designed doors are the = answer.  My only hurdle is acquiring them--and that's where I'm = hoping for your help.

Thanks for your time, and I really = appreciate your help.  I'm glad to be part of the = community!

Louis Gabriel
N61GH, = KCVN

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