X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 20 Jan 2010 11:18:29 -0500 Message-ID: X-Original-Return-Path: Received: from web36908.mail.mud.yahoo.com ([209.191.85.76] verified) by logan.com (CommuniGate Pro SMTP 5.3.1) with SMTP id 4088940 for lml@lancaironline.net; Wed, 20 Jan 2010 00:49:04 -0500 Received-SPF: none receiver=logan.com; client-ip=209.191.85.76; envelope-from=chris_zavatson@yahoo.com Received: (qmail 72698 invoked by uid 60001); 20 Jan 2010 05:48:28 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=YkuahBIzqOmwq1CW98cbNHU6WRGYt7uqqQNA31mDFzWaA8iiahDB48BBQAShzQUD0r8JgRvcfNTLRUDxKaiXvtojBxTafFb4Bu2Qw6Xh3oW5SkhrZyUaFWn89SSrFRUseZhDJFQ3TTnWwIb5RSN/WbqhLRRjzAkvTownTy6rGjk=; X-Original-Message-ID: <864272.71357.qm@web36908.mail.mud.yahoo.com> X-YMail-OSG: OA7uS4QVM1kkAMCoicxw6wLVPL9_QV2TtWriSQUg7iTP0qdCdKO87C0NOPq8ZjLrwiUTOR3IB_nmVaIptWXVRn3qqtIvg0W01vtDRZm5si_HVc0pGKv5q6HL_9wQY45QU5oB7bYLpC0q7qzHcpWrNyWdmTdc1Vs60Odbit3sffInk1hOn7VKVFuZ4qGqAzOQK4w9n1H0hWStJOW8veTDQDC1Tn0CDF1787VBQIYlV0CSsQpcwzQ732jqEyQggbwjBtg9Wgr6Fa8toz94GXshIymnX9o3Xq8qfesGULYXo4ulIAVh4S2Z4iQgcX3lDz5KTXND4fIven9nQMwVwpXNsIHfN6twh8VkG_WoCo.yxtQYwwLKtr6sdl5D6rnO1F_UJaMDqG1xL454XJARs9Nd4ok3eS4Wspc6Sc7f6CNfjXtOcKbDamcvdwy3CnXHgoBY4_QoIqqsRbxNSN1FUpNqrPWTf1tHytGmBbZrIj_2KG9fYJUr_gkG1v6AhGtDSYtZuf.R5cBBSCiDI76UrlpqBXWegNOD916u1GkWbM1nMErjylFAtkdIAvQ7 Received: from [149.32.224.33] by web36908.mail.mud.yahoo.com via HTTP; Tue, 19 Jan 2010 21:48:28 PST X-Mailer: YahooMailRC/272.7 YahooMailWebService/0.8.100.260964 References: X-Original-Date: Tue, 19 Jan 2010 21:48:28 -0800 (PST) From: Chris Zavatson Subject: Re: [LML] Re: AIrcraft video X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-596160849-1263966508=:71357" --0-596160849-1263966508=:71357 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Jerry,=0AI have a write-up (http://www.n91cz.com/Outback-Gear/Outback.htm) = on my website with more detail, but here is the Cliff Notes version.=0AThe = outback gear has two things going against it.=A0 It has=A0pronounced camber= to=A0bump out over=A0the larger wheels=A0while, at the same time,=A0being = structurally=A0much less=A0stiff=A0than the original(http://www.n91cz.com/V= ideoClips/WiggleTest.wmv).=A0 =0AThe local flow over the door exerts a larg= e down force that the structure could not resist.=A0 The doors were simply = twisting under the load.=A0 The net effect was that the trailing edge of th= e door deflected=A0downward as a function of IAS.=A0 I have seen this in ph= otos of many outback installations, but the video gets you in=A0much closer= to the action.=0AThe solution was to go back to a three piece door design.= =A0 In this way the=A0door sections=A0are not cantilevered nearly as much a= nd part of the load is now carried by the gear leg.=A0=A0In addition, the= =A0inner gear door now has a much improved (smaller) moment arm.=A0 Its upw= ard force assisting the middle door is now=A0about twice what it used to be= .=A0I also switched from glass to carbon as much of the middle door hangs w= ell behind the four attach points on the gear leg.=A0 =0AThe impetuous for = the change is that the doors=A0were=A0a source of=A0tremendous drag.=A0 Swi= tching out=A0the first door yielded a 2 kt improvement in cruise speed.=A0 = I have yet to install the second side.=A0 The parts are done, but=A0a hanga= r move has delayed the installation.=0A=0AChris Zavatson=0AN91CZ=0A360std= =0Awww.N91CZ.com=0A=0A=0A=0A________________________________=0AFrom: Jeremy= Fisher =0ATo: lml@lancaironline.net=0ASent: Tue, Janua= ry 19, 2010 4:49:34 PM=0ASubject: [LML] Re: AIrcraft video=0A=0A=0AChris,= =0A=0AThat is quite a change.=A0 Can you please describe how you fixed the = problem, for those of us who are going to face the same issue?=A0 Thanks.= =0A=0AJerry Fisher=0A=0A=0AOn Tue, Jan 19, 2010 at 2:57 PM, Chris Zavatson = wrote:=0A=0AIsaac,=0A>Isn't technology great!=A0= I used a Sony Webbie to investigate and resolve the problem of 'outback' l= anding gear doors on the 360 being pulled open in flight.=0A>It is amazing = what is happening out there that we can't see.=0A>http://www.n91cz.com/Outb= ack-Gear/OriginalDoor1.wmv=0A>and the fix=0A>http://www.n91cz.com/Outback-G= ear/NewDoor1.wmv=0A>=0A>Chris Zavatson=0A>=0A>=0A>=0A>=0A__________________= ______________=0AFrom: Isaac Heizer =0A>To: lml@lanca= ironline.net=0A>Sent: Tue, January 19, 2010 3:19:02 AM=0A>Subject: [LML] AI= rcraft video=0A>=0A>=0A>For anybody interested in videoing what's going on = under and around their aircraft in flight, I suggest helmet mounted cameras= fit the bill perfectly.=A0 In particular, i temporarily mounted a 4oz, ful= ly self-contained & weather-resistant, video camera to my rear tie-down rin= g socket to see what my landing gear is doing.=0A>=0A>The camera can be had= for less than $300, and is the ContourHD from www.vholdr.com=0A>=0A>Sample= video (mine) is at http://www.youtube.com/watch?v=3DsShijby0JQU=0A>=0A>Sho= uld be great to see what gear doors are doing, for instance.=0A>=0A>=0A=0A= =0A=0A --0-596160849-1263966508=:71357 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Jerry,
=0A
I have a write-up (http://www.n91cz.com/Outback-Gear/Outback.h= tm) on my website with more detail, but here is the Cliff Notes version= .
=0A
The outback gear has two things going against it.  It h= as pronounced camber to bump out over the larger wheels = ;while, at the same time, being structurally much less stiff=  than the original(http://www.n91cz.com/VideoClips/WiggleTest.wmv). 
= =0A
The local flow over the door exerts a large down force that the str= ucture could not resist.  The doors were simply twisting under the loa= d.  The net effect was that the trailing edge of the door deflected&nb= sp;downward as a function of IAS.  I have seen this in photos of many = outback installations, but the video gets you in much closer to the ac= tion.
The solution was to go back to a three piece door design.  In= this way the door sections are not cantilevered nearly as much a= nd part of the load is now carried by the gear leg.  In addition,= the inner gear door now has a much improved (smaller) moment arm.&nbs= p; Its upward force assisting the middle door is now about twice what = it used to be. I also switched from glass to carbon as much of the mid= dle door hangs well behind the four attach points on the gear leg.  =0A
The impetuous for the change is that the doors were a= source of tremendous drag.  Switching out the first door yi= elded a 2 kt improvement in cruise speed.  I have yet to install the s= econd side.  The parts are done, but a hangar move has delayed th= e installation.
=0A
 
=0A
Chris Zavatson
=0AN91CZ
=0A
360std
=0A=0A

=0A
=0A<= HR SIZE=3D1>=0AFrom: Jeremy= Fisher <jffisher@gmail.com>
= To: lml@lancaironline.net
Subject: [LML] Re: AIrcraft video
=0A
Chris,
=0A
 
=0A
That is quite a change.&nb= sp; Can you please describe how you fixed the problem, for those of us who = are going to face the same issue?  Thanks.
=0A
 
= =0A
Jerry Fisher

=0A
On Tue, Jan 1= 9, 2010 at 2:57 PM, Chris Zavatson <chris_zavatson@yahoo.com> wrote:
= =0A
=0A
=0A
=0A
Isaac,
= =0A
Isn't technology great!  I used a Sony Webbie to investigate a= nd resolve the problem of 'outback' landing gear doors on the 360 being pul= led open in flight.
=0A
It is amazing what is happening out there = that we can't see.
http://www.n91cz.com/Outback-Gear/OriginalDoor1.wmv=0A
and the fix
=0A
http://www.n91cz.com/Outback-Gear/NewD= oor1.wmv
=0A
 
=0A
Chris Zavatson
=0A
 = ;
=0A

=0A
=0A
=0A<= B>From: Isaac Heizer <ijheizer@comcast.net>
To: lml@lancaironline.net
Sent= : Tue, January 19, 2010 3:19:02 AM
Subject: [LML] AIrcraft video

=0A
For anybody in= terested in videoing what's going on under and around their aircraft in fli= ght, I suggest helmet mounted cameras fit the bill perfectly.  In part= icular, i temporarily mounted a 4oz, fully self-contained & weather-res= istant, video camera to my rear tie-down ring socket to see what my landing= gear is doing.

The camera can be had for less than $300, and is the= ContourHD from www.vholdr.com

Sample video (mine) is at http://www.youtu= be.com/watch?v=3DsShijby0JQU

Should be great to see what gear doors = are doing, for instance.

=


=0A=0A=0A=0A --0-596160849-1263966508=:71357--