X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 18 Jun 2013 07:45:49 -0400 Message-ID: X-Original-Return-Path: Received: from nm43-vm4.bullet.mail.ne1.yahoo.com ([98.138.120.228] verified) by logan.com (CommuniGate Pro SMTP 6.0.5) with ESMTPS id 6329883 for lml@lancaironline.net; Mon, 17 Jun 2013 18:47:07 -0400 Received-SPF: none receiver=logan.com; client-ip=98.138.120.228; envelope-from=chris_zavatson@yahoo.com Received: from [98.138.90.52] by nm43.bullet.mail.ne1.yahoo.com with NNFMP; 17 Jun 2013 22:46:31 -0000 Received: from [98.138.226.165] by tm5.bullet.mail.ne1.yahoo.com with NNFMP; 17 Jun 2013 22:46:31 -0000 Received: from [127.0.0.1] by omp1066.mail.ne1.yahoo.com with NNFMP; 17 Jun 2013 22:46:31 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 225573.53997.bm@omp1066.mail.ne1.yahoo.com Received: (qmail 76934 invoked by uid 60001); 17 Jun 2013 22:46:31 -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:In-Reply-To:MIME-Version:Content-Type; b=0CX2PYui6FtqtonssRzTAe9kpBM0Vk/vtfLn+EzrntMwQx50wW59+9q34wFLFur1euEkM7R1eJAr638kTwBKr+ekBu0teXII512Hup4gpX6Ll/Tf4RHPkx/q82/yHRzCJEAVGG4b/iKWtuxRfJpIud/hgFvmjPR6a/AfILbctSA=; X-YMail-OSG: Brv1Vg4VM1kJVVri8qniESkWvdn.SKYDK9nV_CLhuwwxmld tpZ.BCxb.yDR3AE46HJnmApsi4tLzRxDttC8kibDTTTr7Te9FhdrRTxW0wcX 5ye8suqznRIJXvsfKAkE.JYy5tydVz0Vw8ynbrm.ZRVCOwNqF7_XTRuFtN6H 0m7aBe0DMRXScFqG5zbbw0Z_ldqnRlC.rAVlgSYFfohp0aXVZp1meZf8TQum 4IyI9mWIOWDrT8jDi1dRSDY9MdW23DUD.mFW_q5pkhKMFf11yoP__iYEmUTq TgXO415aHcZEPFoPfw_oReQvQpL_ZnBGzo6ackxFH_AtxxXqWuYX2Q4jX41B wGCgciew.JVEOYQ4iZdaEARAQY9LU_8IEw7h4B5h.j_YWJI41KRgAa_q8HjN _AFq8Z1BW0Bv3rbicicr39yg6hW15A77f51.EtXnA2Ez2ePelNhGlSpIRN0p sPnN_LVVm8mk7W2aNiQEiWpcPMIR3emwFyLeyy788jM9OyAb8czAuhO5Y65D P_lvaHbCnOIKyew2tJ3eizKx6B3LqcWChBR7X0RDVTjMZOCc4Rk0oZB_iCC0 6_U9Hq1CY4OtjSTgVxm.Qt2rePPNwOh.u8sYTmMm_FFW2KgMaJhai7w-- Received: from [172.14.16.72] by web121605.mail.ne1.yahoo.com via HTTP; Mon, 17 Jun 2013 15:46:30 PDT X-Rocket-MIMEInfo: 002.001,UmFsZiwKVGhlIE91dGJhY2sgZ2VhciBkb29ycyBvbiB0aGUgMzIwLzM2MCBzdWZmZXJlZCBhIHNpbWlsYXIgZmF0ZS7CoMKgIFRoZSBvcmlnaW5hbCBhY3R1YXRpb24gc2NoZW1lIGNvdWxkbid0IGhhbmRsZSB0aGUgYWlyIGxvYWRzLsKgIEEgc21hbGwgcHJlc3N1cmUgZGlmZmVyZW50aWFsIG92ZXIgYSBsYXJnZSBhcmVhIGdlbmVyYXRlcyBhIGxvdCBvZiBmb3JjZS4KQ2hyaXMKwqAKQ2hyaXMgWmF2YXRzb24KTjkxQ1oKMzYwc3RkCnd3dy5OOTFDWi5uZXQKCkZyb206ICJicm9ubmVubWVpZXJAR1JPQlNZU1QBMAEBAQE- X-Mailer: YahooMailWebService/0.8.147.553 References: X-Original-Message-ID: <1371509190.76703.YahooMailNeo@web121605.mail.ne1.yahoo.com> X-Original-Date: Mon, 17 Jun 2013 15:46:30 -0700 (PDT) From: Chris Zavatson Reply-To: Chris Zavatson Subject: Re: [LML] Nose gear check 4P update X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="2053635335-20063907-1371509190=:76703" --2053635335-20063907-1371509190=:76703 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Ralf,=0AThe Outback gear doors on the 320/360 suffered a similar fate.=A0= =A0 The original actuation scheme couldn't handle the air loads.=A0 A small= pressure differential over a large area generates a lot of force.=0AChris= =0A=A0=0AChris Zavatson=0AN91CZ=0A360std=0Awww.N91CZ.net=0A=0AFrom: "bronne= nmeier@GROBSYSTEMS.COM" =0ATo: lml@lancaironl= ine.net =0ASent: Monday, June 17, 2013 11:08 AM=0ASubject: [LML] Nose gear = check 4P update=0A=0A=0ADear subscribers,=0A=0AI did the nose gear check as= described Jack Morgan and Charlie Kohler=0Aearlier. Everything went very s= mooth and the plane did not move at all=0Aeven when the weight on the tail = and chucks were removed.=0A=0AI cycled the gear 5 times and every time the = nose gear door shut=0Aperfect. This leads to the conclusion that my door sh= uts perfect after=0Atake-off and reopens due to air-pressure like Brent Reg= an describes=0Abelow.=0A=0AOn the in-flight picture you can see how the doo= r gets pushed open. This=0Awas at a pretty low speed - approx.=A0 140...150= kts indicated - I assume=0Ait will get worse if I go faster.=0A=0AI attach= ed pics of my nose gear linkage versus Brent Regan's improved=0Anose gear l= inkage - if yours looks more like mine you probably have the=0Asame problem= .=0A=0ASince there was so much concern about my jacks I attached a pic of t= he=0Agear check. My jacks work reliable and the plane sits sound on them.= =0AThey just don't have enough stroke. That's why I have little platforms= =0Athat I slide in and out. The set up works reliable - it is just a little= =0Amore work.... =0A=0ARalf=0A=0A=0A=0A-----Original Message-----=0AFrom: B= rent Regan [mailto:brent@regandesigns.com] =0ASent: Wednesday, June 12, 201= 3 11:37 AM=0ATo: Lancair Mailing List=0ASubject: Re: Nose gear check 4P=0A= =0ARalf writes:=0A"A friend took a picture of the belly of my airplane in f= light with the=0Agear up. It looked to me that the nose gear door was not c= ompletely=0Aclosed."=0A=0AThe original factory nose gear door linkage geome= try provided too low a=0Amechanical advantage to keep the doors closed agai= nst the internal=0Acowling air pressure during flight. On the door bracket,= you need to=0Afabricate a new part with the link ball hole rotated about t= he hinge=0Acenterline towards the AC center. This will give a larger effect= ive=0Amoment arm when the doors are closed. A slight kink in the linkage ar= ms=0Ais required. See pictures attached.=0A=0ABTW, Selecting Gear Up while = on the wheels is an incredibly bad idea. =0ABuy a decent pair of jacks NOW.= Also, do NOT strap the spinner to lift=0Athe nose. Remove the top cowl and= strap the propshaft.=0A=0ARegards=0ABren Regan=0A--=0AFor archives and uns= ub http://mail.lancaironline.net:81/lists/lml/List.html --2053635335-20063907-1371509190=:76703 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Ralf,
The Outback gear doors on the 320/360 su= ffered a similar fate.   The original actuation scheme couldn't h= andle the air loads.  A small pressure differential over a large area = generates a lot of force.
Chris
 
Chris Zavatson
N91CZ
360std

From: "bronnenmeier@GROBSYSTEMS.COM" <= bronnenmeier@GROBSYSTEMS.COM>
To= : lml@lancaironline.net
Sent: Monday, June 17, 2013 11:08 AM
Subject: [LML] Nose gear check 4P update

Dear subscribers,

I did the nose ge= ar check as described Jack Morgan and Charlie Kohler
earlier. Everything= went very smooth and the plane did not move at all
even when the weight= on the tail and chucks were removed.

I cycled the gear 5 times and = every time the nose gear door shut
perfect. This leads to the conclusion= that my door shuts perfect after
take-off and reopens due to air-pressu= re like Brent Regan describes
below.

On the in-flight picture you= can see how the door gets pushed open. This
was at a pretty low speed -= approx.  140...150 kts indicated - I assume
it will get worse if I= go faster.

I attached pics of my nose gear linkage versus Brent Reg= an's improved
nose gear linkage - if yours looks more like mine you prob= ably have the
same problem.

Since there was so much concern about= my jacks I attached a pic of the
gear check. My jacks work reliable and the plane sits sound on them.
They just don't have enough = stroke. That's why I have little platforms
that I slide in and out. The = set up works reliable - it is just a little
more work....

Ralf


-----Original Message-----
From: Brent Regan [mailto:brent@regandesigns.com]
Sent: Wednesday, June 12, 2013 11:37 AM=
To: Lancair Mailing List
Subject: Re: Nose gear check 4P

Ralf= writes:
"A friend took a picture of the belly of my airplane in flight = with the
gear up. It looked to me that the nose gear door was not comple= tely
closed."

The original factory nose gear door linkage geometr= y provided too low a
mechanical advantage to keep the doors closed again= st the internal
cowling air pressure during flight. On the door bracket,= you need to
fabricate a new part with the link ball hole rotated about the hinge
centerline towards the AC center. This will give a larg= er effective
moment arm when the doors are closed. A slight kink in the = linkage arms
is required. See pictures attached.

BTW, Selecting G= ear Up while on the wheels is an incredibly bad idea.
Buy a decent pair= of jacks NOW. Also, do NOT strap the spinner to lift
the nose. Remove t= he top cowl and strap the propshaft.

Regards
Bren Regan
--
= For archives and unsub http://mail.lancaironline.net:81/lists/lml/Lis= t.html


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