X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-oa0-f44.google.com ([209.85.219.44] verified) by logan.com (CommuniGate Pro SMTP 6.0.5) with ESMTPS id 6331017 for lml@lancaironline.net; Tue, 18 Jun 2013 11:47:08 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.219.44; envelope-from=billhogarty@gmail.com Received: by mail-oa0-f44.google.com with SMTP id l10so5269829oag.31 for ; Tue, 18 Jun 2013 08:46:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=taaWW7DQCH+ajhbQHerMvhhCcpKivJCFuHNpXi/yL0Q=; b=Fl8EO8VboC3RcEq8eLz7VqsVvjan3djC/0MQgCcTuiLc6+7Yc2sljvZqbrlMcKYI7e XEL2QyLucd2gb8zw4hXlV/L6ncfMX0KlqHAn+V41HaPGdL1h6EYoNM63hy4m2hxptyKx or6U+EMruBVMdtWwYOrlKC9zdPyGxZcI+f/qnn7BIpKkRhMNBQm1WlNppG+T5M95Qop/ 2BaRou2LA2ZamtxHUZ61Sb4DTYl5KK/JgNevD36dwfscFEw6jeDxDksy5nBvbbUbETfK Q1GEcpDY5oTyFGvqLL72vq7xel3IdoAnJK4szlCtb0uZOFqwEWewLI17T832h+mSrnVo Lw+g== MIME-Version: 1.0 X-Received: by 10.60.44.168 with SMTP id f8mr12702638oem.133.1371570392308; Tue, 18 Jun 2013 08:46:32 -0700 (PDT) Received: by 10.182.191.100 with HTTP; Tue, 18 Jun 2013 08:46:32 -0700 (PDT) In-Reply-To: References: Date: Tue, 18 Jun 2013 08:46:32 -0700 Message-ID: Subject: Re: [LML] Re: Nose gear check 4P update From: "William A. Hogarty" To: Lancair Mailing List Content-Type: multipart/alternative; boundary=001a113343d204a4f204df6f9e1c --001a113343d204a4f204df6f9e1c Content-Type: text/plain; charset=ISO-8859-1 Ralf: I am making up a new set of nose gear doors (don't ask).. If you fabricate a new door bracket, please let me know the how and what. And how they work. (maybe Brent has a pattern??? Appreciate the help. Regards Bill Hogarty On Tue, Jun 18, 2013 at 4:45 AM, Chris Zavatson wrote: > Ralf, > The Outback gear doors on the 320/360 suffered a similar fate. The > original actuation scheme couldn't handle the air loads. A small pressure > differential over a large area generates a lot of force. > Chris > > Chris Zavatson > N91CZ > 360std > www.N91CZ.net > > *From:* "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 gear 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-pressure 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 Regan's improved > nose gear linkage - if yours looks more like mine you probably 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 completely > closed." > > The original factory nose gear door linkage geometry provided too low a > mechanical advantage to keep the doors closed against 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 larger effective > moment arm when the doors are closed. A slight kink in the linkage arms > is required. See pictures attached. > > BTW, Selecting Gear 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 the top cowl and strap the propshaft. > > Regards > Bren Regan > -- > For archives and unsub > http://mail.lancaironline.net:81/lists/lml/List.html > > > --001a113343d204a4f204df6f9e1c Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Ralf:
=A0
I am making up a new se= t of nose gear doors (don't ask)..
=A0
If you fabr= icate a new door bracket, please let me know the how and what.=A0 And how t= hey work. (maybe Brent has a pattern???
=A0
Appreciate the help.
=A0
Regards
=A0
Bill Hogarty
=A0


On Tue, Jun 18, 2013 at 4:45 = AM, Chris Zavatson <chris_zavatson@yahoo.com> wrote:<= br>
Ralf,
The Outback gear doors on th= e 320/360 suffered a similar fate.=A0=A0 The original actuation scheme coul= dn't handle the air loads.=A0 A small pressure differential over a larg= e area generates a lot of force.
Chris
=A0
Chris Zavatson
N91CZ
360std

From: "bronnenmeier@GROBSYS= TEMS.COM" <bronnenmeier@GROBSYSTEMS.COM>
To: lml@lancaironline.net
Sent: Monday, June 17, 2013 11:08 AMSubject: [LML] Nose gear c= heck 4P update

Dear subscribers,

I did the nose gear check as described Ja= ck Morgan and Charlie Kohler
earlier. Everything went very smooth and th= e 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
per= fect. This leads to the conclusion that my door shuts perfect after
take= -off and reopens due to air-pressure like Brent Regan describes
below.
On the in-flight picture you can see how the door gets pushed open. Thi= s
was at a pretty low speed - approx.=A0 140...150 kts indicated - I ass= ume
it will get worse if I go faster.

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

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

Ralf



-----Original Message-----
From: Brent Regan [ma= ilto:brent@rega= ndesigns.com]
Sent: Wednesday, June 12, 2013 11:37 AM
To: Lancai= r 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 loo= ked to me that the nose gear door was not completely
closed."

The original factory nose gear door linkage geometry provided too low a=
mechanical advantage to keep the doors closed against the internal
c= owling 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
t= he nose. Remove the top cowl and strap the propshaft.

Regards
Bre= n Regan
--
For archives and unsub http://mail.lancaironline.n= et:81/lists/lml/List.html



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