X-Virus-Scanned: clean according to Sophos on Logan.com X-Junk-Score: 2 [X] X-SpamCatcher-Score: 2 [X] Return-Path: Received: from mail-oa0-f47.google.com ([209.85.219.47] verified) by logan.com (CommuniGate Pro SMTP 6.0.5) with ESMTPS id 6332041 for lml@lancaironline.net; Tue, 18 Jun 2013 22:10:11 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.219.47; envelope-from=billhogarty@gmail.com Received: by mail-oa0-f47.google.com with SMTP id m1so5841652oag.6 for ; Tue, 18 Jun 2013 19:09:34 -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=9F1EdHkrr0YXge9ZAh3V4Njc9hUgLqIBi3YD7UHbrug=; b=OibHzjp41fY4fH1R04cE3DOHsVAs4a8Ame6XlW+zgpRYPiJJUB2NJ5bmkJw82cI5G3 U1zGXS88HH+Q6zYR+7HodtXLOqadgIS42TXdC1974MowXfIUtM0lAl429CoDkjzJzIhf 6NiDn6e1R/58dJllb+urXfDHX6/QKWHfIF1vge6sbxrthzf4rwpeuqd0Ze9GHo9ZXg37 hD+xCD2GbRLIUk7LabhsegBeaMQO3DzjB+3IRfMUFJvQEHSIJaLu6d9VnL0rF3f+J13B luxHr3zJs9GcOmO/07Eh3jCY29rA7ysUcdoIxY0wLRG0/ii6yxfEN7hSPXRN7yDDMfk5 vWiQ== MIME-Version: 1.0 X-Received: by 10.60.117.41 with SMTP id kb9mr505426oeb.33.1371607774762; Tue, 18 Jun 2013 19:09:34 -0700 (PDT) Received: by 10.182.191.100 with HTTP; Tue, 18 Jun 2013 19:09:34 -0700 (PDT) In-Reply-To: References: Date: Tue, 18 Jun 2013 19:09:34 -0700 Message-ID: Subject: Re: [LML] Re: Nose gear check 4P update From: "William A. Hogarty" To: Lancair Mailing List , Ron , Richard Krentz Content-Type: multipart/alternative; boundary=047d7b414e282f9c2504df7852b7 --047d7b414e282f9c2504df7852b7 Content-Type: text/plain; charset=ISO-8859-1 Hello John: I bought two replacement aluminum doors from Lancair; primarily because aluminum hinges are still in the plane and they have always worked well. Dropping the doors was a simple matter of pulling the hinge pins. I am interested in enlarging the brackets that activate the doors because both of the connecting rods ended up having a slight curve after about 180 hours so there is considerable pressure on those rods. In addition, the right door bracket had a noticeable bend in it that I would like to resolve. If you have any specs on your brackets, I sure would like to see them On Tue, Jun 18, 2013 at 9:32 AM, John Barrett <2thman1@gmail.com> wrote: > Hello Bill. > > i made my nose gear doors out of graphite on my LIVP and used Carbinge to > hinge them. Have about 70 hours on the plane now with no glitches. Very > happy with the results. Can share design parameters if you are interested. > > > I also made graphite angle bar to hang them, but that might be overkill > with your engine already being mounted. > > Best, > John Barrett > N31VP > > Sent from my iPad > > > On Jun 18, 2013, at 8:46 AM, "William A. Hogarty" > wrote: > > 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 >> >> >> > --047d7b414e282f9c2504df7852b7 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Hello John:
=A0
I bought two repl= acement aluminum doors from Lancair;=A0 primarily because aluminum hinges a= re still in the plane and they have always worked well.=A0 Dropping the doo= rs was a simple matter of pulling the hinge pins.
=A0
I am interested in enlarging the brackets that activate = the doors because both of the connecting rods ended up having a slight curv= e after about 180 hours so there is considerable pressure on those rods.=A0= In addition, the right door bracket had a noticeable bend in it that I wou= ld like to resolve.=A0 If you have any specs on your brackets, I sure would= like to see them


On Tue,= Jun 18, 2013 at 9:32 AM, John Barrett <2thman1@gmail.com> w= rote:
Hello Bill. =A0
=

i made my nose gear doors out of graphite on my LIVP an= d used Carbinge to hinge them. =A0Have about 70 hours on the plane now with= no glitches. =A0Very happy with the results. =A0Can share design parameter= s if you are interested. =A0

I also made graphite angle bar to hang them, but that m= ight be overkill with your engine already being mounted.

Best,
John Barrett
N31VP

Sent from my iPa= d


On Jun 18, 2013, at 8:46 AM= , "William A. Hogarty" <billhogarty@gmail.com> wrote:

Ralf:
=A0
I am making up a n= ew set of nose gear doors (don't ask)..
=A0
If you= fabricate a new door bracket, please let me know the how and what.=A0 And = how they 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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