Hello= John:

Yes, I think that we are talking about the= same item

Each nose gear door is actuated by lin= kage (rods) that attach to the door using a small "L" shaped aluminum&n= bsp;bracket.

It seem that if the bracket were a little larger, the p= ivot point (where the rod attaches) could be moved and thus apply&= nbsp; a little more pressure to hold the doors closed in flight..

Any thoughts???? Bill H.

On Wed, Jun 19, 2013 at 12:29= AM, John Barrett <2thman1@gmail.com> wrote:

Hi again Bill,

Is the bracket you are referring to the horn that the push r= od is attached to?

I'm not quite sure what the bracket is.

John

Sent from my iPad

On Jun 18, 2013, at 7:09 PM, "William A. Hogarty" <billhogarty@gmail.com&g= t; wrote:

Hello John:

I bought two replacement aluminum doors from Lanca= ir; primarily because aluminum hinges are still in the plane and they h= ave always worked well. Dropping the doors was a simple matter of pull= ing the hinge pins.

I am interested in enlarging the brackets that activat= e the doors because both of the connecting rods ended up having a slight cur= ve after about 180 hours so there is considerable pressure on those rods.&nb= sp; In addition, the right door bracket had a noticeable bend in it that I w= ould like to resolve. If you have any specs on your brackets, I sure w= ould like to see them

On Tue, J= un 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 hi= nge them. Have about 70 hours on the plane now with no glitches. = ;Very happy with the results. Can share design parameters if you are i= nterested.

I also made graphite angle bar to hang them, but that mi= ght 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. H= ogarty" <billh= ogarty@gmail.com> 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. An= d how they work. (maybe Brent has a pattern???

Appreciate the help.

Regard= s

Bill Hogarty

On Tue, Jun 18, 2013= at 4:45 AM, Chris Zavatson <chris_zavatson@yahoo.com> w= rote:

Ralf,

The Outback gear doors on the 3= 20/360 suffered a similar fate. The original actuation scheme co= uldn't handle the air loads. A small pressure differential over a larg= e area generates a lot of force.

Chris

Chris Zavatson

N91CZ

360std

www.N91CZ.net<= /a>

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

Dear subscribers,

I did the nose gear check as described Jac= k Morgan and Charlie Kohler
earlier. Everything went very smooth and the p= lane 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
perf= ect. This leads to the conclusion that my door shuts perfect after
take-o= ff 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 as= sume
it will get worse if I go faster.

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

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

Ralf

-----Original Message-----
From: Brent Regan [mai= lto:brent@regand= esigns.com]
Sent: Wednesday, June 12, 2013 11:37 AM
To: Lancair M= ailing List
Subject: Re: Nose gear check 4P

Ralf writes:
"A friend took a pict= ure of the belly of my airplane in flight with the
gear up. It looked to m= e that the nose gear door was not completely
closed."

The original factory nose gear door linkage geometry provided too low a<= br>mechanical advantage to keep the doors closed against the internal
cow= ling 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 large= r effective
moment arm when the doors are closed. A slight kink in the li= nkage 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
th= e nose. Remove the top cowl and strap the propshaft.

Regards
Bren R= egan
--
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