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 b= ar to hang them, but that might be overkill with your engine already being m= ounted.

Best,

John Barrett

N31V= P

Sent from my iPad

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

Ralf:

I am making up a n= ew set of nose gear doors (don't ask)..

If you f= abricate a new door bracket, please let me know the how and what. And h= ow 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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