Will,
The 3:2 is to give the servo a bit more more throw. The pitch tube only
moves about 1.25 inches which translates to a very small movement of the
pitch servo arm.
On the pitch servo in the rear, it takes a fairly high block or bridge.
Just make it robust enough. It=99s dimensions escape me as it
varies by servo. Depending on your servo choice and orientation, some
fiddling is required to get it fairly level and yet clear the main tube
and above all, be serviceable.
Just make sure the servo can never jam the flight control and is
robustly attached to the airframe.
Regards.
Bud Yerly
From: William Daniell
Sent: Tuesday, November 17, 2015 9:45 AM
Subject: Re: Europa-List: Re: Autopilot Servos
Bud
thanks
sorry I didnt reply...on the road.
Is there any reason for the 3:2 arm on option no2 for the pitch servo.
Would it be possible just to build a "bridge" over the rudder wires to
bring the servo up to the right level?
Will
William Daniell
LONGPORT
+57 310 295 0744
On Mon, Nov 9, 2015 at 10:30 PM, Bud Yerly <budyerly@msn.com> wrote:
Will,
I=99m to blame for the install of servos under the passengers
feet. I did this in 1999 on 419PL when I started building it. I
don=99t do this any longer as taller passengers tended to dislike
this loss of foot room as it puts their knees higher than comfortable
while flying along. OK for those who fly with their feet on the rudder
pedals or are a standard sized 5=99 10=9D. Also, these are
heavy servos (Navaid, Blue Mountain, etc.) and weigh about 5 pounds. If
you put the battery in the front, watch the weight in the cockpit.
Strive for the 60-61 inch empty weight CG. You=99ll have to keep
the panel light. These are very long servos also, so in a crash, just
unscrew it and it makes an excellent club for survival.
This setup under the feet also is a bit tough with the Garmin, Dynon,
TruTrack and GRT servos. These light weight servos (about 2.5 pounds)
are very good also, plus they have a smaller footprint, but they are
taller. Reducing the foot well even more.
Here are two other ideas I have used for quite some time.
1st is a design I made to put the servo behind the baggage bay. See
the drawing. It is dumb simple. It is a 3 to 2 arm on a bearing and
two push rods so as to allow the servo to move about 45 degrees. Bob
Berube and I consulted on this and I have made it my standard for
retrofits where the only place to put the servo is behind the baggage
bay. It can be installed after the top is on in a finished airplane by
access through the D panel. It is not comfortable.
In all my aircraft, the roll servo goes under the pax seat. Make a
simple metal plate of .060 aluminum and four nut plates to the face of
the inboard seat hole. Attach the servo to it. Make an arm and
attachment bracket for the stick. Fab a fiberglass cover to prevent the
pax from impacting the arm.
2nd is a simple extension to the stab tube attachment point and hook
up. Pretty simple, easy to bolt up if your plane has access panels
which are positioned properly. I always have three access holes.
A 4 inch sight hole for the MAC trim servo, a 6 inch abeam the mass
balance arm as in the book. I then put on the port side a single 6 inch
to access below the pitch push rod to stab tube attachment. If you have
those small Europa mandated sized holes for drug addicted anorexic
maintainers, this may be painful to try unless installed during the
build and access holes are well planned.
Always plan your servos so they cannot go over center and jam the
controls. Many servos come with limit arms to prevent this, use them.
The limit arms typically allow 45 degrees of movement max. Why use 45
degrees or close to that is to allow the servo to have a larger movement
as the clutches and servo settings do not work well when the servo is
limited to a full throw of less than 30 degrees.
I have better drawings in my archives, but it will be a while to get
them as my servo was hit by lightning and fried so it needs to have its
hard drive recovered.
Just a thought as legroom in the Europa is at a premium.
Regards,
Bud Yerly
Custom Flight Creations, Inc.
From: William Daniell
Sent: Monday, November 09, 2015 4:05 PM
To: europa-list@matronics.com
Subject: Re: Europa-List: Re: Autopilot Servos
Excellent thanks.
Will
On Nov 6, 2015 1:16 PM, "Alfred Buess" <ykibuess@bluewin.ch> wrote:
<ykibuess@bluewin.ch>
William,
Attached is a picture of the Navaid Autopilot servo mounted on the
passenger side footwell of my Europa. Pretty simple installation.
Regards, Alfred
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=448888#448888
Attachments:
http://forums.matronics.com//files/navaid_servo_151.jpg
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