REFLECTOR: Moving my roll servo.

[Scott Derrick]

Darrell,

I fly 2 different T210's that have the identical autopilot installation
in them.  One oscillates, one doesn't.  I think its because of a bit of
slop in the linkage from the servo to the trim tabs.  We've had both
autopilots tuned up and it didn't fix the searching/oscillating in the
errant one. If I grab the yoke and hold it for 5 seconds the oscillation
stops for a while. Slight turbulence  seems to set it off.

Scott

Darrell & Nora Kufalk wrote:
> I installed my roll servo behind the keel and attached a control arm to the
> bell crank.  It looks nice but I'm still not sure it's the best location.
> I'm still having a little oscillation tracking any type of heading.  It
> slowly banks back and forth just a few degrees each time.  I think this is
> due to the small slop in the push pull cables.  It also could be due to the
> Blue Mountain control software.  Here's a picture.
>
> Still debugging...
> Darrell
>
>
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
> Behalf Of Scott Derrick
> Sent: Friday, June 12, 2009 9:56 PM
> To: Velocity Aircraft Owners and Builders list
> Subject: REFLECTOR: Moving my roll servo.
>
> Yesterday I was finally re-installing the roll servo, which means that
> the wings are finally back on and it starting to look like a plane
> again! Because the 520 is so close to the firewall, for cg reasons, I
> knew it was going to be tight.  With the IO360 there was a plethora of
> space.
>
> There turned out to be just enough room on the fire wall with a fairly
> straight shot for the linkage arm, maybe 7-8 degrees of slant.  But, the
> proximity of the firewall to the engine makes maintenance and inspection
> a  truly aerospace like experience.  Now that the plenum is on its
> really getting tight back there.
>
> I realized that installing the servo on the firewall in the only spot
> left almost completely  blocked  access  to the accessory case from the
> pilot side. A similar situation would exist on the copilot side.  In
> fact I would have to remove the servo to change the oil filter!  
>
> I played with a couple of ideas about making a quick removal kind of
> mount for the servo but after some thought figured that was a bad idea.
> Last thing I want is to have a major component of the roll control
> system being R&R'd on a regular basis.
>
> I remembered that  somebody had mentioned installing the roll servo
> behind the back seat!  Hmm...   I played with that by setting the servo
> in various places  and realized  that it would work.   I would loose 
> some feet room, but  that back seat  area is the roomiest part of the
> whole airplane.
>
> I found some pictures posted by Doug Holab that showed a nice clean
> installation of the servo in that area. 
>
> Doug,  is that working out?
>
> Anybody else mount their servo in the back seat area?  Have any
> recommendations or gotchas about that?
>
> Another big gain for me in moving it forward is cg. No matter how much I
> move forward I'm sure I'm looking at some dead weight in the nose to get
> the cg where it needs to be.  But any little bit helps and those servos
> are heavy!
>
> Scott  
>   
>
>   
>
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