CTE

[David Harmon]

Very nice Keith..well done!
 
Regards

Dave Harmon
NSRCA 586
K6XYZ at comcast.net
Torrance, Ca. 
-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of Keith Black
Sent: Tuesday, November 25, 2003 5:27 PM
To: discussion at nsrca.org
Subject: Re: CTE
 
I'm using servos in my stab on my current Aries and what you've just
pointed out is really the only concern I have about the setup. Since the
servo is buried in the stab the control arm must be at least a certain
length to extend out far enough to attach the push-rod and not bump into
the base of the stab. The result is that this ends up creating too much
throw at the servo arm and thus you're not using 100% of your servo
range in moving the elevator. I've already got the control horn position
as far out as it can go but I still only use about 65% to 70% of my
servo travel.
 
That being said, I really haven't noticed it being to sensitive or not
enough granularity in the elevator control and I have not observed any
problems with the elevator halves throwing unevenly. I have just over
100 flights on the plane. I've had several other pattern pilots fly my
plane (even recently), from Advanced to FAI, and everyone seems to think
it flies very true and straight. 
 
Now, after that glowing endorsement I must tell you that on the new
plane I'm building I plan on using pull-pull on the elevator. Why? Ease
of setup and to see if I notice any differences.
 
Here's a link to a picture of my stab with the servo embedded. The servo
is the JR DS3421 mini digital, it's an awesome servo for this
application. 
 
http://www.fototime.com/E1B3341FEB6EA82/standard.jpg 
 
Keith Black
----- Original Message ----- 
From: Alan Simmonds <mailto:alan at gspceilings.com>  
To: discussion at nsrca.org 
Sent: Tuesday, November 25, 2003 6:50 PM
Subject: RE: CTE
 
<My current thinking is that I will still mount the servo in the same
area and go with cables.Very light and direct.>  
 
Georgie
I am also deliberating whether to use stab mounted elevator servos on my
next model but I'm curious about how the geometry would work on a closed
loop setup and still use a good proportion of the servo rotation.  Any
thoughts?
Alan
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