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Keith,
<br>I'm using a little different system on my current, under construction,
ship than anything I've tried in the past. I've used pull-pull on elevator
in the past, and I like it, but you can still get trim changes with temp
changes as the fuse swells and contracts.What I'm trying this time is to
locate the elevator servo just ahead of the stab. I then mount a piece
of Dave Brown arrow shaft about a foot long running back to the elevators
with a bushing at EACH end with Y-rods exiting the fuse to each elev half.
I offset the servo to one side of the fuse so that the end of the output
arm is roughly in the center of the fuse.I connect the servo output arm
to the drive end of the pushrod with about a 2&1/2" threaded end rod
for adjustment.Being poor I use Rocket City clevises which gives me additional
adjustment as well as zero slop.As you can see all links are very short
guaranteeing that any trim changes will be miniscule.
<br>With the arrow shaft supported at BOTH ends there can be no side-to-side
movement assuring equal travel to each elev half.Also the parts are all
so small that the total weight of the system rivals the best pull-pull
set-up.I also installed the rudder servo at the same location and I will
use pull-pull on that.I can get away with this rearward installation as
my stab, on this airplane only weighs 1.8 oz.
<br>You might have to throw the battery pak against the firewall, but I
thought this might be another option you might want to consider or a modification
thereof.
<br>The rod bearings are nothing more than a couple of short pieces of
brass tubing so that the system is lighter and less complex than a bell-crank
unit.
<br>Whatever you go with, good luck.
<br>Georgie
<p>Keith Black wrote:
<blockquote TYPE=CITE><style></style>
<font face="Arial"><font size=-1>I'm
in the process of building a new Aries and am trying to decide whether
to use pull-pull or a push-rod on the elevator. I'd like to hear some opinions
on which is the best way to go. I plan to go with pull-pull on the rudder,
but I'm undecided on the elevator.</font></font> <font face="Arial"><font size=-1>The
Aries requires no formers so there would be no problem with space in installing
a pull-pull system for the elevator, however I know there are different
theories as to which is the best approach. If you have an opinion please
explain why you feel the way you do (weight, control accuracy, reliability,
etc.).</font></font> <font face="Arial"><font size=-1>For those push-rod
proponents I'd be very interested in hearing your opinion on the best approach
to installing a push rod system. For example using a "Y" push rod with
bushings, using an bell crank, etc.</font></font> <font face="Arial"><font size=-1>I
look forward to hearing everyone's opinion.</font></font> <font face="Arial"><font size=-1>Thanks,Keith
Black</font></font></blockquote>
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