[NSRCA-discussion] Elev Servo's in the stab Pros vs Cons?

[Jon Lowe]

I concur.  I like DEPS because of the fact that you set contorl surface 
synchronization up once and forget about it, but I hated retrimming the 
airplane significantly every day, and another lesser trim change every 
flight,  because the fuselage expanded and contracted.  I hate setting 
up two elevator servos, but I like the fact that the trim never 
changes.  I also like the fail safe aspect of two servos.  I have a 
friend who has two "free" airplanes in the last year after having two 
different issues with servo linkage or wiring, and he was able to land 
with the remaining servo.

Jon Lowe


-----Original Message-----
From: rcmaster199 at aol.com
To: nsrca-discussion at lists.nsrca.org
Sent: Mon, 20 Aug 2007 11:22 am
Subject: Re: [NSRCA-discussion] Elev Servo's in the stab Pros vs Cons?


Have tried all of the above methods and all have advantages anbd 
disadvantages. My new design will have dual elevator servos in the 
stab. I will use a pair the mini superfast, lightweight JR digitals and 
couple them with 2-56 rods. The length of pushrods will be short

Matt


-----Original Message-----
From: twtaylor <twtaylor at ftc-i.net>
To: nsrca-discussion at lists.nsrca.org
Sent: Mon, 20 Aug 2007 8:47 am
Subject: [NSRCA-discussion] Elev Servo's in the stab Pros vs Cons?




I have a new secret weapon I’m building. Not having built and airplane 
in many years I started looking at what type of elev push rod system to 
use. I’ve looked at the Deps, two servos in the stab, pull pull cables 
and a single push rod with a Y.

 

The pull pull seems to be the lightest and possibly the easiest way to 
go. The twin servo’s also seems easy but adds another servo.  I don’t 
have the small servo’s required so that’s a consideration as well. The 
deps seems to be a good way but possibly the hardest of all to install. 
The old tried and trued Y pushrod is what I’ve used for years and have 
always used a bearing tube where it exits the fuse. This is a composite 
fuse already painted and I’d rather not screw it up by trying to put a 
former for the rear of the pushrod Like Dave has in the Focus.

 

I also am debating using the Tetra push rods for the ailerons even 
though they’re 2/56 push rods. We used to use them on rocket ships of 
the past and I was wondering if they would be fine on this aircraft 
because we fly slower now.

 

Pro’s Con’s?  




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