Pull-Pull servos

[Dean Pappas]

Hi Jim,
The JR top post brace is neat, but I've taken to putting a ball-link on top of the servo arm or wheel,
using a long screw in the servo, and then running a short link to the airframe.
Usually it's a short link in compression, attached to the bulkhead behind the servo tray.
That takes the bending load off the servo output shaft. Rudder servo life doubled, instantly.
Sometimes a spacer is needed between the servo arm and the ball link ...
You know those tapered aluminum nuts that come with the DuBro #867 horns?
I turn them down in the lathe to make spacers for this purpose.
Regards,
 

Dean Pappas
Sr. Design Engineer
Kodeos Communications
111 Corporate Blvd.
South Plainfield, N.J. 07080
(908) 222-7817 phone
(908) 222-2392 fax
d.pappas at kodeos.com


-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On Behalf Of Jim Ivey
Sent: Tuesday, November 30, 2004 6:44 PM
To: discussion at nsrca.org
Subject: Pull-Pull servos


Guys
 Another discussion about pull-pull systems. I use pull-pull on the rudder and compared to the elevator servo the rudder servo gets worn and loose at the top bearing much quicker than the elevator servo.The cables are not too tight and are setup correctly so far as ackerman is concerned.The rudder being much bigger than the elevators may cause some of this problem. More momentum...
 I have used the JR top post brace before, but it can't be used with the 8411's without some mods.
 Any input or solutions?

TIA

Jim Ivey

=================================================
To access the email archives for this list, go to
http://lists.f3a.us/pipermail/nsrca-discussion/
To be removed from this list, go to http://www.nsrca.org/discussionA.htm
and follow the instructions.

To access the email archives for this list, go to
http://lists.f3a.us/pipermail/nsrca-discussion/
To be removed from this list, go to http://www.nsrca.org/discussionA.htm
and follow the instructions.