[NSRCA-discussion] Pull-pull setups

[Dwayne Brown]

Jim, what at the 2 black "tube" below the elevator dowel?  Where do you get
the double bearings used on the elevator  As said by someone else, NEAT.
Dwayne

 

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of J N Hiller
Sent: Wednesday, January 23, 2008 8:43 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Pull-pull setups

 

I make them from 'G-10' fiberglass sheet available from FTE.
http://www.franktiano.com <http://www.franktiano.com/>  I laminate 3 .03"
thick for to get .09" thick. I pivot them on 1/8 shaft using brass tube
bearing through a 3/8" dowel hub for secure gluing and to prevent flexing of
a long shaft. Here is a photo showing the entire sub-assembly, which I build
and set-up before installation in the fuselage.

Jim

 

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of CHV69 at aol.com
Sent: Wednesday, January 23, 2008 5:09 PM
To: nsrca-discussion at lists.nsrca.org
Subject: Re: [NSRCA-discussion] Pull-pull setups

 

In a message dated 1/23/2008 8:06:14 P.M. Eastern Standard Time,
jnhiller at earthlink.net writes:

John, I can't comment on Kevlar. I have only used steel (.021" Sig control
line cable). I also use internal bell cranks to eliminate cable tension load
on the servo mount rubber grommets and shaft. This way I can run the cables
quite snug. Short ball link connectors connect the bell cranks to the servo.
By using different holes in the servo wheel or bell crank I can use the full
servo travel, and reduce the control surface travel without resorting to
non-parallel linkage or transmitter endpoint and accompanying resolution
reduction.

I haven't been totally happy using dual elevator servos so I cable them as
well, connecting all 4 cables to a single bell crank. It is quite easy to
balance the travel, center and end-points by adjusting the threaded control
horn and cable length. When I started doing this it yielded the tightest
system I ever used.

For what it is worth.

I like that idea for the elevator setup.

What type of bell crank is it that you use?

 

Carl





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