[NSRCA-discussion] Pull-pull setups

[Koenig, Tom]

I have used Matt K's Kevlar, ..........its Teflon Coated, works very
well and he used to have it in a number of colours.

 

Matt..you may want to chime in?

 

Tom

 

________________________________

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of J N
Hiller
Sent: Thursday, 24 January 2008 1:43 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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