[NSRCA-discussion] Metal Servo Arms

[twtaylor]

Last night I was playing with them, they fit the plastic output gear just
fine. I was trying to get them on 8411sa's with the metal splines. I finally
did but they won't go down as far as a nylon arm. Using a magnifying glass I
could see where the alum arm is fully seated internally. Just looks
different than with the plastic arm, as the arm doesn't cover the entire
part of the splines at the bottom like the standard arm does. I'm using this
on elev with the MK bearing fitting. I'm going to replace the rudder arm
with a H9 as well.

 

Tim

 

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From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of
vicenterc at comcast.net
Sent: Friday, August 31, 2007 9:57 AM
To: NSRCA Mailing List; NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Metal Servo Arms

 

Earl,

 

I wonder if the aluminum single arm will twist more than the round nylon
wheel in similar loads and conditions.  Using MK link (which are very close
to the plane of the wheel) with round nylon wheels has been working very
well for me.  The reason why the nylon wheel is strong is because the
structure is closed.  Of course aluminum wheel would be stronger than nylon
wheel.

 

--
Vicente "Vince" Bortone

 

-------------- Original message -------------- 
From: "Earl Haury" <ejhaury at comcast.net> 

The nylon servo arms are quite adequate when used with a clevis that applies
the force in line with the plane of the arm (typical pin clevis). Pushrod
ends that bolt to one side of the arm move the force off the plane of the
arm and thereby impart a twisting force to the arm. (DuBro type ball links
are the extreme.) Add a bunch of vibration to the normal loads and the nylon
arm may eventually fail - a wheel is a much better choice if one uses the
nylon accessories. In addition to better withstanding the twisting forces of
offset linkage, the aluminum arm is more substantial for screw mounting the
ball / ball bearing end.

 

Jim is correct regarding the H9 arms on JR servos - there seems to be more
variation in the spline of the output than the spline of the arm. (An arm
tight on one servo may fit nicely on another.) OTOH, I've found the H9 arms
to fit Futaba servos consistently well.

 

Earl

----- Original Message ----- 

From: vicenterc at comcast.net 

To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>  ; NSRCA
Mailing List <mailto:nsrca-discussion at lists.nsrca.org>  

Sent: Friday, August 31, 2007 7:28 AM

Subject: Re: [NSRCA-discussion] Metal Servo Arms

 

For pattern I always use the nylon servo arms that comes with the JR servos.
I am not sure why you need the metal servo arms.  Usually I use the round
one for aileron and elevator.  For rudder I use the heavy duty arm that JR
offers (comes in the 8611 servo).  I never have problems with the nylon
servo arms in pattern application.

 

Regards,

--
Vicente "Vince" Bortone

 

-------------- Original message -------------- 
From: Bob Richards <bob at toprudder.com> 

I've used the H9 arms and the SWB arms. No comparison, I will continue to
use the SWB arms.

 

Bob R.



Kelly Regan <kelly.regan2 at verizon.net> wrote:

Not an answer to your question but I find the SWB arms much nicer
since they are split. They use a a 2/56 clamp screw and nylon locking
nut to draw the clamp tight around the spline of the servo shaft.

twtaylor wrote:
>
> I bought some Hanger 9 alum servo arms and when I put them on they are 
> VERY hard to get to pull down on to the servo. Is
>
-- 

________________________________
Kelly Regan
Home Page: www.reganspace.com
________________________________

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