[NSRCA-discussion] Rudder pull-pull

[Dwayne Brown]

Jim, I see that you flew this morning or last night with my friend Ralph
DePalma.  I've been attempting to get him to buy one of your switches in
that he now uses your regulator.  Dwayne in Amarillo

 

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of James Oddino
Sent: Friday, May 09, 2008 11:46 AM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] Rudder pull-pull

 

If the arm on the servo and the control horn on the rudder are equal lengths
the system is linear.  One degree of servo change results in one degree in
rudder change at all points in the travel from neutral to full throw.  We
don't care how far fore and aft the push rod or cables move to get these
results.

 

Jim O

 

 

On May 9, 2008, at 6:32 AM, Mark Atwood wrote:





Better. But let's not get gaudy about it...lol

The reality is the throw is just more linear.  With an arm, even though the
attachment point of the cable to the arm still moves in a circular fashion
(same as the wheel), the cable is not following the arc.  So the angle of
the cable is changing, and the relative throw is decreasing as the arm is
deflecting.

Can you tell???  Well, it's effectively giving you opposite expo (the arm
is).   Meaning the throw is more sensitive around neutral.    When we used
Analog servos...this was actually a good thing.  The amount of blow back on
our barn door rudders made the first bit of movement somewhat ineffective.
But now with the digital servos which operate at full torque even near
center, my guess is that people running an arm MIGHT...just MIGHT use
slightly more expo on their rudder to offset the mechanical negative expo.
That's if they really notice it.

I just go for the bling. :)

-M


On 5/9/08 9:24 AM, "chris moon" <cjm767driver at hotmail.com> wrote:




I was going to put real diamonds around the edge of the wheel and a neon
light below it...does that count?


Mark Atwood wrote: 



Re: [NSRCA-discussion] Rudder pull-pull You have a problem with Bling??? Go
fly Pylon...you're not worthy of Pattern.
 
:) :) :)
 
 
 
 
On 5/9/08 9:13 AM, "chris moon"  wrote:
 
  



Can someone explain the benefits (real or otherwise) of the pull-pull 
wheel type rudder servo arm vs. a regular servo arm? Is there some real 
benefit, or is it bling?
Thanks
 
Chris
 
 
 

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