[NSRCA-discussion] Rudder pull-pull

[James Oddino]

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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