[NSRCA-discussion] Aileron servo arm size and resolution?

[Dave Lockhart]

Kelly,

Without going into default and max/min values for each parameter for each
brand radio, endpoints, ATV, AFR, dual rates, mixers (built in, or Pmixes,
or differential mixes), and trim all have an effect on the amount of servo
travel.  You will have max servo resolution when the servo moves through the
full range of available travel (typically 90 degrees, 45 degrees each
direction).

The setup is a compromise between "speed" and resolution.  Move the linkage
out on the servo and reset the servo throw to yield the same control surface
deflection, and the resolution has gone down and the time needed for the
control surface to reach max deflection has also gone down.

So, if your flying rates have 45 degrees of servo rotation in each
direction, you are at max resolution.  In practice, if your servos are
moving 30-35 degrees in each direction, you will be in pretty good shape,
and you have some servo throw "leftover" to accommodate trim, sub trims, and
mixers.

Dave 

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Kelly Regan
Sent: Wednesday, January 03, 2007 10:27 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Aileron servo arm size and resolution?

I forgot to add that I am running 6.0 volts with a
7.2 volt li-ion pack and Fromco regulator.

Fred, can you explain or give me an example of what you
mean by bad control system?

I have been trying to understand the affects of high atv's and resolution
for a long time and the information I find is conflicting.

At what point do you realize full resolution?  100% ATV and 100%
on the duel rate screen?   Is there an advantage in going to 130% ATV
as far as resolution is concerned?

 

> You should get your full surface travel (high rate) as close to 100% ATV 
> setting as possible.  ATV is a trap and if abused can lead to some really 
> bad control system installations.
>
> FHH
> ----- Original Message ----- 
> From: "Kelly Regan" <kelly.regan2 at verizon.net>
> To: <NSRCA-discussion at lists.nsrca.org>
> Sent: Wednesday, January 03, 2007 8:14 PM
> Subject: [NSRCA-discussion] Aileron servo arm size and resolution?
>
>
>   
>> What length servo arms do you run on the ailerons?
>>
>> Why do I ask....
>>
>> When I first set up my Brio with the 9411 sa's on the ailerons
>> I wanted to make sure I had full servo/radio resolution.
>>
>> I fly with a Futaba 9C and have CHP control arms on the ailerons.
>>
>> I set my ATV or End Point in the 9C to 130.  I used a standard JR
>> servo wheel with the linkage set to the inner most hole.  In order to
>> get the 1/2" aileron travel per the Brio manual I ended up with 120%
>> duel rate.  It was my understanding that this is exactly what I wanted.
>> High ATV and high duel rate for full resolution?
>>
>> When Don flew my plane he said the aileron servo's seemed slow
>> to him?  He was surprised to hear I had 9411sa's.    He suggested
>> that I use longer servo arms and reduce the ATV to 100% to make
>> the to keep the throw at 1/2" while increasing the surface speed.
>>
>> Tonight I installed the shortest Dubro arms with the linkage on the inner
>> most hole.   That put the numbers at 100% ATV but I had to reduce
>> the duel rate way down to 50% to get the same 1/2" throw.
>>
>> Am I wrong in assuming that cuts my resolution in half?
>>
>> I wanted to get you opinions on since I am now totally confused.
>>
>> What does a faster aileron speed do for me versus the loss of resolution?
>> What is an acceptable loss in resolution to gain the speed?
>>
>> Thanks for you help
>>
>> -- 
>> ______________________________________________
>>
>> Kelly Regan
>> www.reganbrothers.com
>> Home Page: http://mysite.verizon.net/vze6uror/
>> ______________________________________________
>>
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>>
>>
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>
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-- 
______________________________________________

Kelly Regan
www.reganbrothers.com
Home Page: http://mysite.verizon.net/vze6uror/
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