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

Thu Jan 4 05:14:49 AKST 2007

Ken,
I like to set up up my planes so I do not have to use a duel rate
switch if possible.  When I do set up rate switches I use them as
conditions and place all surfaces rates on one switch.

On the Brio I have more rate left on the elevator and rudder then I
did on the aileron.  I think I am around 90% on low rate with the
ATV at 130.

I have not fine tuned the amount of throw I need for snaps since...

1) I don't know what a good snap looks like
2) I don't understand the affects that each surface has on the snap.
3) I will only need to fly sportsman for now

I hope that some time in the spring or summer I can get don to do a few
more trim flights and test out the snaps to see if I have enogh throw
on the surfaces.

It is hard to adjust your plane when you don't know what you are looking 
at!  ;)

Ken Velez wrote:
>   I have one other question for Kelly. If you set up your servos 
> mechanically to full resolution and the output travel in your control 
> surface is 10 deg. "in this case ailerons" I'm assuming your elevator is in 
> the same vicinity  How do you get enough throw for snaps stalls or spins? 
> Just wondering.
>
> Ken
> ----- Original Message ----- 
> From: "Dave Lockhart" <davel322 at comcast.net>
> To: "'NSRCA Mailing List'" <nsrca-discussion at lists.nsrca.org>
> Sent: Wednesday, January 03, 2007 11:37 PM
> Subject: Re: [NSRCA-discussion] Aileron servo arm size and resolution?
>
>
>   
>> 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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>>>> NSRCA-discussion at lists.nsrca.org
>>>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>>>>
>>>>
>>>>
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>>>>
>>>>
>>>>         
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>>>       
>> -- 
>> ______________________________________________
>>
>> Kelly Regan
>> www.reganbrothers.com
>> Home Page: http://mysite.verizon.net/vze6uror/
>> ______________________________________________
>>
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-- 
______________________________________________

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