[NSRCA-discussion] Aileron servo arm size and resolution?
vicenterc at comcast.net
vicenterc at comcast.net
Thu Jan 4 06:54:46 AKST 2007
Kelly,
I understood that you are flying Sportsman. Therefore, don't worry about snaps and spins. You will learn to set the plane for those maneuvers later.
Vicente "Vince" Bortone
-------------- Original message --------------
From: Kelly Regan <kelly.regan2 at verizon.net>
> Dave and Fred,
>
> Just a little more info on how I try and set up the planes...
>
> I always adjust the linkages so I have near zero sub trim and 0
> radio trim. I always try to give the servo's the best mechanical
> advantage possible and still get the throw I need.
>
> I have read the trimming guide published by Peter Goldsmith in the
> AMA mag last year and try to follow that when setting up my planes.
>
> I was at almost the full servo throw - 45 degree's on the ailerons. If
> I go to the outside hole of the round wheel that should give me aprox.
> 35 degree rotation in each direction. that will give me some room
> for a higher rate condition for snap, spins if I need it.
>
>
>
> Dave Lockhart wrote:
> > 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"
> >> To:
> >> 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/
> >>> ______________________________________________
> >>>
> >>> _______________________________________________
> >>> NSRCA-discussion mailing list
> >>> 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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> NSRCA-discussion at lists.nsrca.org
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
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