Guys, I am working on my IMAC plane, but this question
is valid for pattern as well. The question is about
radio/system resolution.

After setting up a surface to travel thru its entire distance using 140%
ATV (end point adjustment on the 9C screen), does reducing that
travel by DUAL RATES reduce the system resolution, or does it
only reduce travel?

Example:
Elevator servo...
End points set to 140 in both directions.
High rate set to 140% = 32 Degree's of movement up and down.
Low rate set to 65% = 15 degree's of movement up and down.

In the above example do I loose system resolution
on the Low rate setting?

Radio is a 9CAPSuper.

Thank you for the help.

You do lose resolution on your low rate in the sense that you could have more resolution if you wanted it. However, you would then have to get rid of your high rate. As long as your setup is configured so you get the most throw you use out of 140% ATV (and no more) there is no way to get any more resolution than that.

Interesting Question, So the only way to gain resolution on low rates would be to shorten the geometry/shorter arms? IE. 140%= 15 degrees movement.
I think I just answered my own question.

Only other way I can think of would be a 2 speed servo, which would just add weight and something else to go wrong.

Thank you for the confirmation.... I had one reply in the Giant scale
forum "yes" !

What I wanted to do was see if I can tell the difference with the elevators
set up at 50% DR and now at 80% DR.

What I did was move the control arm from the outside hole on a 1.25"
servo arm to the inner most hole. That gave me .8" just over 3/4" on the
servo.

I then moved out on the control horn from 1.5" to 2" from the hinge line to
the pivot point.

I now have 140% = 20 degree
and 80% = 15 degree

I was shooting for 100% at low rate, but that would require some surgery to
the plane. I am only flying basic IMAC and while I like being able to throw
a switch and play around with 3D I don't want to put myself at a disadvantage
just for the play factor.

I can't wait to fly again so I can see if the change made any difference.

Start with some altitude in your 3D. You may find 20 degrees is not enough throw. It is hard to set up a plane to do both well.

Heheh Not expecting to do any 3D with 20 degree's.

I just want to see if I can feel the difference for precision
flying. If I can, the plane will be set up strictly for precision.
If I can not see or feel a difference I will go back to my
old setup and have a 3D high rate just to for the play factor...
my 3D, or 2-1/2D looks like a sick fish flopping around on
the ground!

where and when you will really see the difference is when the servo pots and gears get worn. As the gears wear the slop created in your old setup will actually be larger deflection of the control surface by 30-40% than the your new higher resolution setup.

On a gasser model they shake like hell and literally eat servos apart. The pots get worn and now the servo has a "deadspot" at the center location. This deadspot and any gear lash (wear) will be exagerated by a mechanical linkage that gives 30-40degs of travel. By reducing from 30+degs to 20degs deflection at max Travel adjust you have increased the resolution (how many degrees of surface travel per % of atv.) or another way is the degrees of surface travel vs the degrees of servo rotation. Basically you have improved your linkage by 30-40% resolution. You may not see it on new servos as much but put 50 flights on them and you will for sure.

Well Futaba seems to think I will not notice a differance?
Time will tell, as soon as my back is feeling better I will go
out and test.

Thanks for everyones help.

>Hi Advent,

>Reducing the travel by Dual rates will not reduce resolution enough
>to see with the naked eye. In fact with the plane in the air, you will
>notice no difference at all.

>I hope you find this information helpful. You can also reach our Futaba
>support technical team at 217-398-8970, or via fax at >217-398-7721.

>Sincerely,
>Krysta Hunt
>Product Development & Support Specialist
>Futaba Service Center USA

quote:

ORIGINAL: Advent

I have a question on system resolution.

After setting up a surface to travel thru its entire distance using 140% ATV
(in the end point adjustment screen), does reducing that travel by
DUAL RATES reduce its resolution?? Or does it only reduce travel.

Example:
Elevator.
End points set to 140 in both directions.
High rate set to 140% = 32 Degree's of movement up and down.
Low rate set to 65% = 15 degree's of movement up and down.

In the above example do I loose system resolution
on the Low rate setting?

Radio is a 9CAPSuper.