Hi all,
I need your help to use 2 servos in elevator.
I want to know what is the corret mix to use it, and if it´s exist in that radio.
I dont want to use a Y wire, this posibility it´s always possible, but preffer to use a mix.

Thanks.

You can set up a mix to allow two separate channels for dual elevator servos -- but the trim won't work properly -- only one elevator will move in response to the trim.

The newer Optic 6 doesn't have this limitation but if you already have an Eclipse then you'll probably be better off to use a Y-harness for your elevators.

Thanks XJet,
I think that this is a very big problem in a HQ radio like this one, because many radios apparent with less aplications it has this mix included. I can´t undestand it.
I have to use a mix that, for example, in my Airtronics RD6000 has it.[:@][:@][:@]

Thansk a lot.

Don't forget you will have to use a servo reverser also or reverse the linkage but that will cause some geometry problems and give you some differential problems. I have the Eclipse and its a PITA!!

Ron

Why does reversing the linkage create geometry problems? If the exact inverse linkage connections and offsets are in play its all the same is it not?

A simple approach which is more reliable IMO, is to use a reversed servo. Some of the OEM manufacturer's offer a reversed servo or will reverse one for you.

unfortunately, even reversing a servo wont eliminate the problem completely....


when comparing any given servo to it's reversed twin, you will notice that in one direction one of the servos will travel slightly faster and in the opposite direction the other servo will travel a little faster....the only way to solve this problem completely is to have a transmitter that is capable of adjusting this out through programing. ie ,...able to adjust one servo rate against the other.

Would you mind sharing your thoughts on this conundrum?

As I mentioned if all things are equal how is this possible? If one servo is mounted in a different location or plane I would concurr.

i believe the rate at which the motor spins ...clock-wise and counter-clockwise is not linear.

this would cause the phenomenon

That depends on how the motor has been timed.

When using an electric motor for applications such as driving a propellor or the wheels of a car it is normal to time them so they're most powerful/fast when rotating in the desired direction.

However, when using them in an application that requires them to operate in both directions (as is the case with an RC servo) the timing should be set up so that it's neutral for two reasons:

1. the speed will be equal in both directions
2. the torque will be equal in both directions

I've yet to see a servo (Hitec or otherwise) where the engine wasn't set up with neutral timing and as a result I've never observed the difference in speed you talk about.

hitec is making servos with engines? gas or glow?


dave

Yes, where do you think those new TG series get all their torque from -- they've got a small V8 engine inside :-)