Why is it preferable to use two separate channels when utilizing two separate elevator servos? Why is it better than using a MPI Miracle Y. I know how to and have used separate channels for each elevator servo but don’t understand why it is the preferred method. I feel it should not be the preferred method simply because two servos in two separate channels will not run at the same speed due to the slight difference in the signal getting to the servo.

RCP,
In general 2 servos in 2 channels is preferable because of the adjustability -- adjusting the end points, etc.

Never having used the miracle Y i can't say how it performs or if it picks up the difference.

The lag between channels with standard servos is almost unnoticable, but it does exist. With digitals, the 9Z WC2 has an accelerated frame rate which resolves that to the point of being unperceptible, but nothing else i know of on the planet does.

So the answer is, standard Y harnesses are far from perfect, and so the norm has become two channels. Also a y-harness is one more piece of equipment to put drag on the system and to have potential to disconnect or fail.

AnnMarie

An MPI Miracle Y is a connector that allows you to adjust one servo neutral point so that it matches the other servo. It also reverses one of the servo directions. With this device I can not see any difference between the two servos.

Unfortunately I do not own a 9Z. My talents just don’t warrant that type of investment in a transmitter. I have wired several airplanes using two separate channels, using both the 8U and the new 9C which is the radio I’m using. I feel it is very easy to see the difference between the two servos when they are put into two channels using either of these transmitters. Maybe I’m being too critical and it really does not matter if one half of the elevator is slightly slower than the other. Does it really matter? What does this condition cause?

Mike,
the difference should be minimal...and modelers have been flying, not even recognizing it existed, since computer radios surfaced....yes, you can see a very slight lag on the bench, but it has minimal effect in flight, under load, etc.

Thanks for taking the time to answer my question and being here on this BBS. You have helped me once before via the telephone right before the new 9C was released concerning another matter. You were the main influence on my decision for purchasing the 9C. It is a great transmitter. Again, thanks for all the help you have been.

Mike,
Thanks for the kind words! Happy to assist!