ORIGINAL: rlipsett
i picked up the programmer for 20 bucks on ebay. The price of the servos are insignificant to all the the other prices you are spending on the aircraft. How big is the model if it needs between 2 or three servos to operate a rudder. once properly program and setup right you do not get any appreciable current drains along the entire movement
Depends on a couple things. Not all servos are the same. Some are better then others but I have never seen two servos track the same. They are always a couple degrees off. The mechanical setup of the control horns have to be spot on as well. The mix used or the matching device can affect the servo track as well. The best you could do with a push pull setup in the tail is to use a multi point mix.
The reason to go with 2 servos rather then 3 is to reduce the complexity. Ihave set up 3 and 4 servo rudder trays with matchboxes, equalizers, programmers and power expanders and no matter how much time I spend I simply cant get them to draw less then 1.5 amps at some point of rotation. The fewer servos mean less binding.