I am currently building a Top Flight T-34 and have a question regarding the retracts. I am planning on having sequencing doors. I see the "retract" servos for sale and I want to know when do you use them and what is their advantages? It seems to me that they have a lot of torque, but how much torque do you need to activate a valve? Are they for mechanical retracts or something?

Thanks,
Brian

"Retract" servos are designed for mechanical retracts, have 180 degrees of throw, and actually shut themselves off at either end of the servo movement so there is not a constant drain on the battery.

If you are using a pneumatic retract system most all mini servos will provide the torque needed to operate the valve.

Pete</p>