How does that work? I assume you have to have twin elevator horns. True? Apparently on some RC airplanes, one has the option of installing single or twin elevator servos. thx. Jim
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Typically, you will have 2 control horns, one on each elevator half.

Again true. If you are going to use one servo on the elevator, the push rod is typically a "Y" setup and the servo is usually mounted near the front of the plane.

MANY setups that use 2 elevator servos have the servos mounted in the rear of the plane and use short pushrods. The servos either use a "Reversing Y" connector OR have one servo 180 degrees from the other servo (for instance, the output shaft on one servo is near the tail and the other servo has the output shaft further away from the tail )