Extreme Flight 110" YAK-54 V2, Assembly Manual

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Figure 3.
Now is the time to decide if you will run 2 or 3 aileron servos. If you are running
servos that have at least 400oz inches of torque, two should be sufficient. We
chose the MKS777HV for our ailerons. You can always add the middle aileron
servo later if you find it necessary. We will describe how to install a 2 servo
operation. Find the inner most slots in the aileron for the control horns. They are
approximately 5.25” from the root of the aileron measured along the hinge line.
See figure 4. The outer aileron horn slot is 7.5” from the tip, see figure 5.
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