I am not sure on servos for this stick??? Picked it up at a swap meet,it looks like electric power but i have some .049 left over from tractor pulling and have been wanting to fly some of them....so i am looking at HS-81 servos...It does have 2 aileron bays in the wing...Thanks for the help......

What is the wing span?

Sorry...35"Cords 5 1/2"

servos anything over 11g to 16g will have enough power to motivate the surfaces if for 1/2A. The trick is use the inner holes on the servo horn less movement but you won't strip gears. You can use the outermost hole in the control horn at the elevator etc.wont load the servo as much.
Hitec HS-65HB Mighty Karbonite Feather Servo 31oz at 6v

http://www.ebay.com/itm/Hitec-HS-65H...ht_3344wt_1086


Includes: 4 Serov with Hardware

Specifications:

• Motor Type: 3 Pole
• Bearing Type: Top Ball Bearing
• Speed (4.8V/6.0V): 0.14 / 0.11 sec @ 60 deg.
• Torque oz./in. (4.8V/6.0V): 25 / 31
• Torque kg./cm. (4.8V/6.0V): 1.8 / 2.2
• Size in Inches: 0.92 x 0.45 x 0.94
• Size in Millimeters: 23.34 x 11.43 x 23.88
• Weight ounces: 0.39
• Weight grams: 11.06

Thanks... I will get some H-65 and try it....