It is hard to tell exactly how big/small that plane is. From what I've seen it looks like a .25 would fly it nicely. A .15 may do it. Just not sure about the size. It all depends on the weight to determine what motor is needed. I've got a Fat Free Taco which is a .25 size profile that weighs 3 pounds. I have a Saito 40 on it now but had a .25FZ which flew it fine also. I wanted more low end torque for 3D. My WS is 36". Your plane should weigh less than mine, so a .25 would work great and a .15 should work. The version my club member had was larger. He had a .40 2-strk on his, but his was larger than my Fat Free Taco, so you must have a smaller version of the same plane.

I am using 5 micro servos HS-85MG instead of standard servo. 2 HS-85 = 1 standardservo in weight.