If you go into the ARF section on the forum you may find a number of threads on this plane and see what others have done with it and see if there are any changes needed. An engine doesn't know if it's got a two or three bladed prop on it but Mike was correct, if you have found a two blade that will fly the plane the way you like then a three blade just goes down one size in length and up one in pitch to get close to the same flight effects. You need to test props to find the one you like best.