On smaller glow engines i run the APC brand unless it's going on a trainer that my students are going to get ground strikes with, then I go to the Master Airscrews, almost bullet proof. I don't use wood until I go past 17 inches or so then I go right to the Xoar props. I keep a box full of props and test the different sizes and pitches that are in the range of what the manufacture recommends until I {the pilot} can find the one that will fly the plane the way I like the plane to fly. Same rule of thumb as control line engines, longer prop with a lower pitch= slower speed with more torque. Shorter prop with higher pitch= less torque but faster plane with longer take off runs and faster landings. Most props need to be ballanced and it shows up as vibration when you get a bad one. APC props other then a size or two need to be ballanced. In th eXoar wood props they state already ballanced and for the most part that's true but I still stick them on my maching and test them. It's up to the pilot to find that perfect prop, most .46 engines like the 11 inchers but some planes fly a lot better with a different pitch. Up to you to do the testing, I enjoy seeing how my planes react to differnet props, I just hate taking the spinners off and putting them back on again!!