RE: which props are recommended
I have little experience with engines under .46. I do have a plane with 3 blade and they recommended a size smaller than recommended for 2 blade. I have a 4 stroke OS 91 and have a 3 blade 12X6 prop on it which was recommeded for that engine., Check the paper work that came with the engine and then use that as a rule of thumb as to what 3 blade would work.
Stick Flyer