Are there some simple rules to establish the best propeller/engine combination? I know that there are recomendations in the instruction manual that comes with the engine, but I have noticed that opinions are varied about which prop size is the best for the job. As an example let me tell you, I have a Four Star 60 which I plan to fly with a K&B 65 ( I was planning to use a Magnum 1.08 but I was told it was an overkill - what do you think?), how can I determine the best match for this combination?