while doing my training I had asked my instructor what prop to put on my plane..  he started with a general recommendation and then said "if you dont like how it flies with that prop, use a different one"  So yeah I have 3-4 different props for an engine, but hey I can change how my plane flies by changing out the prop.  I feel like i want a gentle day... large diameter small pitch.... if i feel like hey i want to zip around....  small diameter larger pitch.  Works so far