The prop chart is great but it's just going to give you an idea of where you can start your testing. You still must keep the engine in it's working RPM range then it's a pilots choice. Ken posted up the OS sheet and Bill Baxter gave you more ideas. You will find over time you will have a very big box of props, Just look at John Buckners shop wall!! You will never walk into any hobby shop with as many props as John has.