My set up is a 509 mpi mag, adding a shorty what would be a good start for a prop?

509 mpi origional cam? 4 blade 24" pitch bravo one do not bother with a hydromotive. maybe 26

Mike S i do have a used 2" inch shorty only thing it would need 1.5 gear ratio's installed it is a 1:36 now with a big prop shaft. let me know if you are interested