[THEFERMANATOR]

Diameter and blade style also play a HUGE role. I've run several different 19 pitch props on my COBRA, and all with different results. I've run a 4 blade powertech that was 13 3/8"X19X4 and it hit 5200 with light trim and reached 48MPH(had it up to 5600 with alot of trim but the boat became uncontrollable beyond 53MPH). An aluminum prop that was 13 3/8X19X3 and it would turn right up to the 6100 limiter and only hit 40MPH. I've got a 14X19X3 aluminum that turns 6700RPM's and reach's 45MPH. My current VIPIR now turns 5600RPM's and tops out at 52-53MPH, but it would hit 51-52MPH @6100RPM's(rev limiter is 6100RPM's) before being rebuilt. There is no exact science to picking a prop, but through the dozens(and I do mean dozens) of props I've been through. You can't go wrong with a MICHIGAN MATCH ALUMINUM for all around durability and price.