Hi paulo. The choice might depend on how the boat performs with the current prop; do you reach max RPM and/or do you have cavitation issues, etc. If i were to get a different prop & had O/B power, it would be stainless as i believe that all O/B's are designed to use S/S props where some other drive types were not. A S/S prop can have a more aggressive cup placed on it. With a cupped prop, you get the low -end performance of less pitch, but also the top end performance of the "effective pitch" a cupped prop gives. The cup also allows you to run the O/B more out of the water creating less drag which has many benefits. I would contact Michigan Propellor for advise. Trim tabs will also give a performance increase.
Hi paulo. The choice might depend on how the boat performs with the current prop; do you reach max RPM and/or do you have cavitation issues, etc. If i were to get a different prop & had O/B power, it would be stainless as i believe that all O/B's are designed to use S/S props where some other drive types were not. A S/S prop can have a more aggressive cup placed on it. With a cupped prop, you get the low -end performance of less pitch, but also the top end performance of the "effective pitch" a cupped prop gives. The cup also allows you to run the O/B more out of the water creating less drag which has many benefits. I would contact Michigan Propellor for advise. Trim tabs will also give a performance increase.