Picking a prop

[geokel1014]

I want to change to a SS prop. I also want to change the pitch to get more top end speed out of the motor. The prop now has 12a 9P on it. A few friends say to change to a 12 or 13 pitch, but the diameter gets bigger to 10 1/4" and I don't want the prop to hit the bottom of the cavitation plate. Also, has anyone every addes a tach and if so which tach and how?

Thanks

Geoff

[boats.net]

Don't know what motor you have or how many rpm's your prop is turning but may be able to go up a pitch size as long it will stay in rpm operating range. If you get a prop for your model motor then prop shouldn't hit cavitation plate.