what prop do I need

[Whopperstopper]

2011 Nitro Z7 with the Merc 150 it came with new. What size prop is needed for this rig?

Thanks

[Extremeboating]

That's really vague. You need to provide more specific information like what model 150 it is, a standard or ProXS, current WOT RPM, current pitch prop, and your current max speed for anyone to be able to help you.

[Whopperstopper]

OK. it's a pro XS. 24 in prop now Merc Tempest. 5100 rpm is all this set up get. 50 mph tops

[21XDC]

Test a 21P Tempest plus... Normally the 23P is common on the 150's and 18-19ft boats.

[Whopperstopper]

Thanks Mike.

[21XDC]

This is assuming the motor is running at 100%, You are trimming up, and getting full pull on throttle linkage.