30' chris cat props
 

86 chris cat
30'
900SC (dynoed 900 HP @ 5.5 boost) moved 2' forward
#4 drives with merc. extension boxes (1.4 gears)
boat weights about 8000lbs

need help on props im hoping for about 130 mph :evilb:my need to turn up the boost.

Cody,,,i forgot .....are they bigshaft #4's or smallshaft ?

Propwise i would start with a 4 blade 17-18 X 30-32 to see what she does.

If you turn the engines at 6000, you'll need 36 inches of pitch. Test with 17"-17.5" diameter props in the largest pitch you can find. You need some type of base line to get started.

Brett