if I'm turning a Labed 30 Bravo one, with a 1:50 Bravo drive, and I go to a B Max 1:30 ratio, what prop would I need? Educated guess please?

Had the bmaxs and went down from a 32 stock 4 blade to a 28 stock 4 blade but needed to try a 26 or labbed 28s.

About a 10% reduction in pitch.

Julie

30 pitch with 1.50 ratio is the same as a 26 pitch with 1.30 ratio, mathmatically anyway.

http://www.go-fast.com/Prop_Slip_Calculator.htm

I recently went from a 1.50 to a 1.36.
Had a 28 bravo and now a labbed 26 bravo.

I went from a lab finished 30 to a labbed 26 the math is correct

Thanx all. I will be sticking with another XR drive instead of B max this time.

Mine came with 30 and 1.50,went to bmaxs, had to run 24's to get the rpm back.

I put Whipples on and when up 6 prop sizes, 24 to 30's and went up from 5200 to 6000rpm,18-20 mph gain