Props for Twins

[shooter]

I have a 7m plate alloy center cab and enquiring on prop selection as it runs 2 115 2 strokes aprox 08 build and have the original props. The outfit preforms well with lots of power in reserve and would like to drop fevs down at speed to improve on econemy. Can you surgest where to start with selection.

[boats.net]

The rpm range is 4500-5500 rpm's at full throttle, running a prop that run at high side of rpm range usually gives the best fuel economy. A smaller pitch prop increases rpm's and a larger pitch prop lowers rpm's.