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thank you verry much for the answer.
the verado is 2010 i think.
there is a"prop selector" on the mercury website. you put your details in and it reccomands on a prop.
this is what i came up with:

Boat type: Bay Boat
Usage: Mid range cruise / fuel economy/0 ft
Engine Manufacturer:Mercury
Engine Type: Outboard
Engine Year: 2008
Number of Engines: One
Engine Family: Verado
Engine: 150 Verado
Drive / Gear Case: Verado 2.08 Gear Ratio
DETAILS
Calculated Pitch: 16.64
Calculated Weight with engine(s): 3,897.62 lbs
Calculated Engine RPM: 5,950
Calculated Boat Speed: 41.08 mph

and the recomindations are for :
blades D P
Black Max® 3 16 16 RH 16440A45
Black Max® 3 15 17 RH 832828A45
Mirage® Plus 3 15.5 17 RH 18278A46
Revolution 4® 4 14.6 25 15 RH 857022A46
SpitFire® 4 14 17 RH 8M0084494
Vengeance® 3 14.5 17 RH 16314A46


what do you think?