What Prop?

[McGillicuddy]

Jorge,
You prop appears to be an older Yamaha semi-cleaver probably 14" diameter by 17" pitch. Could also be an old Force prop. Unless you find an old prop catalog from the '80s it will be hard to determine exactly as most folks don't document the specifics of their prop. The prop will be a decent match for the MA w/150 Merc combo, but you can do better. It has stern lifting qualities and should turn close to your target 5800 rpms or so.

Probably get you 40 mph at top end +- 2mph. I think a PowerTech MQS3-16 pitch will be your best bet.

To measure diameter, place the prop on a work bench take a square to the edge of a blade and use a tape measure to measure the outer-most point of the blade to the center of the prop hole. That number x 2 is your diameter.

To confirm the pitch a prop shop can lay it on a semi-cleaver repair mold and give you that.