reviving old seacraft (propeller question)

[Fr. Frank]

Dixon, a couple more questions:

Do you have a negative trim limiter, such as a rod extending from one side of the transom mount to the other, which limits how far down the engine will trim?

With the motor at neutral trim (cavitation plate exactly parallel to keel line), how high above the keel is the bottom of the cavitation plate?

I'm trying to figure out if you're cavitating or ventilating, or both. The fix is different depending on the cause of the air on the blades, because the cause affects where/how the air enters onto the blade, and produces the most vacuum.

If you're cavitating (or mostly cavitating), the fix is to change the angle of attack and departure angles on the blades by greater progressive rake, and/or increasing diameter of the prop, and/or increasing cupping, and/or increasing blade tip size.

If you're ventilating (or mostly ventilating), the fix is to increase the ability of the thrust side of the prop to hold water while surfacing, which is accomplished with increased cupping, and/or smaller blade tips with lots of cupping and reduced blade flex.

I'd like to actually see your boat out of the water in person, and have several props to try at once. I can bring my 15.25" x 16.5" PowerTech. You probably have the 14.5x19 SS Black Max, which is a mid-range propeller.

I can get a couple of different props to try from AAA Outboard, in different style and pitch. Just gotta set up a date and meeting point that works for both of us, if you're interested. And no, you don't have to buy any props. It's just nice to know what works best.

Maybe I can bring them to Long Point, unless you want to do this earlier?