How fast do boat propellers spin

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Recreational boat propellers are usually offered in two-inch pitch increments within a prop model line, but some high-performance props are offered in one-inch increments to allow for fine-tuning boat performance. Propeller diameter is simply the diameter of a circle scribed by the blade tips of the prop. Propeller pitch is the distance the prop would move forward in one rotation if it were moving through a soft solid—think of a screw being turned into wood.

The blades on a propeller are analogous to the threads on a screw. Some propellers have a constant pitch, meaning the pitch is the same at all points from the leading edge to the trailing edge of the prop blades.

Prop anodes are concentric so won't cause imbalance. But that's not the way to go: fixing the leccy issue is what's needed. If on shore power, do you have a galvanic isolator? No not never connected to shore power. On a swinging mooring. Battery disconnected by keys every time I leave the boat.

This type of hub often seems to be reported as having anode problems like this. I believe, now, it is the quality of the hub itself and poor anode design. Hence the need to fit bigger anodes. I'm aware of your earlier thread, although I can't recall all the details. Before going to the bother of one-off anodes I'd be inclined to investigate the practicality of a hanging anode bonded to the whirly bits when the boat is on its mooring.

However, I'm not particularly familiar with saildrives, so suggest you take further advice on precisely how this might best be accomplished.