Our old propeller is a 3 blade bronze propeller marked 12x10. That's 12" diameter with a 10" pitch. It is right handed with a 12:1 taper of the hole for the shaft from around 25mm down to 20mm over a shaft length of 57mm.
Reading around the web the most efficient propeller would have one blade and the smoothest would have a large number of blades. Yacht propellers are always 2 or 3 bladed. Two needs a larger diameter for the same thrust.
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