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Congratulations on buying the First 456--we just competed a 12 year circumnavigation in ours.
With the perkins 4108 and a hurth 2.74 transmission we are using a 20" 3-blade Maxprop, set to a pitch angle of 22 degrees or 15.1", whereas Maxprop recommended 20 degrees or 13.7" pitch.
The Maxprop isn't cheap, but its adjustable, and the feathering feature really improves sailing performance.
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