Prop size and pitch BD722 Beta Marine on Mac 27

[Colin Jones]

Macwester 27 with Beta BD722 / Beta 20, rated 20 hp at 3600 rpm. Looking for real-world propeller matches. What gearbox model and ratio are you running, shaft diameter, prop diameter/pitch/blade count, and what max rpm do you achieve under load with a clean hull? I need to source a new prop for our new Mac 27 but suspect the current 2 blade is not right.

[Stuart Marklew]

Hi Mate, my Stag 28 with the bd722 was sized for 13″x 9″ p , however a 12″ x 10″ pitch should be equally as efficient if you need a bigger clearance, it must be a Right hand prop preferably with a 25mm dia shaft as opposed to the old 1″ dia shaft

Regards Stuart Marklew.

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