recomende prop for Mcculloch 72hp

50x30

50x30

depend . I used 50x30 max 3800 rpm TO but it cruise at 3100 60 mph. use more runway but it cruise with less power.
chuckp
 
The propeller of choice for a Mac used to be a Troyer 46-30 or 50-28 but Mr. Troyer has long since passed from the scene.

Check with Tennessee Propellers:

https://www.tn-prop.com/prop.htm

They’re good people and I would go with their recommendations. They get lots of feedback from their customers so you can’t go wrong as to pitch and diameter recommendations.
 
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