Bruce’s article is the best I found as well. I had a first generation, 2 bladed, feathering, MaxProp that was in need of a rebuild. I repowered with a Beta 25, not a saildrive. I upgraded to the 3 bladed, 15 inch, feathering, Max Prop. PYI recommended that prop, the size and set the pitch before they shipped it. I sent the data to Beta and they agreed it was a good fit.
As far as performance is concerned, The 2 bladed Maxprop was like dropping anchor when I put it in reverse. The 3 blade has slightly less stopping power in reverse. It took about 3 times approaching the dock to adjust, but it is minimal. The 3 blade has a little less prop walk to port in reverse. I don’t race, at least, not on my boat. I have owned the boat for 5 years and have never had a fixed prop on it. So I cannot give you a measurement of lessoning drag advantage. Again, read that article. It is very informative. I am sure it was not cheap to perform the experiment.
I am very happy with the combined performance of the two. We can carry on a conversation while motoring without raising our voices.
Chuck Garbarino
As You Wish
N30U #292
Sodus Point, NY