Propeller for 40/40

[Riki]

We need a new propeller on our 40/40 and would like to find out what others have put on and if you are happy or unhappy with your choice. We appreciate all opinions and advice.
Thank you!
Riki

[F32Circle]

Happy with our Maxprop. Better than some folding props for reversing, it’s been said. I’ve not seen data.

[admin]

I have a 3 blade MaxProp and am quite happy with it.

Based upon some research that I did a few years ago, I think that it's over sized as you don't want the the tips going supersonic. I posted about this a few years ago, but I'm on my way back from Guatemala after storing the boat for hurricane season, and don't have time to look it up.

-- Geoff(in Miami)

[admin]

I found it: https://www.morganscloud.com/2016/04/17 ... ur-engine/

[Laisve]

Geoff, or anyone with a F40/40 and a Yanmar 3JH-TE, would you happen to know what the reduction gear ratio is on the transmission?

[Laisve]

That link seems to be broken.

[GeoffSchultz]

The URL had changed and I have edited the post to reflect the correct URL, which is:

https://www.morganscloud.com/2016/04/17 ... ur-engine/

[GeoffSchultz]

The Kanzaki KM3A has a ratio of 2.64

[Mark K.]

If racing, a folding or feathering prop is the way to go. I like the thrust and durability of a fixed 3-blade (especially for cruising) and put a Campbell Sailor on my F35. https://westbynorth.com/campbell-sailer/

The downside of a Max Prop is all the moving parts, less forward thrust compared to a fixed blade and the fact that when feathered, there is a gap between the blades and hub which can catch seaweed, fishing line and the like.

Mark K.
1994 Freedom 35'

[GeoffSchultz]

I disagree with the comments from Mark K. Please see https://www.sailmagazine.com/diy/why-lo ... propellers this article in Sail magazine.

-- Geoff