Patricia Bess is a 1983 424 ketch with the original Westerbeke 58 engine.
I have owned her since Oct 2014.
I have always thought she was a bit sluggish under power, but had no idea how
much until I buddy boated with a friend. When we motored side by side he was doing
5 kts at 1800 rpm (Catalina 36) and I was doing 2500 rpm to keep up.
After reading a number of forum postings on speed vs rpm as well as prop size,
it’s easy to see I have a problem.
From what i’ve read, the original prop on the 424 is a 12”x13”LH three blade.
The prop on the Patricia Bess is a 18”x11”LH three blade.
I can see from past surveys that the boat has had the smaller prop since at least Sept 2005.
My questions are:
Did all 424s come delivered with 20”x13” props on 1.5 shafts?
What should I expect if I reprop to a 20”x13” prop? (rpm vs speed)
Why would the PO down size to the 18”x11” prop that’s now on the boat?
Can I repitch the prop I have to a 18”x13” to get more power?
I do not want to spend $3000 plus for an adjustable prop.
Any input is greatly appreciated.
S/V Patricia Bess