Prop size and pitch 40 Albin

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Capttman
Deckhand
Deckhand
Posts: 7
Joined: Sat Mar 16, 2019 8:05 pm
Home Port: Boston

Sat May 11, 2019 6:27 am

My Albin 40 sundeck is running 22 inch props with 16 pitch. I have dual Lehman 135’s and I don’t seem to be getting the speed others claim to get at certain RPM’s so I’m wondering what other 40 foot owners are running for props and pitch.

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jleonard
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Posts: 2047
Joined: Fri Sep 22, 2006 7:35 am
Home Port: Mystic, CT
Location: New Port Richey, FL

Sat May 11, 2019 7:55 am

Have you calibrated your tachs with a hand held? If not then you need to before making any adjustments.
What is your current WOT rpm?
Edit:
For the record, I have a single Lehman 120, 2:1 tranny ratio. I am running a 20 x 16 4 blade prop.
"Normal" cruise speed is 6.5 to 7 knots at 1650/1700 rpm. My WOT rpm is right on the money at 2500.
I am getting similar speeds and economy to other 40 single engine boats that I have communicated with on the trawler forum.
1983 40 Albin trunk cabin
Attitude Adjustment
Mystic, CT

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