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Prop Selection ? 22 X 14.5 four blade

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ppmeis
First Mate
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Posts: 30
Joined: Mon Mar 07, 2011 1:26 pm
Home Port: Marinette, WI

Prop Selection ? 22 X 14.5 four blade

Post by ppmeis »

36 foot, aft cabin, single Lehman 120. What size prop are other owners running ? I have a damaged 22 X 14.5 four blade (ran it all last year) also have a 22 X 15 three blade as backup. What are you other guys running ? Before i damaged the 4 blade I was running about 1750 RPM at around 8 - 9 knotts, nice and smooth, seemed like good economy but wondering if anyone has better ideas. thanks, pete.
jleonard
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Home Port: Mystic, CT
Location: New Port Richey, FL

Re: Prop Selection ? 22 X 14.5 four blade

Post by jleonard »

What tranny ratio do you have?
What is your WOT rpm? Is this with a calibrated tachometer?

I have a 40 with a Lehman 120. 1:91 to 1 tranny ratio. 20 x 16 4 blade prop. On a good day I can get about 8.3 knots at 2500 rpm (WOT) with a calibrated tach.

EDIT: At 1750 rpm I am doing about 6.5 /7 knots
Last edited by jleonard on Thu Oct 13, 2011 4:19 pm, edited 1 time in total.
Formerly
1983 40 Albin trunk cabin
Attitude Adjustment
Mystic, CT
psneeld
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Home Port: Avalon, NJ

Re: Prop Selection ? 22 X 14.5 four blade

Post by psneeld »

ppmeis wrote:36 foot, aft cabin, single Lehman 120. What size prop are other owners running ? I have a damaged 22 X 14.5 four blade (ran it all last year) also have a 22 X 15 three blade as backup. What are you other guys running ? Before i damaged the 4 blade I was running about 1750 RPM at around 8 - 9 knotts, nice and smooth, seemed like good economy but wondering if anyone has better ideas. thanks, pete.
While no expert..something doesn't sound right. Your 120 is rated for 2500 RPM and at 1750 RPM I'm reading you are putting out around 80hp. I have a hard time believing you get 8-9 out of 1750 RPM when my and other 40's are only getting 6.5 maybe 7 knots. If you are...then back it off even more as your hull speed is way less than 9 knots and your economy will be better.

What was your max RPM at full throttle?..should have been close to 2500.
Scott Neeld
Albin 40 Trawler
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