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Old 04 July 2011, 14:41   #1
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Country: UK - England
Boat name: The mystery machine
Make: zodiac pro 550 open
Length: 5m +
Engine: 90hp johnston
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Propeller Help

I have a 14 x 17 prop, and i am running a 13 7/8 x 17 prop, which is better on my boat i have a zodiac pro 550 open with a 90hp, W
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Old 04 July 2011, 18:22   #2
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Country: Australia
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Engine: Honda 150
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So about 1/8 of an inch difference in diameter, wouldn't have thought there would be any noticeable difference. What other differences are you aware of? Brand/model name, is one stainless and the other aluminium? Different blade profiles?

How does the boat run with the current propeller, what is the max rpm you reach and what is the maximum recommended for your engine?

btw, I'm no expert in the area as I am struggling with my own propeller selection issues.
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Old 04 July 2011, 21:03   #3
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Quote:
Originally Posted by Adam Brimage View Post
I have a 14 x 17 prop, and i am running a 13 7/8 x 17 prop, which is better on my boat i have a zodiac pro 550 open with a 90hp, W
Try each one on your boat and see which one performs the best. Keep the other as a spare
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Old 05 July 2011, 05:12   #4
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Country: UK - England
Boat name: The mystery machine
Make: zodiac pro 550 open
Length: 5m +
Engine: 90hp johnston
MMSI: 235074837
Join Date: Feb 2010
Posts: 24
Quote:
Originally Posted by dun_buyin View Post
So about 1/8 of an inch difference in diameter, wouldn't have thought there would be any noticeable difference. What other differences are you aware of? Brand/model name, is one stainless and the other aluminium? Different blade profiles?

How does the boat run with the current propeller, what is the max rpm you reach and what is the maximum recommended for your engine?

btw, I'm no expert in the area as I am struggling with my own propeller selection issues.
The one on at the moment is a viper stainless steel prop and the other one just looks like a normal steel or alu prop. the boat is a 5.5m zodiac pro 550 open and the engine is a 90hp dont know what revs i have had but i have had a top speed of 38knots.
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Old 05 July 2011, 05:44   #5
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Country: Australia
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Engine: Honda 150
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That sounds ok. According to the current Zodiac brochure, recommended power for the Pro Open 550 is 90hp and they list a max speed of 45mph (about 39 knots). You may or may not find a better matched prop but as Hightower says, you'd have to try them out to compare.

For comparison, my Pro Open 650 hits 41 knots (on the GPS) which matches the brochure, but is going over the maximum rev range for my engine so I'm looking at changing from a 19" pitch to a 21" pitch. Unless you are also over the maximum revs, you should be good.
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