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Old 03 March 2016, 20:18   #1
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Country: USA
Town: NYC
Boat name: F470 CRRC
Make: Zodiac
Length: 4m +
Engine: 35hp outboard
Join Date: Mar 2016
Posts: 5
F470 CRRC Owners, help!

Hello everyone. I recently purchased a Zodiac F470 CRRC. I currently have a 2stroke 1990's 35hp Evinrude/Johnson on it. I am wondering if anyone here has a similar configuration from which they could recommend a propeller size?

What I have on it now is way off, the 35hp was on a heavy boat twice the bulk of this inflatable. Hoping I can get a solid recommendation to start with instead of throwing money away on props.

Thanks so much!
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Old 04 March 2016, 10:09   #2
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Country: USA
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Boat name: Thumper
Make: Avon CRRC 4.5
Length: 4m +
Engine: Merc 50
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Welcome mate, roll up floor or hard deck?
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Old 04 March 2016, 10:23   #3
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Country: UK - England
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You need to do several runs at wide open throttle with your boat normally laden.
Note the boat's speed and what the engine revs are at WOT (the WOT revs figure being the more important if you haven't got a speedo or GPS)
Find the engine manufacturers recommended WOT range for your engine & see where the figure you achieved is.
Once you've got that you can select the best prop for your usage without a lot of trial & error.
Have a look at this thread & you'll get the idea:
Prop options for Mariner 125hp
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Old 04 March 2016, 11:59   #4
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Country: USA
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Boat name: F470 CRRC
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Length: 4m +
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@squidbote, its a roll up. I use it as a dinghy, rolls up on deck.
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Old 04 March 2016, 12:03   #5
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Country: USA
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Boat name: F470 CRRC
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Length: 4m +
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Thanks @paintman .. There is no prop on it for me to test rpms (i have a tach), the prop it came with was waaay off and will not stay in gear from lack of thrust. So i am jumping in blind, hence advice for the first one. Was hoping someone here had same boat and motor to emulate. Right now I am guessing its a 10x15 what I need. Cheers
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Old 04 March 2016, 13:34   #6
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Don't know whether you've seen this, but might be worth having a play - select length 15-17 & it suggests 13 pitch, select 13-15 & it suggests 14 or 15 pitch.
https://www.miwheel.com/outboard-pro...zing-analysis/
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Old 04 March 2016, 13:49   #7
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Country: USA
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Boat name: F470 CRRC
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Thanks for the link @paintman!
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Old 05 March 2016, 11:56   #8
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Engine: 2016 Merc 115hp CT
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How many persons and gear do you want to transport? How many gallons of fuel do you want to carry for what range?
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