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Old 24 June 2015, 02:51   #1
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Country: UK - England
Town: Bournemouth
Boat name: Lucky Heather
Make: Whaly
Length: 4m +
Engine: 30hp Mariner
Join Date: Mar 2015
Posts: 93
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Which prop?

Hi all, I'm after a new prop fory 30hp mariner (698) how do I workout what size and pitch I need? Cheers joe
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Old 24 June 2015, 03:54   #2
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Country: UK - England
Town: Leicester
Length: 5m +
Engine: 135hp Mercury
Join Date: Sep 2013
Posts: 708
Starting point would be to run at Wide Open Throttle with your current prop & see what the revs are & whether that falls within the WOT band recommended by the engine maker.
After that its a case of deciding what you're after performance wise.
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Old 24 June 2015, 04:32   #3
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Country: UK - England
Town: Sussex
Boat name: Bombard, Y-162
Make: Aerotec 380, Y-Class
Length: 3m +
Engine: Mercury Mariner 15hp
Join Date: Jul 2010
Posts: 2,692
Some links in this other prop topic might be of help.

Y Class avon best prop?
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Old 24 June 2015, 05:01   #4
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Country: UK - England
Town: Bournemouth
Boat name: Lucky Heather
Make: Whaly
Length: 4m +
Engine: 30hp Mariner
Join Date: Mar 2015
Posts: 93
RIBase
cheers guys, I assume I need a rev counter. WOT sounds good, I'd like a little more top end : )
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Old 24 June 2015, 07:22   #5
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Country: UK - England
Town: Sussex
Boat name: Bombard, Y-162
Make: Aerotec 380, Y-Class
Length: 3m +
Engine: Mercury Mariner 15hp
Join Date: Jul 2010
Posts: 2,692
Quote:
Originally Posted by papajoe View Post
cheers guys, I assume I need a rev counter. WOT sounds good, I'd like a little more top end : )
Tinytach clone off eBay, 10 or so from China direct or a little more from UK re-sellers.
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