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Old 29 October 2013, 13:29   #1
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Futura prop size

Zodiac Futura Mk 2, 4.2m with yamaha 30, no diving kit usually 2 people on board, what size prop do we think?
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Old 29 October 2013, 21:39   #2
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Get a tach, and take it for a full throttle spin. Then report your end results along with your current prop. There doesn't seem to be a given prop, it is more a discovery item.
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Old 30 October 2013, 03:25   #3
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That's the trouble Peter, there is no current prop! I've never used this boat so am after a best guess prop size.
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Old 30 October 2013, 03:37   #4
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For the futura, it would be best to find out which prop yamaha originally supplied as standard. Failing that, these props begin around a pitch of 8" and go up to 14". I would begin in the upper range of that as it is a sib and a bit lighter than a rib. My guess and it is only a guess would be around 11" or 12" pitch. Yamaha always supplied mid size as standard. It is always trial and error, especially when you have no starting point.
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Old 30 October 2013, 12:14   #5
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What engine is it? Current F30 747cc? I would start with 14 or 15 then.
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Old 30 October 2013, 15:00   #6
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That's a point, I thought it was the one in the picture. Clearly not. My thoughts were for 3 cyl 2 stroke. Same rules apply though, yamaha usually supply mid size pitch to get things going.
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Old 30 October 2013, 15:39   #7
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Quote:
Originally Posted by RIB-Teccie View Post
Yamaha always supplied mid size as standard.
Not on a 30hp, at least not in this country. Up to and including 25hp motors come with a standard prop but that's the largest size coming with a prop. Everything from there up is dealer selected in consultation with the owner based on the boat being fitted.


The range for that engine is 8 to 14" pitch.
http://www.yamahaoutboards.com/sites...20-%2030hp.pdf

I would go with a 13" pitch to start (be sure you have a tach fitted). While its a light boat with a light load they have a surprisingly large wetted surface. Don't spend the extra money on a "performance" prop since you are playing a guessing game to start anyway. Just get a standard prop with 9-7/8" diameter.
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Old 30 October 2013, 15:42   #8
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Hmm I see no picture
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Old 30 October 2013, 16:04   #9
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Yep, my fault for replying with bleary eyes, I saw the picture on Pete's thread. Doh!!
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Old 30 October 2013, 16:57   #10
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I run a 15" on mine and dropped down from a 17", but my diameter is probably larger, plus my engine is a dirty 2 stroke 40HP, and I scuba dive and haul heavy loads at times, so for me it is more about torque.

Do you have a shop around you that offers a trade in program for props?
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