Reply
 
Thread Tools Search this Thread
 
Old 29 October 2013, 18:29   #1
Member
 
Kernow Buoy's Avatar
 
Country: UK - England
Town: Cornwall
Length: no boat
Join Date: Oct 2004
Posts: 1,518
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?
__________________
Kernow Buoy is offline   Reply With Quote
Old 30 October 2013, 02:39   #2
Member
 
Peter_C's Avatar
 
Country: USA
Town: NorCal
Boat name: SHARKY
Make: AB
Length: 4m +
Engine: Honda BF75 & BF5
Join Date: Dec 2009
Posts: 2,091
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.
__________________
Peter_C is offline   Reply With Quote
Old 30 October 2013, 08:25   #3
Member
 
Kernow Buoy's Avatar
 
Country: UK - England
Town: Cornwall
Length: no boat
Join Date: Oct 2004
Posts: 1,518
That's the trouble Peter, there is no current prop! I've never used this boat so am after a best guess prop size.
__________________
Kernow Buoy is offline   Reply With Quote
Old 30 October 2013, 08:37   #4
Member
 
RIB-Teccie's Avatar
 
Country: UK - England
Town: Leeds
Make: Valiant 450
Length: 4m +
Engine: Yamaha 55HP
Join Date: Jan 2013
Posts: 448
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.
__________________
RIB-Teccie is offline   Reply With Quote
Old 30 October 2013, 17:14   #5
Member
 
Country: USA
Town: Portland, OR
Make: Zodiac F470
Length: 4m +
Engine: Suzuki DF25EL
Join Date: Jun 2013
Posts: 231
What engine is it? Current F30 747cc? I would start with 14 or 15 then.
__________________
SIBRider is offline   Reply With Quote
Old 30 October 2013, 20:00   #6
Member
 
RIB-Teccie's Avatar
 
Country: UK - England
Town: Leeds
Make: Valiant 450
Length: 4m +
Engine: Yamaha 55HP
Join Date: Jan 2013
Posts: 448
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.
__________________
RIB-Teccie is offline   Reply With Quote
Old 30 October 2013, 20:39   #7
Member
 
Country: USA
Town: Seattle
Boat name: Water Dog
Make: Polaris
Length: 4m +
Engine: Yamaha 60hp
Join Date: Apr 2007
Posts: 1,152
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.
__________________
captnjack is offline   Reply With Quote
Old 30 October 2013, 20:42   #8
Member
 
Country: USA
Town: Portland, OR
Make: Zodiac F470
Length: 4m +
Engine: Suzuki DF25EL
Join Date: Jun 2013
Posts: 231
Hmm I see no picture
__________________
SIBRider is offline   Reply With Quote
Old 30 October 2013, 21:04   #9
Member
 
RIB-Teccie's Avatar
 
Country: UK - England
Town: Leeds
Make: Valiant 450
Length: 4m +
Engine: Yamaha 55HP
Join Date: Jan 2013
Posts: 448
Yep, my fault for replying with bleary eyes, I saw the picture on Pete's thread. Doh!!
__________________
RIB-Teccie is offline   Reply With Quote
Old 30 October 2013, 21:57   #10
Member
 
Peter_C's Avatar
 
Country: USA
Town: NorCal
Boat name: SHARKY
Make: AB
Length: 4m +
Engine: Honda BF75 & BF5
Join Date: Dec 2009
Posts: 2,091
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?
__________________
Peter_C is offline   Reply With Quote
Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




All times are GMT. The time now is 21:45.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.