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prop recommendations and gear ratio for yanmar? #16078
02/09/15 05:26 PM
02/09/15 05:26 PM
Joined: Oct 2013
Posts: 2
Kingfield and Rockland, Maine
tomhildreth Offline OP
Forum Newbie
tomhildreth  Offline OP
Forum Newbie
Joined: Oct 2013
Posts: 2
Kingfield and Rockland, Maine
Thinking about a new prop for J30 #456 1983. Yanmar 2GM
Existing Martec is very worn and I'm told it is also very inefficient. Looking for more push in a headwind so can maintain at least 5 knots. Still want folding prop as lots of pots in Penobscot Bay and still to sail fast.
[Need the gear ratio so I can get a quote from suppliers. Looking at Flex-Fold - any thoughts or recommendations?

Thanks!
Tom Hildreth
Kingfield ME

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Re: prop recommendations and gear ratio for yanmar? [Re: tomhildreth] #16079
02/09/15 08:06 PM
02/09/15 08:06 PM
Joined: May 2007
Posts: 2,668
Portsmouth, RI
Rhapsody #348 Offline
Past J/30 Class President
Rhapsody #348  Offline
Past J/30 Class President
Joined: May 2007
Posts: 2,668
Portsmouth, RI
Check the modelof your transmission. Standard Yanmar Kanzakai ratio is 2.62 to 1

Re: prop recommendations and gear ratio for yanmar? [Re: tomhildreth] #16080
02/09/15 10:06 PM
02/09/15 10:06 PM
Joined: Oct 2013
Posts: 2
Kingfield and Rockland, Maine
tomhildreth Offline OP
Forum Newbie
tomhildreth  Offline OP
Forum Newbie
Joined: Oct 2013
Posts: 2
Kingfield and Rockland, Maine
Thank you

Tom H

Re: prop recommendations and gear ratio for yanmar? [Re: tomhildreth] #16085
02/14/15 02:18 AM
02/14/15 02:18 AM
Joined: Nov 2012
Posts: 125
San Francisco
alx Offline
Senior Member
alx  Offline
Senior Member
Joined: Nov 2012
Posts: 125
San Francisco
Ananda has a 14" 2-blade feathering Max Prop which works beautifully - especially in reverse where it really shines in comparison to the Martec. A folding prop is likely better if you have lots of pots around though.

Re: prop recommendations and gear ratio for yanmar? [Re: tomhildreth] #16088
02/15/15 10:21 AM
02/15/15 10:21 AM
Joined: May 2007
Posts: 2,668
Portsmouth, RI
Rhapsody #348 Offline
Past J/30 Class President
Rhapsody #348  Offline
Past J/30 Class President
Joined: May 2007
Posts: 2,668
Portsmouth, RI
Tom - The stock prop on my J/109 is a 2 blade Flexofold. This is the installation sheet that has some good pictures. Performance on the J/109 is very good ahead and astern. Becuase it is geared, you don't need to position the shaft as you do with the Martec folding prop to align the blades side by side for optimal feathering.

Installing anything other than the Martec on a J/30 is not in accordance with class rules for OD racing.

Re: prop recommendations and gear ratio for yanmar? [Re: tomhildreth] #16264
05/13/15 02:19 PM
05/13/15 02:19 PM
Joined: Oct 2004
Posts: 27
Amelia Island, FL, USA
Skimmer Offline
Southeast District Governor
Skimmer  Offline
Southeast District Governor
Joined: Oct 2004
Posts: 27
Amelia Island, FL, USA
I had to replace my prop this year!

Both sides of the Martec Prop had cracks.

Potentially caused by a line I caught several years ago...

I replaced it with a new one and the folks at Martec were able to rush the job so I could get to the St. Augustine Offshore Series...

Skimmer J30 Prop
Skimmer J30 Prop


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Skimmer
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