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Official prop thread #12784
01/03/12 11:34 AM
01/03/12 11:34 AM
Joined: Oct 2009
Posts: 369
Squamish, British Columbia
NaturalHigh Offline OP
Senior Member
NaturalHigh  Offline OP
Senior Member
Joined: Oct 2009
Posts: 369
Squamish, British Columbia
I found a lot of good info about props scattered about the site so I thought I would make a thread for all things prop.

I noticed this post from Mr. Christy:
Originally Posted by LChristy
During the recent sale of my boat the surveyor commented that the 14X14 prop that is class legal is the wrong prop for the boat. This has been confirmed by Bengt Johannson in discussions with Martec. With the current prop it is difficult to get the engine to 80% of max as encouraged by Yanmar. I believe this leads to carbon buildup in the cylinders. If the rings contract during the cold winter temps the carbon prevents them from returning to the cylinder walls. This can lead to cylinder damage. Happened to be about 10 years ago and had to have the engine rebuilt.

The J30 Class needs to look into this and see if a prop change is in order. Would help extend the life of your old engines.

Larry Christy
DA KINE (Sabreline 42)


Just wondering if Bengt made any recommendations as to what the proper prop would be? I think I am facing either a prop rebuild or replacement as mine is getting pretty floppy in the blades and they are tending to get stuck closed much more often.

If I am facing a replacement, I might look at a kiwi-prop. My slip-mate put one on his Santana 30/30 and he really likes it. He says the three blades make a huge difference to vibration levels. Does anyone have any experience on the J/30?


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Re: Official prop thread [Re: NaturalHigh] #12786
01/04/12 08:28 AM
01/04/12 08:28 AM
Joined: Oct 2006
Posts: 83
Waukegan, IL
jhoskins Offline
Senior Member
jhoskins  Offline
Senior Member
Joined: Oct 2006
Posts: 83
Waukegan, IL
Picked up a new 2-blade Gori last fall. Hope it performs well, Ill see in the spring.

My old Martec was in sad shape when I got the boat, and I had it rebulit. 4 seasons later it needs anouther rebuild and I figured I would try a higher quality prop.


John
Madcap 358
Re: Official prop thread [Re: NaturalHigh] #12792
01/04/12 03:16 PM
01/04/12 03:16 PM
Joined: Apr 2007
Posts: 483
Chicago, Il. USA
D. Bartley Offline
Governor at Large
D. Bartley  Offline
Governor at Large
Joined: Apr 2007
Posts: 483
Chicago, Il. USA
I've sent my prop back to Martec to have it rebuilt. Might have been something like $150? I don't remember exactly


Dennis Bartley
Planxty, s/n 23994
hull 205
Re: Official prop thread [Re: NaturalHigh] #12793
01/04/12 03:28 PM
01/04/12 03:28 PM
Joined: Apr 2007
Posts: 188
Atlanta, GA, USA
whitedolphin Offline
Senior Member
whitedolphin  Offline
Senior Member
Joined: Apr 2007
Posts: 188
Atlanta, GA, USA
One other note about the Martec's. I recently had mine rebuilt since it was quite loose. Apparently there are 3 different size bushings you can put in the prop when rebuilding - each time they have to go to the next size up.

When you get to the last size (which I have), that's it - no more rebuilds!

-djm

Re: Official prop thread [Re: whitedolphin] #12799
01/04/12 07:41 PM
01/04/12 07:41 PM
Joined: May 2007
Posts: 2,586
Portsmouth, RI
Rhapsody #348 Offline
Past J/30 Class President
Rhapsody #348  Offline
Past J/30 Class President
Joined: May 2007
Posts: 2,586
Portsmouth, RI
Rhapsody's prop was rebuilt by by sending back to Martec in 2009. The cost was ~ $230 and included drilling for over-sized pivot pin, weld buildup for blade stops, and machining back to original spec. It came back looking like a new prop.

[Linked Image]

Martec redrilling pins [Re: Rhapsody #348] #12800
01/05/12 08:17 AM
01/05/12 08:17 AM
Joined: May 2007
Posts: 1,234
Newport and Naples
Cap'n Vic Offline
Senior Member
Cap'n Vic  Offline
Senior Member
Joined: May 2007
Posts: 1,234
Newport and Naples
So OK ... for background
1. photo of original pivot pin in drilled out hole

[Linked Image]


2. photo of pivot pin that depends on groves to hold in place
[Linked Image]

3. photo of cotter pins that hold the pivot pin in place
note that there is only so much room to redrill before the cotter pins will not work. see top photo [Linked Image]

Attached Files
original pin.jpg [47.95 KBytes] - (958 downloads)
original pin in drilled out hole
pin.jpg [27.83 KBytes] - (947 downloads)
pivot pin with grooved locking areas
cotters.jpg [66.93 KBytes] - (1030 downloads)
use of cotter pins to lock pivot pin in
Martec Propeller additional data thread [Re: Cap'n Vic] #12801
01/05/12 08:31 AM
01/05/12 08:31 AM
Joined: May 2007
Posts: 1,234
Newport and Naples
Cap'n Vic Offline
Senior Member
Cap'n Vic  Offline
Senior Member
Joined: May 2007
Posts: 1,234
Newport and Naples

Last edited by Cap'n Vic; 01/05/12 08:34 AM.
Re: Martec Propeller additional data thread [Re: NaturalHigh] #12861
01/12/12 02:27 PM
01/12/12 02:27 PM
Joined: Oct 2009
Posts: 369
Squamish, British Columbia
NaturalHigh Offline OP
Senior Member
NaturalHigh  Offline OP
Senior Member
Joined: Oct 2009
Posts: 369
Squamish, British Columbia
I have the 3/4" shaft and it seems there are a LOT less options for replacements than having the 1" shaft. I don't think I can even get a Kiwiprop.

Re: Martec Propeller additional data thread [Re: NaturalHigh] #12871
01/14/12 01:30 PM
01/14/12 01:30 PM
Joined: Oct 2007
Posts: 157
Vancouver, BC, Canada
dlabrosse Offline
Senior Member
dlabrosse  Offline
Senior Member
Joined: Oct 2007
Posts: 157
Vancouver, BC, Canada
Scott,

Martec is quite reasonable. I bought a new Martec prop last year (to keep the integrity of the one design) and it really helped with vibration. As new props go, it's pretty cheap. Now I can reliably go backwards... bonus!


Dominique Labrosse
Red Five, #92
Re: Official prop thread [Re: NaturalHigh] #12879
01/16/12 06:40 PM
01/16/12 06:40 PM
Joined: Oct 2006
Posts: 83
Waukegan, IL
jhoskins Offline
Senior Member
jhoskins  Offline
Senior Member
Joined: Oct 2006
Posts: 83
Waukegan, IL
I am going to try a Gori this season. It seems to have a much higher build quality than the Martec. Plus I was out of rebuilds on the Martec.

Hope it quiets some of the vibrations!

[Linked Image]

[Linked Image]

Attached Files
photo.JPG [45.85 KBytes] - (805 downloads)
prop.JPG [49.07 KBytes] - (902 downloads)

John
Madcap 358
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