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Post by jole on Jun 24, 2005 22:39:52 GMT
Our yacht "Mystic" currently has factory fitted fixed 2 blade prop. Can I get better transfer of power from engine [Yanmar 3GM30F] to prop, and more control in reverse by changing to fixed 3 blade prop. If so what size and pitch, also any difference between left and right screw. From Jole, Melbourne, Australia
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Post by MartyB on Jun 25, 2005 3:20:38 GMT
You might want to also think about a feathering Max Prop. I have one on my 85, folds so it allows better performance under sail, yet when you are motoring, it flips out so that in foward and reverse you have as much as a fixed prop, with out the drag.
Marty
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Post by MalcolmP on Jun 25, 2005 11:34:40 GMT
Hi Jole Just changed my standard prop on our SO34.2 for an Autoprop self pitching, this really is a win-win-win other than the very high price Significant more power when motoring and motor sailing, , considerably less drag when sailing and elimination of most of the prop-walk when berthing. The down sides as well as price, is a slight delay while the blades rote for reverse, although then you have massive amounts of reverse power and the 2 blade version Autoprop that I went for (mainly on price) is not as well balanced as the 3 blade so a little more vibration is noted at some rev ranges The Gori is also highly recommended by sme owners Malcolm
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Post by warrenden on Aug 23, 2006 20:07:42 GMT
Malcolm,
Would you let me have details and price please? I have been contemplating this for a while and birthday is coming...
Andrew L
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Post by MalcolmP on Aug 27, 2006 21:52:48 GMT
Andrew
Bruntons normally do some good boat show offers, for the 2 blade your are in the £1000 region maybe and an extra £300 for the 3 blade, we do get some vibration on the 2 blade so I would suggest you have an in depth discussion with them at Southampton if you go to the show
Malcolm
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Post by so40gtb on May 3, 2007 1:29:50 GMT
Just installed a Kiwiprop on our recently-acquired '01. Haven't had enough time with it in different conditions for a full evaluation, but here are my reactions from motoring immediately after launch and going in and out of harbor the following day.
No prop walk, so it seems, though physics would make one expect at least a very little bit. Perhaps windage fooled me a bit, but, leaving the slip both days, when I engaged reverse, it went straight back.
The Yanmar and Kiwiprop are very quiet and have much less vibration than 2-bladed props on other boats we've sailed.
Power seems adequate, making 5 kt at 2000 rpm in the calm. I didn't push it to hull speed, since this was the first time the engine had run in 6 months.
The air wasn't light enough on our day-sail to get any sense of lessened drag.
I didn't notice any delay in blade engagement when jockeying between forward and reverse when docking. It seemed more responsive than a conventional 2-blade.
-- Karl
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